2012–2017: Early years

Prior to 2018 Krajicek competed mainly on the ITF Futures and ATP Challenger Tour, both in singles and doubles.

He won his second doubles match (the first was in 2013 with Denis Kudla) at the US Open with partner Jackson Withrow by defeating Philipp Oswald and André Sá in the first round.

2018–2020: First ATP title, top 50 debut

Krajicek reached the quarterfinals of the 2018 US Open doubles tournament partnering Tennys Sandgren, his best showing at a Grand Slam in doubles. He entered the top 50 in doubles reaching a career-high of No. 44 on 22 October 2018. He later reached the top 40 with a career-high of World No. 35 on 27 May 2019.

He reached the third round of the 2020 Australian Open partnering Franko Škugor and the pair also won the title at the 2020 Austrian Open in Kitzbühel.

2021: Masters final, Olympics, new partnership with Dodig

Partnering Vasek Pospisil, he reached his tenth final at the 2021 Hall of Fame Open where he lost to fellow Americans Jack Sock and William Blumberg.

At the Olympics, he reached the semifinals partnering again with Tennys Sandgren where they lost to eventual champions Mate Pavic and Nikola Mektic. The pair lost in the bronze medal match to the New Zealand pair of Marcus Daniell and Michael Venus.

Partnering with Steve Johnson, he reached his first Masters 1000 final at the 2021 Western & Southern Open in Cincinnati, defeating Colombian pair Juan Sebastián Cabal and Robert Farah in a tight three-set match.^[10] The pair last competed at the 2020 edition of the Cincinnati Masters where they reached the semifinals.

With new partner Ivan Dodig, he won the title at the 2022 ATP Lyon Open and reached the final at the 2021 Winston-Salem Open.^[11]

2022: First Major final, American No. 2, world No. 9, ATP finals

At the 2022 French Open, he reached his first Grand Slam final in his career, partnering with Dodig and defeating top seeds Joe Salisbury and Rajeev Ram in the quarterfinals.^[12] They lost to Marcelo Arevalo and Jean Julien Rojer in the final. As a result, he made his debut in the top 25 and became the American No. 2 player after Rajeev Ram.

At the 2022 Halle Open and the 2022 Eastbourne International, he reached the semifinals with Dodig. As a result, he reached the top 20 at World No. 19 in the doubles rankings on 27 June 2022, and a couple of weeks later the top 15 on 11 July 2022.

At the ATP 500 2022 Citi Open, he reached his 15th final, then he reached his 16th at the 2022 Firenze Open defeating Nicolas Mahut and Édouard Roger-Vasselin. At the 2022 Tennis Napoli Cup, he won his second title with Dodig as a team, defeating home favorites Lorenzo Sonego and Andrea Vavassori to reach their fifth final of 2022 and Australian duo Matthew Ebden and John Peers in the final.^[13][14] He reached his third straight and sixth final for the season with Dodig at the ATP 500 2022 Swiss Indoors in Basel, defeating top seeds Arevalo/Rojer and the Kazakhstani duo of Andrey Golubev and Aleksandr Nedovyesov en route.^[15] The team won their third title together by defeating Mahut/Roger-Vasselin.^[16]

At the 2022 Rolex Paris Masters, Krajicek and Dodig reached the semifinals, defeating Belgian pair Sander Gille/Joran Vliegen^[17] and top seeds Rajeev Ram/Joe Salisbury to reach their seventh final for the season. On 5 November, the pair qualified for the 2022 ATP Finals after defeating German duo Kevin Krawietz and Andreas Mies to reach their seventh final of 2022 as a team. ^[18] Krajicek reached world No. 9 in the rankings on 7 November 2022 and finished the year ranked No. 10 on 21 November 2022.

2023: First Major & Masters titles, American No. 1, World No. 1, US Open mixed doubles finalist

Krajicek at the 2023 Monte-Carlo Masters

Krajicek reached his third Masters final at the Miami Open with Nicolas Mahut^[19] and fourth at the Monte-Carlo Masters with Dodig, the latter of which they won after defeating Romain Arneodo and Sam Weissborn.^[20] As a result Krajicek moved to a new career high of world No. 3 and became the American No. 1 doubles player.

The successful momentum the pair found on clay boosted Krajicek and Dodig to a second consecutive final at the 2023 French Open,^[21] where they won their first Major title together, a victory that crowned Krajicek the new World No. 1.^{[22][23][8][24]} He won his second grass court title with Dodig at the 2023 Queen's Club Championships and reclaimed the No. 1 ranking before Wimbledon.^[25]

At the US Open he reached the mixed doubles final with compatriot Jessica Pegula. At the same tournament he also made it to the semifinals in doubles with Dodig.

Doubles

Current through the 2023 ATP Finals.

Mixed doubles

Grand Slam finals

Doubles: 2 (1 title, 1 runner-up)

Outcome	Year	Championship	Surface	Partner	Opponents	Score
Loss	2022	French Open	Clay	Ivan Dodig	Marcelo Arévalo Jean-Julien Rojer	7–6(7–4), 6–7(5–7), 3–6
Win	2023	French Open	Clay	Ivan Dodig	Sander Gillé Joran Vliegen	6–3, 6–1

Mixed Doubles: 1 (1 runner-up)

Outcome	Year	Tournament	Surface	Partner	Opponents	Score
Loss	2023	US Open	Hard	Jessica Pegula	Anna Danilina Harri Heliövaara	3–6, 4–6

Masters 1000 finals

Doubles: 4 (1 title, 3 runner-ups)

Outcome	Year	Championship	Surface	Partner	Opponents	Score
Loss	2021	Cincinnati Masters	Hard	Steve Johnson	Marcel Granollers Horacio Zeballos	6–7(5–7), 6–7(5–7)
Loss	2022	Paris Masters	Hard (i)	Ivan Dodig	Wesley Koolhof Neal Skupski	6–7(5–7), 4–6
Loss	2023	Miami Open	Hard	Nicolas Mahut	Santiago González Édouard Roger-Vasselin	6–7(4–7), 5–7
Win	2023	Monte-Carlo Masters	Clay	Ivan Dodig	Romain Arneodo Sam Weissborn	6–0, 4–6, [14–12]

Olympic medal matches

Doubles: 1 (4th place)

Result	Year	Tournament	Surface	Partner	Opponents	Score
4th Place	2021	2020 Summer Olympics, Japan	Hard	Tennys Sandgren	Marcus Daniell Michael Venus	6–7(3–7), 2–6

Doubles: 26 (11 titles, 15 runner-ups)

Result	W–L	Date	Tournament	Tier	Surface	Partner	Opponents	Score
Loss	0–1	Jan 2016	Chennai Open, India	250 Series	Hard	Benoît Paire	Oliver Marach Fabrice Martin	3–6, 5–7
Loss	0–2	Feb 2018	Ecuador Open, Ecuador	250 Series	Clay	Jackson Withrow	Nicolás Jarry Hans Podlipnik Castillo	6–7(6–8), 3–6
Loss	0–3	Sep 2018	Chengdu Open, China	250 Series	Hard	Jeevan Nedunchezhiyan	Ivan Dodig Mate Pavić	2–6, 4–6
Win	1–3	Oct 2018	Kremlin Cup, Russia	250 Series	Hard (i)	Rajeev Ram	Max Mirnyi Philipp Oswald	7–6(7–4), 6–4
Loss	1–4	Mar 2019	Mexican Open, Mexico	500 Series	Hard	Artem Sitak	Alexander Zverev Mischa Zverev	6–2, 6–7(4–7), [5–10]
Win	2–4	Jun 2019	Rosmalen Grass Court Championships, Netherlands	250 Series	Grass	Dominic Inglot	Marcus Daniell Wesley Koolhof	6–4, 4–6, [10–4]
Win	3–4	Jul 2019	Atlanta Open, United States	250 Series	Hard	Dominic Inglot	Bob Bryan Mike Bryan	6–4, 6–7(5–7), [11–9]
Loss	3–5	Aug 2019	Los Cabos Open, Mexico	250 Series	Hard	Dominic Inglot	Romain Arneodo Hugo Nys	5–7, 7–5, [14–16]
Win	4–5	Sep 2020	Austrian Open Kitzbühel, Austria	250 Series	Clay	Franko Škugor	Marcel Granollers Horacio Zeballos	7–6(7–5), 7–5
Loss	4–6	Jul 2021	Hall of Fame Open, United States	250 Series	Grass	Vasek Pospisil	William Blumberg Jack Sock	2–6, 6–7(3–7)
Loss	4–7	Aug 2021	Cincinnati Masters, United States	Masters 1000	Hard	Steve Johnson	Marcel Granollers Horacio Zeballos	6–7(5–7), 6–7(5–7)
Loss	4–8	Aug 2021	Winston-Salem Open, United States	250 Series	Hard	Ivan Dodig	Marcelo Arévalo Matwé Middelkoop	7–6(7–5), 5–7, [6–10]
Win	5–8	May 2022	Lyon Open, France	250 Series	Clay	Ivan Dodig	Máximo González Marcelo Melo	6–3, 6–4
Loss	5–9	Jun 2022	French Open, France	Grand Slam	Clay	Ivan Dodig	Marcelo Arévalo Jean-Julien Rojer	7–6(7–4), 6–7(5–7), 3–6
Loss	5–10	Aug 2022	Washington Open, United States	500 Series	Hard	Ivan Dodig	Nick Kyrgios Jack Sock	5–7, 4–6
Loss	5–11	Oct 2022	Firenze Open, Italy	250 Series	Hard (i)	Ivan Dodig	Nicolas Mahut Édouard Roger-Vasselin	6–7(4–7), 3–6
Win	6–11	Oct 2022	Tennis Napoli Cup, Italy	250 Series	Hard	Ivan Dodig	Matthew Ebden John Peers	6–3, 1–6, [10–8]
Win	7–11	Oct 2022	Swiss Indoors, Switzerland	500 Series	Hard (i)	Ivan Dodig	Nicolas Mahut Édouard Roger-Vasselin	6–4, 7–6(7–5)
Loss	7–12	Nov 2022	Paris Masters, France	Masters 1000	Hard (i)	Ivan Dodig	Wesley Koolhof Neal Skupski	6–7(5–7), 4–6
Loss	7–13	Jan 2023	Adelaide International 2, Australia	250 Series	Hard	Ivan Dodig	Marcelo Arévalo Jean-Julien Rojer	Walkover
Win	8–13	Feb 2023	Rotterdam Open, Netherlands	500 Series	Hard (i)	Ivan Dodig	Rohan Bopanna Matthew Ebden	7–6(7–5), 2–6, [12–10]
Loss	8–14	Mar 2023	Miami Open, United States	Masters 1000	Hard	Nicolas Mahut	Santiago González Édouard Roger-Vasselin	6–7(4–7), 5–7
Win	9–14	Apr 2023	Monte-Carlo Masters, Monaco	Masters 1000	Clay	Ivan Dodig	Romain Arneodo Sam Weissborn	6–0, 4–6, [14–12]
Win	10–14	Jun 2023	French Open, France	Grand Slam	Clay	Ivan Dodig	Sander Gillé Joran Vliegen	6–3, 6–1
Win	11–14	Jun 2023	Queen's Club, United Kingdom	500 Series	Grass	Ivan Dodig	Taylor Fritz Jiří Lehečka	6–4, 6–7(5–7), [10–3]
Loss	11–15	Jun 2023	Eastbourne International, United Kingdom	250 Series	Grass	Ivan Dodig	Nikola Mektić Mate Pavić	4–6, 2–6

Singles: 12 (8–4)

Result	W–L	Date	Tournament	Tier	Surface	Opponent	Score
Loss	0–1	Aug 2010	USA F20, Godfrey	Futures	Hard	Robbye Poole	3–6, 5–7
Loss	0–2	Jan 2012	China F1, Shenzhen	Futures	Hard	Jiří Veselý	3–6, 5–7
Win	1–2	Jan 2012	China F2, Shenzhen	Futures	Hard	Zhang Ze	3–6, 6–3, 7–6(7–4)
Win	2–2	Oct 2012	USA F27, Austin	Futures	Hard	Joshua Milton	6–0, 6–1
Loss	2–3	Mar 2013	Canada F1, Gatineau	Futures	Hard (i)	Tim Pütz	2–6, 4–6
Win	3–3	Mar 2013	Canada F2, Sherbrooke	Futures	Hard (i)	Moritz Baumann	6–4, 3–6, 6–2
Win	4–3	Apr 2013	USA F10, Little Rock	Futures	Hard	Luke Saville	6–4, 6–2
Win	5–3	May 2013	USA F13, Tampa	Futures	Clay	Christian Harrison	w/o
Win	6–3	Jul 2013	Canada F4, Saskatoon	Futures	Hard	Tennys Sandgren	7–5, 7–6(8–6)
Win	7–3	Sep 2014	Medellín, Colombia	Challenger	Clay	João Souza	7–5, 6–3
Win	8–3	Apr 2015	León, Mexico	Challenger	Hard	Adrián Menéndez Maceiras	6–7(3–7), 7–6(7–5), 6–4
Loss	8–4	Aug 2015	Aptos, USA	Challenger	Hard	John Millman	5–7, 6–2, 3–6

Doubles: 51 (32–19)

Result	W–L	Date	Tournament	Tier	Surface	Partner	Opponents	Score
Win	1–0	Jul 2008	USA F19, Godfrey	Futures	Hard	Conor Pollock	Daniel Garza Nicolas Santos	6–1, 6–7(6–8), [10–6]
Win	2–0	Jun 2009	USA F12, Loomis	Futures	Hard	Conor Pollock	Alejandro González Eduardo Struvay	6–2, 7–6(7–1)
Loss	2–1	Jul 2009	USA F16, Pittsburgh	Futures	Clay	Rhyne Williams	Haydn Lewis Denis Zivkovic	3–6, 6–3, [3–10]
Loss	2–2	Jul 2011	USA F16, Innisbrook	Futures	Clay	Jeff Dadamo	Benjamin Rogers John-Patrick Smith	6–7(3–7), 3–6
Win	3–2	Jul 2011	USA F20, Godfrey	Futures	Hard	Jeff Dadamo	Joel Kielbowicz Chris Kwon	6–2, 6–3
Win	4–2	Nov 2011	Knoxville, USA	Challenger	Hard (i)	Steve Johnson	Adam Hubble Frederik Nielsen	3–6, 6–4, [13–11]
Loss	4–3	Jan 2012	China F2, Shenzhen	Futures	Hard	Devin Britton	Hsieh Cheng-peng Lee Hsin-han	6–7(5–7), 0–6
Win	5–3	Jan 2012	Mexico F1, Monterrey	Futures	Hard	Devin Britton	Roman Borvanov Christopher Díaz Figueroa	6–2, 6–3
Win	6–3	Feb 2012	Mexico F2, Mexico City	Futures	Hard	Devin Britton	Víctor Estrella Burgos Piero Luisi	6–3, 6–4
Loss	6–4	May 2012	Spain F13, Getxo	Futures	Clay	Rhyne Williams	Iván Arenas-Gualda Enrique López Pérez	7–6(7–5), 6–7(4–7), [7–10]
Win	7–4	Jul 2012	Lexington, USA	Challenger	Hard	John Peers	Tennys Sandgren Rhyne Williams	6–1, 7–6(7–4)
Win	8–4	Sep 2012	USA F26, Irvine	Futures	Hard	Devin Britton	Marcos Giron Dennis Novikov	6–2 ret.
Loss	8–5	Oct 2012	Sacramento, USA	Challenger	Hard	Devin Britton	Tennys Sandgren Rhyne Williams	6–4, 4–6, [10–12]
Win	9–5	Oct 2012	USA F27, Austin	Futures	Hard	Devin Britton	Carsten Ball Chase Buchanan	6–4, 7–5
Win	10–5	Nov 2012	Champaign, USA	Challenger	Hard (i)	Devin Britton	Jean Andersen Izak van der Merwe	6–3, 6–3
Win	11–5	Mar 2013	Canada F2, Sherbrooke	Futures	Hard (i)	Chase Buchanan	Daniel Garza Vahid Mirzadeh	6–3, 6–2
Win	12–5	Apr 2013	USA F10, Little Rock	Futures	Hard	Chase Buchanan	David Rice Sean Thornley	6–2, 6–3
Win	13–5	May 2013	Tallahassee, USA	Challenger	Clay	Tennys Sandgren	Greg Jones Peter Polansky	1–6, 6–2, [10–8]
Loss	13–6	Jun 2013	Mexico F10, Quintana Roo	Futures	Hard	Jean-Yves Aubone	Luis David Martínez David Souto	4–6, 6–4, [6–10]
Win	14–6	Jul 2013	Canada F4, Saskatoon	Futures	Hard	Tennys Sandgren	Roman Borvanov Milan Pokrajac	6–4, 3–6, [10–6]
Win	15–6	Sep 2013	İzmir, Turkey	Challenger	Hard	Tennys Sandgren	Brydan Klein Dane Propoggia	7–6(7–4), 6–4
Win	16–6	Oct 2013	Tiburon, USA	Challenger	Hard	Rhyne Williams	Bradley Klahn Rajeev Ram	6–4, 6–1
Loss	16–7	Nov 2013	Champaign, USA	Challenger	Hard (i)	Tennys Sandgren	Edward Corrie Daniel Smethurst	6–7(5–7), 6–0, [7–10]
Win	17–7	Jan 2014	Nouméa, New Caledonia	Challenger	Hard	Tennys Sandgren	Ante Pavić Blaž Rola	7–6(7–4), 6–3
Loss	17–8	May 2014	Taipei, Chinese Taipei	Challenger	Carpet (i)	John-Patrick Smith	Sam Groth Chris Guccione	4–6, 7–5, [8–10]
Loss	17–9	May 2014	Gimcheon, Korea, Rep.	Challenger	Hard	John-Patrick Smith	Sam Groth Chris Guccione	7–6(7–5), 5–7, [4–10]
Win	18–9	Aug 2014	Vancouver, Canada	Challenger	Hard	John-Patrick Smith	Marcus Daniell Artem Sitak	6–3, 4–6, [10–8]
Win	19–9	Sep 2014	Medellín, Colombia	Challenger	Clay	César Ramírez	Roberto Maytín Andrés Molteni	6–3, 7–5
Loss	19–10	Nov 2014	Ortisei, Italy	Challenger	Hard (i)	James Cluskey	Sergey Betov Aliaksandr Bury	4–6, 7–5, [6–10]
Win	20–10	Jan 2015	Nouméa, New Caledonia	Challenger	Hard	Tennys Sandgren	Jarmere Jenkins Bradley Klahn	7–6(7–2), 6–7(5–7), [10–5]
Win	21–10	Apr 2015	León, Mexico	Challenger	Hard	Rajeev Ram	Guillermo Durán Horacio Zeballos	6–2, 7–5
Win	22–10	Apr 2015	Guadalajara, Mexico	Challenger	Hard	Rajeev Ram	Marcelo Demoliner Miguel Ángel Reyes-Varela	7–5, 4–6, [10–6]
Loss	22–11	Sep 2015	Cary, USA	Challenger	Hard	Nicholas Monroe	Chase Buchanan Blaž Rola	4–6, 7–6(7–5), [4–10]
Loss	22–12	Nov 2015	Champaign, USA	Challenger	Hard (i)	Nicholas Monroe	David O'Hare Joe Salisbury	1–6, 4–6
Loss	22–13	Apr 2016	Le Gosier, Guadeloupe	Challenger	Hard	Mitchell Krueger	James Cerretani Antal van der Duim	2–6, 7–5, [8–10]
Loss	22–14	Sep 2016	Cary, USA	Challenger	Hard	Stefan Kozlov	Philip Bester Peter Polansky	2–6, 2–6
Win	23–14	Nov 2016	Champaign, USA	Challenger	Hard (i)	Tennys Sandgren	Liam Broady Luke Bambridge	7–6(7–4), 7–6(7–2)
Win	24–14	Jan 2017	USA F2, Long Beach	Futures	Hard	Jackson Withrow	Luke Bambridge Joe Salisbury	6–3, 3–6, [10–8]
Win	25–14	Jan 2017	Maui, USA	Challenger	Hard	Jackson Withrow	Bradley Klahn Tennys Sandgren	6–4, 6–3
Win	26–14	Feb 2017	Morelos, Mexico	Challenger	Hard	Jackson Withrow	Kevin King Dean O'Brien	6–7(4–7), 7–6(7–5), [11–9]
Win	27–14	Jul 2017	USA F21, Tulsa	Futures	Hard	Jackson Withrow	Tommy Paul Nathan Ponwith	6–4, 6–2
Loss	27–15	Oct 2017	USA F33, Houston	Futures	Hard	Thai-Son Kwiatkowski	Aron Hiltzik Dennis Nevolo	6–7(3–7), 3–6
Loss	27–16	Nov 2017	Shenzhen, China, P.R.	Challenger	Hard	Jackson Withrow	Sriram Balaji Vishnu Vardhan	6–7(3–7), 6–7(3–7)
Loss	27–17	Nov 2017	Hua Hin, Thailand	Challenger	Hard	Jackson Withrow	Sanchai Ratiwatana Sonchat Ratiwatana	4–6, 7–5, [5–10]
Win	28–17	Mar 2018	Indian Wells, USA	Challenger	Hard	Jackson Withrow	Evan King Nathan Pasha	6–7(3–7), 6–1, [11–9]
Loss	28–18	Jun 2018	Nottingham, Great Britain	Challenger	Grass	Jeevan Nedunchezhiyan	Frederik Nielsen Joe Salisbury	6–7(5–7), 1–6
Win	29–18	Jun 2018	Ilkley, Great Britain	Challenger	Grass	Jeevan Nedunchezhiyan	Kevin Krawietz Andreas Mies	6–3, 6–3
Win	30–18	Jul 2018	Winnetka, USA	Challenger	Hard	Jeevan Nedunchezhiyan	Roberto Maytín Christopher Rungkat	6–7(4–7), 6–4, [10–5]
Win	31–18	Nov 2018	Houston, USA	Challenger	Hard	Nicholas Monroe	Marcelo Arévalo James Cerretani	4–6, 7–6(7–3), [10–5]
Loss	31–19	Mar 2019	Phoenix, USA	Challenger	Hard	Artem Sitak	Jamie Murray Neal Skupski	7–6(7–2), 5–7, [6–10]
Win	32–19	Mar 2022	Monterrey, Mexico	Challenger	Hard	Hans Hach Verdugo	Robert Galloway John-Patrick Smith	6-0, 6-3