Cincinnati Reds

Within days after losing his college eligibility, Dubuc signed with the Cincinnati Reds.^[5] On June 25, 1908, Dubuc made his major league debut for the Reds. He gave up five earned runs in 3+1⁄3 innings and, adding injury to insult, sustained a knee injury and had to be carried off the field.^[7] He returned to the mound as a relief pitcher two weeks later on July 12 and allowed only one hit in four innings.^[8] He also pitched a complete-game shutout over the 1908 World Series champion Chicago Cubs team on September 7, 1908.^[9] In all, Dubuc appeared in 15 games for the 1908 Reds, nine as a starter, and compiled a 5–6 record and a 2.74 ERA.^[1] He also traveled with the Reds to Cuba after the 1908 season and won three of four exhibitions games he started on that trip.^[5]

In 1909, Dubuc was slowed after contracting malaria.^[5] He appeared in 11 games for the 1909 Reds, two as a starter, and compiled a 2–5 record with a 3.66 ERA.^[1]

Buffalo and Montreal

On November 3, 1909, the Reds sold Dubuc to the Buffalo Bisons of the Eastern League.^[10] He was then acquired by the Montreal Royals where he remained through the 1911 season. He compiled a 21–11 record with Montreal in 1911.^[11]

Detroit Tigers

On September 1, 1911, after Dubuc's strong performance during the 1911 season, the Detroit Tigers selected Dubuc in the Major League Baseball draft.^[12] Dubuc signed with the Tigers in January 1912 after some wrangling over salary with Tigers owner Frank Navin.^[13][14] Dubuc became part of the Tigers' starting rotation for five consecutive years from 1912 to 1916. In five seasons with Detroit, Dubuc was 72–60 with 90 complete games.^[1]

In 1912, Dubuc appeared in 37 games, 26 as a starter, and compiled a 17–10 record with a 2.77 ERA and a .269 batting average. He ranked among the American League leaders with a .630 winning percentage (eighth), and 23 complete games (ninth). However, lack of control also placed him among the league leaders with 16 wild pitches (first) and 109 bases on balls (second).^[1]

In 1913, he had another strong year, appearing in 36 games, 28 as a starter, and compiling a 15–14 record with a 2.89 ERA. He was arguably the best fielding pitcher in the American League in 1913 with a 4.56 range factor per nine innings pitched (best in the American League), 107 assists (second in the league among pitchers) and 16 putouts (third in the league). He also led the league for the second consecutive year in wild pitches with 13 and ranked fourth with 91 bases on balls.^[1]

He remained with the Tigers for another three years, going 12–14 with a 3.46 ERA in 1914, 17–12 with a 3.21 ERA in 1915, and 10–10 with a 2.96 ERA in 1916.^[1]

Salt Lake City

On January 16, 1917, the Tigers released Dubuc to the Salt Lake City Bees of the Pacific Coast League.^[15][16] He compiled a 22–16 record a in 1917 and a 3.18 ERA in 42 games for Salt Lake in 1917.^[11] The following year, he went 9–9 with a 3.60 ERA in 19 games for Salt Lake.^[11] He also played in the outfield for Salt Lake in 1918 with a .303 batting average.^[11][17]

Boston and New York

In late July 1918, he signed with the Boston Red Sox.^[17] He appeared in only two games for the Red Sox, compiling an 0–1 record with a 4.22 ERA.^[1]

On April 7, 1919, the Red Sox returned Dubuc to Salt Lake.^[18] Two weeks later, on April 23, the New York Giants bought Dubuc from Salt Lake.^[19] He appeared in 36 games, 33 as a relief pitcher, for the 1919 Giants and compiled a 6–4 record with a career low 2.66 ERA.^[1] Despite the strong performance, Dubuc was released by John McGraw of the Giants after the 1919 season. McGraw later stated publicly that he released Dubuc because he "constantly associated" with Sleepy Bill Burns, a gambler who played with Dubuc on the 1912 Tigers and was a central figure in the Black Sox Scandal.^[20]

Minor leagues

Although his major league career ended in 1919, Dubuc continued to play in the minor leagues for the Toledo Mud Hens of the American Association in 1920 and the Syracuse Stars of the International League in 1922 and 1923.^[11] During the 1921 season, with his role in the Black Sox Scandal under review, Dubuc played semi-pro baseball in Montreal in the Atwater Twi-Light League and the Montreal City Baseball League.^[21]

In 1924, Dubuc organized an Ottawa baseball team, called the Ottawa Aces, as part of the Ontario–Quebec–Vermont League.^[22][23][24] He also served as the team's player-manager in the 1924 season. He compiled a 2–2 record and a .286 batting average for Ottawa in 1924.^[11]

In 1925, he was hired as the manager of the Manchester, New Hampshire, team in the Boston Twilight League.^[25] Dubuc was a player-manager for Manchester, making an occasional appearance as a pitcher.^[26] He remained as player-manager of the Manchester in 1926 as it transitioned into the New England League, which was revived for the 1926 season.^[27] At age 37, he appeared in 10 games as a pitcher and compiled a 2–2 record with a 2.00 ERA. He also batted .311 in 61 at bats.^[11]

Chicago Black Sox Scandal

During the 1920 investigation into the Black Sox Scandal, evidence was discovered showing that Sleepy Bill Burns had advised Dubuc that the 1919 World Series had been fixed and that Dubuc should, therefore, bet on the Cincinnati Reds. Dubuc was neither a participant nor a conspirator in the scandal, but was pursued for his "guilty knowledge" of the fix. Sources are in conflict as to whether or not Dubuc was banned from baseball as a result of the investigation.^{[28][29][30][31]}