Overview

Six of King's Grand Slam singles titles were at Wimbledon, four were at the U.S. Championships/Open, one was at the French Open, and one was at the Australian Championships. King reached the final of a Grand Slam singles tournament in 16 out of 25 attempts and had a 12–4 win–loss record in those finals. In the nine tournaments that she failed to reach the final, she was a losing semi-finalist twice and a losing quarter finalist five times. From 1971 through 1975, she won seven of the ten Grand Slam singles tournaments she played. She won the last seven Grand Slam singles finals she contested, six of them in straight sets and four of them against Evonne Goolagong. All but one of her Grand Slam singles titles were on grass.

King's Grand Slam record from 1966 through 1975 was comparable to that of Margaret Court, her primary rival during these years. One or both of these women played 35 of the 40 Grand Slam singles tournaments held during this period, and together they won 24 of them. During this period, Court won 31 of her career 64 Grand Slam titles, including 12 of her 24 Grand Slam singles titles, 11 of her 19 Grand Slam women's doubles titles, and eight of her 21 Grand Slam mixed doubles titles. Court reached the final of a Grand Slam singles tournament in 14 out of 25 attempts and had a 12–2 win–loss record in those finals. Court won seven of the 12 Grand Slam finals she played against King during these years, including 2–1 in singles finals, 4–1 in women's doubles finals, and 1–3 in mixed doubles finals.

King was the year-ending World No. 1 in six of the ten years from 1966 through 1975. She was the year-ending World No. 2 in three of those years and the World No. 3 in the other year.

King won 97 of her career 129 singles titles during this period and was the runner-up in 36 other tournaments.

1966

From left to right: the United States national team tenniswomen Carole Caldwell Graebner, Julie Heldman and Billie Jean King in Turin, Italy, holding the Federations Cup 1966 won against West Germany women's national tennis team

In 1966, King defeated Dorothy "Dodo" Cheney (then 49 years old) for the first time in five career matches, winning their semi-final at the Southern California Championships 6–0, 6–3. King also ended her nine-match losing streak to Margaret Court by defeating her in the final of the South African Tennis Championships. She also won the women's singles in the Ojai Tennis Tournament.^[43] At the Wightman Cup just before Wimbledon, King defeated Virginia Wade and Ann Haydon-Jones. After thirteen unsuccessful attempts to win a Grand Slam singles title from 1959 through 1965, King at the age of 22 finally won the first of her six singles titles at Wimbledon and the first of twelve Grand Slam singles titles overall, defeating Court in the semi-finals 6–3, 6–3 and Maria Bueno in the final. King credited her semi-final victory to her forehand down the line, a new shot in her repertoire.^[41] She also said that the strategy for playing Court is, "Simple. Just chip the ball back at her feet."^[44] At the U.S. Championships, an ill King was upset by Kerry Melville in the second round.^[45]

1967

King successfully defended her title at the South African Tennis Championships in 1967, defeating Maria Bueno in the final. She played the French Championships for the first time in her career,^[46] falling in the quarterfinals to Annette Van Zyl of South Africa. At the Federation Cup one week later in West Germany on clay, King won all four of her matches, including victories over DuPlooy, Ann Haydon-Jones, and Helga Niessen. King then successfully switched surfaces and won her second consecutive Wimbledon singles title, defeating Virginia Wade in the quarterfinals 7–5, 6–2 and Jones. At the Wightman Cup, King again defeated Wade and Jones. King won her second Grand Slam singles title of the year when she won the U.S. Championships for the first time and without losing a set, defeating Wade, Van Zyl, Françoise Dürr, and Jones in consecutive matches. Jones pulled her left hamstring muscle early in the final and saved four match points in the second set before King prevailed.^[47] King won the singles, women's doubles, and mixed doubles titles at both Wimbledon and the U.S. Championships, the first woman to do that since Alice Marble in 1939.^[48] King then returned to the Australian summer tour in December for the first time since 1965, playing seven events there and Judy Tegart in six of those events (winning four of their matches). King lost in the quarterfinals of the New South Wales Championships in Sydney to Tegart after King injured her left knee in the second game of the third set of that match.^[49] However, King won the Victorian Championships in Melbourne the following week, defeating Dalton, Reid, and Lesley Turner in the last three rounds. At a team event in Adelaide, King won all three of her singles and doubles matches to help the U.S. defeat Australia 5–1. To finish the year, King lost to Tegart in the final of the South Australian Championships in Adelaide.

1968

In early 1968, King won three consecutive tournaments to end her Australian tour. In Perth, King won the Western Australia Championships, defeating Margaret Court in the final. In Hobart, King won the Tasmanian Championships by defeating Judy Tegart-Dalton in the final. King then won the Australian Championships for the first time, defeating Dalton in the semi-finals and Court in the final. King continued to win tournaments upon her return to the United States, winning three indoor tournaments before Nancy Richey Gunter defeated King in the semi-finals of the Madison Square Garden Challenge Trophy amateur tournament in New York City before 10,233 spectators.^[50] The match started with Gunter taking a 4–2 lead in the first set, before King won 9 of the next 10 games. King served for the match at 5–1 and had a match point at 5–3 in the second set; however, she lost the final 12 games and the match 4–6, 7–5, 6–0.^[51] King then won three consecutive tournaments in Europe before losing to Ann Haydon-Jones in the final of a professional tournament at Madison Square Garden. Playing the French Open for only the second time in her career and attempting to win four consecutive Grand Slam singles titles (a "non-calendar year Grand Slam"), King defeated Maria Bueno in a quarterfinal before losing to Gunter in a semi-final 2–6, 6–3, 6–4. King rebounded to win her third consecutive Wimbledon singles title, defeating Jones in the semi-finals and Dalton in the final. At the US Open, King defeated Bueno in a semi-final before being upset in the final by Virginia Wade. On September 24, she had surgery to repair cartilage in her left knee^[52] and did not play in tournaments the remainder of the year. King said that it took eight months (May 1969) for her knee to recover completely from the surgery.^[53] In 1977, King said that her doctors predicted in 1968 that her left knee would allow her to play competitive tennis for only two more years.^[54]

1969

King participated in the 1969 Australian summer tour for the second consecutive year. Unlike the previous year, King did not win a tournament. She lost in the quarterfinals of the Tasmanian Championships and the semi-finals of the New South Wales Championships. At the Australian Open, King defeated 17-year-old Evonne Goolagong in the second round 6–3, 6–1 and Ann Haydon-Jones in a three-set semi-final before losing to Margaret Court in a straight-sets final. The following week, King lost in the semi-finals of the New Zealand Championships. Upon her return to the United States, King won the Pacific Coast Pro and the Los Angeles Pro. King then won two tournaments in South Africa, including the South African Open. During the European summer clay court season, King lost in the quarterfinals of both the Italian Open and the French Open. On grass at the Wills Open in Bristol, United Kingdom, King defeated Virginia Wade in the semi-finals (6–8, 11–9, 6–2) before losing to Court. At Wimbledon, King lost only 13 points while defeating Rosemary Casals in the semi-finals 6–1, 6–0;^[55] however, Jones upset King in the final and prevented King from winning her fourth consecutive singles title there. The week after, King again defeated Wade to win the Irish Open for the second time in her career. In the final Grand Slam tournament of the year, King lost in the quarterfinals of the US Open to Nancy Richey Gunter 6–4, 8–6. This was the first year since 1965 that King did not win at least one Grand Slam singles title. King finished the year with titles at the Pacific Southwest Open in Los Angeles, the Stockholm Indoors, and the Midland (Texas) Pro. She said during the Pacific Southwest Open, "It has been a bad year for me. My left knee has been OK, but I have been bothered by a severe tennis elbow for seven months. I expect to have a real big year in 1970, though, because I really have the motivation now. I feel like a kid again."^[56]

1970

Billie Jean King in 1970

In 1970, Margaret Court won all four Grand Slam singles tournaments and was clearly the World No. 1. King lost to Court three times in the first four months of the year, in Philadelphia, Dallas, and Johannesburg (at the South African Open). Court, however, was not totally dominant during this period as King defeated her in Sydney and Durban, South Africa. Where Court dominated was at the Grand Slam tournaments. King did not play the Australian Open. King had leg cramps and lost to Helga Niessen Masthoff of West Germany in the quarterfinals of the French Open 2–6, 8–6, 6–1.^[57] At Wimbledon, Court needed seven match points^[58] to defeat King in the final 14–12, 11–9 in one of the greatest women's finals in the history of the tournament.^[59] On July 22,^[60] King had right knee surgery, which forced her to miss the US Open. King returned to the tour in September, where she had a first round loss at the Virginia Slims Invitational in Houston and a semi-final loss at the Pacific Coast Championships in Berkeley, California. To close out the year, King in November won the Virginia Slims Invitational in Richmond, Virginia and the Embassy Indoor Tennis Championships in London. During the European clay court season, King warmed-up for the French Open by playing in Monte Carlo (losing in the semi-finals), winning the Italian Open (saving three match points against Virginia Wade in the semi-finals),^[61] playing in Bournemouth (losing to Wade in the quarterfinals), and playing in Berlin (losing to Masthoff in the semi-finals). The Italian Open victory was the first important clay court title of King's career. Along the way, she defeated Masthoff in a three-set quarterfinal and Wade in a three-set semi-final, saving two match points at 4–5 in the second set. The twelfth game of that set (with King leading 6–5) had 21 deuces and lasted 22 minutes,^[62] with Wade saving seven set points and holding sixteen game points before King won. In Wightman Cup competition two weeks before Wimbledon but played at the All England Club, King defeated both Wade and Ann Haydon-Jones in straight sets. Many things bothered King concerning her advocacy for women's rights in sports. Among these concerns, she sought better pay for female tennis players, given the substantial differences in budgets between male and female players. In September 1970, there was the Pacific Southwest Open which was a tennis tournament. The prize money for men and women varied significantly, with the top prize for men being $12,500 and for women, a mere $1,500. Women's expenses were not covered unless they made the quarterfinals. This had bothered King and was the final straw for her. King and other 8 women did not play because of the budgets which they were willing to take the risk of expulsion from the U.S. Lawn Tennis Association. King and the other women organized a women- Houston Virginia Slims invitational and this helped launch the series of women only tournaments.^[63]

1971

Although King won only one Grand Slam singles title in 1971, this was the best year of her career in terms of tournaments won (17). According to the International Tennis Hall of Fame, she played in 31 singles tournaments and compiled a 112–13 win–loss record.^[32]

She started the year by winning eight of the first thirteen tournaments she played, defeating Rosemary Casals in seven finals. King's five losses during this period were to Françoise Dürr (twice), Casals (once), Ann Haydon-Jones (once), and Chris Evert (in St. Petersburg). At the time, King said that retiring from the match with Evert after splitting the first two sets was necessary because of leg cramps. But in early 1972, King admitted that cramps associated with an abortion caused the retirement.^[64]

At the tournament in early May at Hurlingham, United Kingdom, King lost a second round match to an old rival, Christine Truman Janes (now 30 years old), 6–4, 6–2; but King recovered the next week to win the German Open in Hamburg on clay. Four weeks later at the Queen's Club tournament in London, King played Margaret Court for the first time in 1971, losing their final. At Wimbledon, King defeated Janes in the fourth round (6–2, 7–5) and Durr in the quarterfinals before losing unexpectedly to Evonne Goolagong in the semi-finals 6–4, 6–4. Two weeks after Wimbledon, King won the Rothmans North of England Championships on grass in Hoylake, United Kingdom, beating Virginia Wade, Court, and Casals in the last three rounds. She then played two clay court tournaments in Europe, winning neither, before resuming play in the United States.

In August, King won the indoor Houston tournament and the U.S. Women's Clay Court Championships in Indianapolis. King then switched back to grass and won the US Open without losing a set, defeating Evert in the semi-finals (6–3, 6–2) and Casals in the final. King then won the tournaments in Louisville, Phoenix, and London (Wembley Pro). King and Casals both defaulted at 6–6 in the final of the Pepsi Pacific Southwest Open in Los Angeles in September when their request to remove a lineswoman was denied, eventually resulting in the United States Lawn Tennis Association fining both players US$2,500.^[65] To end the year, King played two tournaments in New Zealand but did not win either. She lost in Christchurch to Durr and in Auckland to Kerry Melville Reid. In 1971, King was the first female tennis player to earn $100,000 a year. Being one of her greatest accomplishments, this earned her congratulatory phone call from President Richard M. Nixon.^[63]

1972

King won three Grand Slam singles titles in 1972, electing not to play the Australian Open despite being nearby when she played in New Zealand in late 1971. King said, "I was twenty-eight years old, and I was at the height of my powers. I'm quite sure I could have won the Grand Slam [in] ... 1972, but the Australian was such a minor-league tournament at that time.... More important, I did not want to miss any Virginia Slims winter tournaments. I was playing enough as it was."^[66] Her dominance was aided by rival Margaret Court's absence from the tour due to childbirth during most of the 1972 season.

At the beginning of the year, King failed to win eight of the first ten tournaments she played. She won the title in San Francisco in mid-January. But then King lost in Long Beach to Françoise Dürr (although King claimed in her 1982 autobiography that she intentionally lost the match because of an argument with her husband^[67]) and in Fort Lauderdale on clay to Chris Evert 6–1, 6–0. The inconsistent results continued through mid-April, in Oklahoma City (losing in the quarterfinals); Washington, D.C. (losing in the second round); and Dallas (losing to Nancy Richey Gunter after defeating Evert in the quarterfinals 6–7(4–5), 6–3, 7–5 and Evonne Goolagong in the semi-finals 1–6, 6–4, 6–1).^[68] King won the title in Richmond; however, one week later, King lost in the semi-finals of the tournament in San Juan. This was followed in successive weeks by a loss in the Jacksonville final to Marie Neumannová Pinterová and in a St. Petersburg semi-final to Evert (6–2, 6–3).

King did not lose again until mid-August, winning six consecutive tournaments. She won the tournaments in Tucson and Indianapolis. King then won the French Open without losing a set and completed a career Grand Slam. She defeated Virginia Wade in the quarterfinals, Helga Niessen Masthoff in the semi-finals, and Goolagong in the final.^[69] On grass, King then won the Wimbledon warm-up tournaments in Nottingham and Bristol and won Wimbledon itself for the fourth time. She lost only one set during the tournament, to Wade in the quarterfinals. That was followed by straight set wins over Rosemary Casals and Goolagong. When the tour returned to the United States, King did not win any of the three tournaments she played before the US Open, including a straight sets loss to Margaret Court in Newport. At the US Open, however, King won the tournament without losing a set, including a quarterfinal win over Wade, a semi-final defeat of Court, and a final win over Kerry Melville Reid. King finished the year by winning the tournaments in Charlotte and Phoenix (defeating Court in the final of both), a runner-up finish in Oakland (losing to Court), and a semifinal finish at the year-end championships in Boca Raton (losing to Evert).

1973

The dress worn by King in 1973 during the Battle of the Sexes match. The National Museum of American History

1973 was Margaret Court's turn to win three Grand Slam singles titles, failing to win only Wimbledon, and was the clear world No. 1 for the year; this was her first full season since winning the Grand Slam in 1970, as she had missed significant portions of 1971 and 1972 due to childbirth. As during the previous year, King started 1973 inconsistently. She missed the first three Virginia Slims tournaments in January because of a wrist injury.^[70] She then lost in the third round at the Virginia Slims of Miami tournament but won the Virginia Slims of Indianapolis tournament, defeating Court in the semi-finals 6–7, 7–6, 6–3 and Rosemary Casals in the final. The semi-final victory ended Court's 12-tournament and 59-match winning streaks,^[71] with King saving at least three match points when down 5–4 (40–0) in the second set. Indianapolis was followed by five tournaments that King failed to win (Detroit, Boston, Chicago, Jacksonville, and the inaugural Family Circle Cup in Hilton Head, South Carolina). King lost to Court in two of those tournaments. After deciding not to defend her French Open singles title, King won four consecutive tournaments, including her fifth Wimbledon singles title when she defeated Kerry Melville Reid in the quarterfinals, Evonne Goolagong in the semi-finals on her eighth match point,^[72] and Chris Evert in the final. King lost only nine points in the 6–0 bageling of Evert in the first set of their final.^[73]

King also completed the Triple Crown at Wimbledon (winning the singles, women's doubles, and mixed doubles titles in the same year), thus becoming the first, and only, player to do so at Wimbledon in the Open Era. In none of the preceding tournaments, however, did King play Court. Their rivalry resumed in the final of the Virginia Slims of Nashville tournament, where Court won for the third time in four matches against King in 1973. (This was the last ever singles match between those players, with Court winning 21 and King 13 of their 34 matches.) Three weeks later at the US Open, King retired from her fourth-round match with Julie Heldman while ill^[74] and suffering from the oppressive heat and humidity. When Heldman complained to the match umpire that King was taking too long between games, King reportedly told Heldman, "If you want the match that badly, you can have it!"^[75] The Battle of the Sexes match against Bobby Riggs was held in the middle of the Virginia Slims of Houston tournament. King won her first and second round matches three days before playing Riggs, defeated Riggs, won her quarterfinal match the day after the Riggs match, and then lost the following day to Casals in the semifinals 7–6, 6–1. According to King, "I had nothing left to give."^[76] To end the year, King won tournaments in Phoenix, Hawaii, and Tokyo and was the runner-up in Baltimore.

Battle of the Sexes

Main article: Battle of the Sexes (tennis)

Billie Jean King and Bobby Riggs in 1973

In 1973, King defeated Bobby Riggs in an exhibition match, winning $100,000 ($670,520 in 2022 terms).

Riggs had been a top men's player in the 1930s and 1940s in both the amateur and professional ranks. He won the Wimbledon men's singles title in 1939, and was considered the World No. 1 male tennis player for 1941, 1946, and 1947. He then became a self-described tennis "hustler" who played in promotional challenge matches. Claiming that the women's game was so inferior to the men's game that even a 55-year-old like himself could beat the current top female players, he challenged and defeated Margaret Court 6–2, 6–1. King, who previously had rejected challenges from Riggs, then accepted a lucrative financial offer to play him for $100,000 in a winner-takes-all match.

Dubbed "the Battle of the Sexes", the Riggs–King match took place at the Houston Astrodome in Texas on September 20, 1973. The match garnered huge publicity. In front of 30,492 spectators and a television audience estimated at 50 million people (U.S.), and 90 million in 37 countries, 29-year-old King beat the 55-year-old Riggs 6–4, 6–3, 6–3. The match is considered a significant event in developing greater recognition and respect for women's tennis. King said, "I thought it would set us back 50 years if I didn't win that match. It would ruin the women's tour and affect all women's self-esteem,"^[77] and that "to beat a 55-year-old guy was no thrill for me. The thrill was exposing a lot of new people to tennis."^[78]

1974

King won five of the first seven tournaments she contested in 1974. She won the Virginia Slims of San Francisco, defeating Nancy Richey Gunter in the semi-finals and Chris Evert in the final. The following week in Indian Wells, California, King again defeated Gunter in the semi-finals but lost to Evert in the final. King then won tournaments in Fairfax, Virginia and Detroit before losing a semi-final match to Virginia Wade in Chicago. King won both tournaments she played in March, defeating Gunter in the Akron, Ohio final and Evert at the U.S. Indoor Championships final. Olga Morozova then upset King in her next two tournaments, at Philadelphia in the final and at Wimbledon in a quarterfinal 7–5, 6–2. Afterward, King did not play a tour match until the US Open, where she won her fourth singles title and third in the last four years. She defeated Rosemary Casals in a straight sets quarterfinal, avenged in the semi-finals her previous year's loss to Julie Heldman, and narrowly defeated Evonne Goolagong in the final. King did not reach a tournament final during the remainder of the year, losing to Heldman in an Orlando semi-final, Wade in a Phoenix semi-final, and Goolagong in a semi-final of the tour-ending Virginia Slims Championships in Los Angeles.

1975

In 1975, King played singles only half the year, as she retired (temporarily, as it turned out) from tournament singles competition immediately after winning her sixth Wimbledon singles title.

She began the year in San Francisco, defeating Françoise Dürr and Virginia Wade before losing to Chris Evert in the final. The following week, King won the Sarasota, Florida tournament, defeating Evert in the final 6–3, 6–2. Evert said immediately after the final, which was her thirteenth career match with King, "I think that's the best that Billie Jean has ever played. I hit some great shots but they just kept coming back at me."^[79] Looking back at that match, King said, "I probably played so well because I had to, for the money. Out of frustration comes creativity. Right?"^[80] Two months later, Wade defeated King in the semi-finals of the Philadelphia tournament. At the Austin, Texas, tournament in April, King defeated Evonne Goolagong 6–1, 6–3 before losing to Evert in the final. As King was serving for the match at 6–5 in the third set, a disputed line call went in Evert's favor. King said after the match that she was cheated out of the match and that she had never been angrier about a match.^[81]

King played only one of the Wimbledon warm-up tournaments, defeating Olga Morozova in the Eastbourne semi-finals before losing to Wade in the final. Seeded third at Wimbledon, King defeated seventh seeded Morozova in the quarterfinals (6–3, 6–3) and then top seeded Evert in the semi-finals (2–6, 6–2, 6–3) after being down 3–0 (40–15) in the final set.^[82] Evert blamed her semifinal defeat on a loss of concentration when she saw Jimmy Connors, her former fiancé, escorting Susan George into Centre Court. King, however, believes that the match turned around because King planned for and totally prepared for Wimbledon that year and told herself when she was on the verge of defeat, "Hey, Billie Jean, this is ridiculous. You paid the price. For once, you looked ahead. You're supposed to win. Get your bahoola in gear."^[82] King then defeated fourth seeded Goolagong Cawley in the second most lopsided women's final ever at Wimbledon (6–0, 6–1). King called her performance a "near perfect match" and said to the news media, "I'm never coming back."^[83]

1976

Except for five Federation Cup singles matches that she won in straight sets in August, King played only in doubles and mixed doubles events from January through September. She partnered Phil Dent to the mixed doubles title at the US Open. She lost to Dianne Fromholtz Balestrat in both of the singles tournaments she played the remainder of the year. Looking back, King said, "I wasted 1976. After watching Chris Evert and Evonne [Goolagong] Cawley play the final at Wimbledon I asked myself what I was doing. So, despite my age and the operations, the Old Lady came back...."^[84] King had knee surgery for the third time on November 9,^[85] this time on her right knee,^[86] and did not play the remainder of the year.

1977

King spent the first three months of the year rehabilitating her right knee after surgery in November 1976.^[87]

In March 1977, King requested that the Women's Tennis Association (WTA) exercise its right to grant a wild card entry to King for the eight-player Virginia Slims Championships at Madison Square Garden in New York City. Margaret Court, who finished in sixth place on the Virginia Slims points list, had left the tour due to her fourth pregnancy and thus failed to qualify for the tournament because she did not play enough Virginia Slims tournaments leading up to the championships. This left a spot open in the draw, which the WTA filled with Mima Jaušovec. King then decided to play the Lionel Cup tournament in San Antonio, Texas, which the WTA harshly criticized because tournament officials there had allowed Renée Richards, a transgender athlete, to enter.^[88] Chris Evert, Martina Navratilova, and Betty Stöve (president of the WTA) criticized King's decision because of Richards's unresolved and highly controversial status on the women's tennis tour. Evert said she was disappointed with King and that until Richards's status was resolved, "all of the women should stick together." Navratilova said, "Billie Jean is a bad girl pouting. She made a bad decision. She's mad because she could not get what she wanted." Stöve said that if King had wanted the competition, "[T]here are plenty of men around here she could've played with. She didn't have to choose a 'disputed' tournament."^[89] The draw in San Antonio called for King to play Richards in the semi-finals had form held; however, Richards lost in the quarterfinals. King eventually won the tournament.

At the clay court Family Circle Cup in late March, King played for the last time her long-time rival Nancy Richey Gunter in the first round. King won 0–6, 7–6, 6–2. She defeated another clay court specialist, Virginia Ruzici, in the second round before winning only one game from Evert in the final.

At Wimbledon in the third round, King played Maria Bueno for the last time, with King winning 6–2, 7–5. In the quarterfinals, Evert defeated King for the first time at a Grand Slam singles tournament and for the first time on grass 6–1, 6–2 in just 46 minutes. Evert said it was the best match she had ever played on grass up to that point in her career,^[90] and King said, "No excuses. Let's forget knees, ankles, toes, everything else. She just played beautiful tennis. I don't think many players would've beaten her today."^[91] King also said after the match, "Maybe I can be happy being number eight instead of number one. At this stage, just playing, that's winning enough for me."^[92] But when asked about retirement, King said, "Retire? Quit tournament tennis? You gotta be kidding. It just means I've got a lot more work. I've got to make myself match tough ... mentally as well as physically. I gotta go out and kill myself for the next six months. It's a long, arduous process. I will suffer. But I will be back."^[93] There was a small historic note at Wimbledon 1977 in that it was the first time ever that King competed at the championships that she did not reach a final. From her debut in 1961 until 1976, she had played in the final of one of the three championship events for women every year. Perhaps there was irony in this in that as the Wimbledon champion with the most titles in its history, the event was celebrating its centenary in the year King failed to make a final for the first time. The only other years she competed at the championship and did not feature in a final were 1980 and 1982. In her entire Wimbledon career of 22 competitions, King never failed to be a semi-finalist in at least one event every year.^[94]

Evert repeated her Wimbledon quarterfinal victory over King at the clay court US Open, winning 6–2, 6–0. This loss prompted King to say, "I better get it together by October or November or that's it. I'll have to make some big decisions. I'm not 20-years-old and I can't just go out and change my game. It's only the last four weeks I haven't been in [knee] pain. [But if] I keep using that as a copout, I shouldn't play."^[95]

The remainder of the year, King's win–loss record was 31–3, losing only to Evert, Dianne Fromholtz Balestrat, and Michelle Tyler. King won five of the eight tournaments she entered plus both of her Wightman Cup matches. She defeated Navratilova all four times they played, including three times in three consecutive weeks, and beat Wimbledon champion Virginia Wade twice. Beginning September 26, King played seven consecutive weeks. She lost to Tyler in the second round in Palm Harbor, Florida and Fromholtz Balestrat in the semi-finals in Atlanta. She then won three hard court tournaments in three consecutive weeks. She defeated Navratilova and Wendy Turnbull to win in Phoenix, losing only four points to Turnbull in the third set of the final.^[96] The next week, she defeated Navratilova, Fromholtz Balestrat, and Wimbledon runner-up Stöve to win in São Paulo. The third week, she defeated Ruzici, Stöve, and Janet Newberry Wright to win in San Juan. In November, Evert snapped King's 18-match winning streak in the final of the Colgate Series Championships in Mission Hills, California. King then won her Wightman Cup matches, defeated Navratilova to win the tournament in Japan, and beat Wade to win the Bremar Cup in London. King said, "I have never had a run like this, even in the years when I was Wimbledon champion. At 34, I feel fitter than when I was 24."^[97]

1978

King in 1978 photographed by Lynn Gilbert (1978)

King played ten singles tournaments during the first half of 1978, limiting herself to doubles after Wimbledon.

To start the year, King was the runner-up in Houston and Kansas City (losing to Martina Navratilova in both) and in Philadelphia (losing to Chris Evert). At the Virginia Slims Championships, King lost her first round robin match to Virginia Wade and defaulted her two remaining round robin matches because of a leg injury sustained during the first match.

At Wimbledon, King played with a painful heel spur in her left foot and lost to Evert in the quarterfinals for the second consecutive year 6–3, 3–6, 6–2. The match was on-serve in the third set with King serving at 2–3 (40–0) before Evert won five consecutive points to break serve. King won a total of only two points during the last two games. King said after the match, "I don't think my mobility is very good and that's what I need to beat her. Physically, she [Evert] tears your guts apart unless you can stay with her. I'm really disappointed. I really wanted to play well. I just couldn't cut it because of my heel."^[98] King and her partner Ray Ruffels lost in the final of mixed doubles in straight sets.

King teamed with Navratilova to win the women's doubles title at the US Open, King's fourth women's doubles title at that tournament and fourteenth Grand Slam women's doubles title overall. To end the year, King was undefeated in five doubles matches (four with Evert and one with Rosemary Casals) as the U.S. won the Federation Cup in Melbourne, Australia. She also teamed with Tracy Austin in the 1978 Wightman Cup against Great Britain, beating Anne Hobbs & Sue Mappin in the best of seven rubbers, despite the US losing the Cup 3–4. During the Federation Cup competition, King hinted at retirement from future major singles competitions and said that she was "sick and tired of continued surgery" in trying to get fit enough for those events.^[99] Nevertheless, King had foot surgery on December 22 in an attempt to regain mobility for a return to the tennis tour.^[100]

1979

During the first half of 1979, King played only one event – doubles in the Federation Cup tie against Spain – because of major surgery to her left foot during December 1978.

King returned to singles competition at the Wimbledon warm-up tournament in Chichester. She defeated the reigning Wimbledon champion, Martina Navratilova, in a 48-minute quarterfinal 6–1, 6–2^[101] before losing to Evonne Goolagong Cawley in the semi-finals 1–6, 6–4, 10–8. Seeded seventh at Wimbledon, King defeated Hana Mandlíková in the fourth round before losing the last six games^[102] of the quarterfinal match with fourth-seeded Tracy Austin 6–4, 6–7(5), 6–2. King partnered with Navratilova at Wimbledon to win King's 20th and final Wimbledon title, breaking Elizabeth Ryan's longstanding record of 19 Wimbledon titles just one day after Ryan collapsed and died at Wimbledon.^[103]

At the US Open, the ninth-seeded King reached the quarterfinals without dropping a set, where she upset the fourth-seeded Virginia Wade 6–3, 7–6(4). Next up was a semi-final match with the four-time defending champion and top-seeded Chris Evert; however, with King hampered by a neck injury sustained during a bear hug with a friend the day before the match, Evert won 6–1, 6–0, including the last eleven games and 48 of the last 63 points.^[104] This was Evert's eighth consecutive win over King, with Evert during those matches losing only one set and 31 games and winning four 6–0 sets.^[104] Evert said after the match, "Psychologically, I feel very confident when I ... play her."^[104]

The following week in Tokyo, King won her first singles title in almost two years, defeating Goolagong Cawley in the final. In November in Stockholm, King defeated Betty Stöve in the final after Stöve lost her concentration while serving for the match at 5–4 in the third set.^[105] Three weeks later in Brighton, King lost a semi-final match with Navratilova 7–5, 0–6, 7–6(3) after King led 6–5 in the third set.^[106] She ended the year with a quarterfinal loss in Melbourne (not the Australian Open), a second round loss in Sydney, and a three-set semi-final loss to Austin in Tokyo.

1980–1981

King won the tournament in Houston that began in February, snapping Martina Navratilova's 28-match winning streak in the straight-sets final.^[107]

At the winter series-ending Avon Championships in March, King defeated Virginia Wade in her first round robin match 6–1, 6–3. After Wade held serve at love to open the match, King won nine consecutive games and lost only nine points during those games.^[107] King then lost her second round robin match to Navratilova and defeated Wendy Turnbull in an elimination round match, before losing to Tracy Austin in the semi-finals

King played the 1980 French Open, her first time since she won the event in 1972 and completed a career singles Grand Slam. She was seeded second but lost in the quarterfinals to fifth-seeded Dianne Fromholtz Balestrat of Australia.^[108]

At Wimbledon, King defeated Pam Shriver in a two-hour, forty minute fourth round match after King saved a match point in the second set and recovered from a 4–2 (40–0) deficit in the third set with Shriver serving.^[109] In a quarterfinal that took two days to complete, King lost to two-time defending champion and top-seeded Navratilova 7–6, 1–6, 10–8. The beginning of the match was delayed until late afternoon because of rain. Because she wore glasses, King agreed to start the match then on condition that tournament officials immediately suspend the match if the rain resumed. During the first set, drizzle began to fall; however, the chair umpire refused to suspend the match. King led in the tiebreaker 5–1 before Navratilova came back to win the set, whereupon the umpire then agreed to the suspension. When the match resumed the next day, King won 20 of the first 23 points to take a 5–0 lead in the second set and lost a total of seven points while winning the set in just 17 minutes. In the third set, Navratilova broke serve to take a 2–0 lead before King broke back twice and eventually served for the match at 6–5. King then hit four volley errors, enabling Navratilova to break serve at love and even the match. King saved three match points while serving at 6–7 and three more match points while serving at 7–8. During the change-over between games at 8–9, King's glasses broke for the first time in her career. She had a spare pair, but they did not feel the same. King saved two match points before Navratilova broke serve to win the match. King said, "I think that may be the single match in my career that I could have won if I hadn't had bad eyes."^{[110][111][112]}

King teamed with Navratilova to win King's 39th and final Grand Slam title at the US Open. Navratilova then decided she wanted a new doubles partner and started playing with Shriver but refused to discuss the change directly with King. She finally confronted Navratilova during the spring of 1981, reportedly saying to her, "Tell me I'm too old ... but tell me something." Navratilova refused to talk about it.^[113]

King had minor knee surgery on November 14 in San Francisco to remove adhesions and cartilage.^[114]

1982–1983

In 1982, King began a comeback, winning the Wimbledon warm-up tournament the 1982 Edgbaston Cup in Birmingham, her first singles title in more than two years. King was 38 years old and the twelfth-seed at Wimbledon. In her third round match with Tanya Harford of South Africa, King was down 7–5, 5–4 (40–0) before Harford's apparent winner was deemed 'not up' by the umpire, something the South African protested vehemently. King then saved the next two match points^[115] to win the second set 7–6(2) and then the third set 6–3. King said in her post-match press conference, "I can't recall the previous time I have been so close to defeat and won. When I was down 4–5 and love–40, I told myself, 'You have been here 21 years, so use that experience and hang on.'"^[116] In the fourth round, King upset sixth-seeded Australian Wendy Turnbull in straight sets. King then upset third-seeded Tracy Austin in the quarterfinals 3–6, 6–4, 6–2 to become the oldest female semi-finalist at Wimbledon since Dorothea Douglass Lambert Chambers in 1920. This was King's first career victory over Austin after five defeats and reversed the result of their 1979 Wimbledon quarterfinal. King said in her post-match press conference, "Today, I looked at the scoreboard when I was 2–0 in the third set and the '2' seemed to be getting bigger and bigger. In 1979, when I was up 2–0 at the same stage, I was tired and didn't have anything left. But today I felt so much better and was great mentally."^[117] Two days later in the semi-finals, which was King's 250th career match at Wimbledon in singles, women's doubles, and mixed doubles,^[118] the second-seeded Chris Evert defeated King on her fifth match point 7–6(4), 2–6, 6–3. King was down a set and 2–1 in the second set before winning five consecutive games to even the match.^[119] King explained that she actually lost the match in the first set by failing to convert break points at 15–40 in the second and fourth games.^[120][121] Having started the year in retirement, King finished 1982 ranked 14 in the world.

In 1983, she reached the semi-finals in her final appearance at Wimbledon, losing to Andrea Jaeger 6–1, 6–1 after beating Kathy Jordan in the quarterfinals, seventh-seeded Wendy Turnbull in the fourth round, and Rosemary Casals, her longtime doubles partner, in the third round. Jaeger claims that she was highly motivated to defeat King because King had defeated Turnbull, a favorite of Jaeger's, and because King refused a towel from an attendant just before her match with Jaeger, explaining, "I'm not going to sweat in this match."

King became the oldest WTA player to win a singles tournament when she won the Edgbaston Cup grass court tournament in Birmingham at 39 years, 7 months and 23 days after a straight-sets victory in the final against Alycia Moulton.^[122] Her tally of 20 Wimbledon titles remained when partnered with Steve Denton and the no.1 seeds in the mixed doubles, they lost 6–7(5–7), 7–6(7–5), 7–5 to John Lloyd & Wendy Turnbull in the final, King being the only player to drop her service in the final game. At her final appearance at the US Open later in 1983, King didn't play singles, but partnered Sharon Walsh in the women's doubles, reaching the semi-finals and Trey Waltke in the mixed doubles, losing in the second round. The final official singles match of King's career was a second round loss to Catherine Tanvier at the 1983 Australian Open.

1984 to present

King played doubles sporadically from 1984 through 1990. She and Vijay Amritraj were seeded sixth for the Wimbledon mixed doubles 1984, but they withdrew before the tournament began. She retired from competitive play in doubles in March 1990. In her last competitive doubles match, King and her partner, Jennifer Capriati, lost a second round match to Brenda Schultz-McCarthy and Andrea Temesvári 6–3, 6–2 at the Virginia Slims of Florida tournament.

King became the captain of the United States Fed Cup team and coach of its women's Olympic tennis squad. She guided the U.S. to the Fed Cup championship in 1996 and helped Lindsay Davenport, Gigi Fernández, and Mary Joe Fernández capture Olympic gold medals.

In 2002, King dismissed Capriati from the Fed Cup team, saying Capriati had violated rules that forbade bringing along and practicing with personal coaches.^[123] Opinion was sharply divided, with many supporting King's decision but many feeling the punishment was too harsh, especially in hindsight when Monica Seles and Lisa Raymond were defeated by lower-ranked Austrians Barbara Schett and Barbara Schwartz. The following year, Zina Garrison succeeded King as Fed Cup captain.

Player compensation

Before the start of the open era in 1968, King earned US$100 a week as a playground instructor and student at California State University, Los Angeles when not playing in major tennis tournaments.^[77]

In 1967, King criticized the United States Lawn Tennis Association (USLTA) in a series of press conferences, denouncing what she called the USLTA's practice of "shamateurism", where top players were paid under the table to guarantee their entry into tournaments. King argued that this was corrupt and kept the game highly elitist. King quickly became a significant force in the opening of tennis to professionalism. King said this about the amateur game:

In America, tennis players are not people. If you are in tennis, you are a cross between a panhandler and a visiting in-law. You're not respected, you're tolerated. In England, you're respected as an artist. In Europe, you're a person of importance. Manuel Santana gets decorated by Franco. The Queen leads the applause. How many times have I been presented at the White House? You work all your life to win Wimbledon and Forest Hills and all the people say is, "That's nice. Now what are you going to do with your life?" They don't ask Mickey Mantle that. Stop 12 people on the street and ask them who Roy Emerson is and they're stuck for an answer, but they know the third-string right guard for the Rams. I'd like to see tennis get out of its "sissy" image and see some guy yell, "Hit it, ya bum" and see it be a game you don't have to have a lorgnette or a sash across your tuxedo to get in to watch.^[124]

Push for female equality

When the open era began, King campaigned for equal prize money in the men's and women's games. In 1971, her husband, Larry King created the idea to form a nine player women's group with the financial backing of World Tennis magazine founder Gladys Heldman and the sponsorship of Virginia Slims chairman Joe Cullman. King became the first woman athlete to earn over US$100,000 in prize money;^[125] however, inequalities continued. King won the US Open in 1972 but received US$15,000 less than the men's champion Ilie Năstase. She stated that she would not play the next year if the prize money was not equal. In 1973, the US Open became the first major tournament to offer equal prize money for men and women.

King led player efforts to support the first professional women's tennis tour in the 1970s called the Virginia Slims, founded by Gladys Heldman and funded by Joseph Cullman of Philip Morris.^[126] Once the tour took flight, King worked tirelessly to promote it even though many of the other top players were not supportive. "For three years we had two tours and because of their governments [Martina] Navratilova and Olga Morozova had to play the other tour. Chris [Evert], Margaret [Court], Virginia [Wade], they let us do the pioneering work and they weren't very nice to us. If you go back and look at the old quotes; they played for the love of the game, we played for the money. When we got backing and money, we were all playing together – I wonder why? I tried not to get upset with them. Forgiveness is important. Our job was to have one voice and win them over."^[127]

In 1973, King became the first president of the women's players union – the Women's Tennis Association. In 1974, she, with husband Larry King and Jim Jorgensen, founded womenSports magazine and started the Women's Sports Foundation.^[128] Also in 1974, World TeamTennis began, founded by Larry King, Dennis Murphy, Frank Barman and Jordan Kaiser.^[129] She became league commissioner in 1982 and major owner in 1984.

King is a member of the Board of Honorary Trustees for the Sports Museum of America,^[130] which opened in 2008. The museum is the home of the Billie Jean King International Women's Sports Center, a comprehensive women's sports hall of fame and exhibit.^[131]

Billie Jean King through her various efforts has been said to have started the second wave of feminism. Not just for women in sports, but for women everywhere, Kings triumphs have led to greater opportunities . For example, it is said that “In a single tennis match, Billie Jean King was able to do more for the cause of women than most feminists can achieve in a lifetime” (Paule-Koba). Kings win against Bobby Riggs, one of the greatest male tennis players of their time, was not just a win for herself, but a win for women everywhere. After Riggs sexist comments leading up to the match, King realized she had a lot more to win the match for then a trophy. “Billie Jean King was the rare athlete who brought together sport and feminism, and, in doing so, she put a human face on the ideals of liberal feminism” (Paule-Koba). Since her win against Riggs, King has started her own tour for women to create equal pay for them, influenced and aided the title IX legislation, and helped create the Women's sports foundation known as womenSports and World Team Tennis.^[132]