Junior years

Krejčíková was ranked junior world No. 3 in October 2013.^[5] In that year, she won the girls' doubles titles at the French Open, at Wimbledon and the US Open with fellow Czech Kateřina Siniaková. Alongside Oleksandra Korashvili from Ukraine, she also reached the final of the Australian Open, falling one match shy of completing the calendar-year Grand Slam. The same year, she also won the European Junior Championship U18 in Klosters, Switzerland in singles and doubles.

Professional career highlights

2014–15: WTA Tour debut, first WTA title in doubles

Krejčíková at the 2015 French Open qualifying tournament

Krejčíková made her WTA Tour debut at the 2014 Gastein Ladies, where she and partner Kateřina Siniaková lost in the first round. In singles, her debut was at the Tournoi de Québec, where she qualified for the main draw and reached the second round, losing to Lucie Hradecká. In doubles there, she reached the semifinals. At the Luxembourg Open, she reached her first WTA Tour doubles final pairing Hradecká. However, they were defeated by Timea Bacsinszky and Kristina Barrois. In 2015, Krejčíková only played one WTA Tour main-draw singles event, at the Tournoi de Québec, where she was defeated in the first round. At all four Grand Slam championships, she failed to qualify for the main draw, losing in the first or second rounds of them all.

In doubles, she had more success, reaching the semifinals at the Diamond Games, debuting in the main draw of the French Open, and winning her first title at the Tournoi de Québec. In November, she won her first WTA 125K title at the Open de Limoges, partnering Mandy Minella.

2016: French Open semifinal and top 30 in doubles

Krejčíková at the 2016 French Open

In singles, Krejčíková mainly played on the ITF Circuit. However, she took part in a few WTA tournaments but lost in qualifying or in early rounds of the main draw. She lost in the first round of qualifying at the Qatar Open, Australian Open, and Wimbledon.

Krejčíková started the year well in doubles, reaching the semifinals at the Auckland Open. Next, she played for the first time at the Australian Open, reaching the second round. In February, she played her first Premier final in doubles at the St. Petersburg Trophy. At the Qatar Open, she made her first appearance at a Premier 5/Premier Mandatory tournament, where she lost in the second round. Her breakthrough came at the French Open, where she, with her doubles partner Siniaková, reached the semifinals, losing to Elena Vesnina and Ekaterina Makarova. This result ranked her in the top 50 for the first time, at No. 34. At Wimbledon, she lost in the first round. At the US Open, she reached her second Grand Slam quarterfinal alongside Siniaková, but lost there to Martina Hingis and CoCo Vandeweghe. She entered the top 30 in rankings for the first time in her career.

2017: First WTA singles final

Krejčíková at the 2017 Wimbledon Championships

In the first few months, Krejčíková had success in singles on the ITF Circuit, but didn't do well on the WTA Tour. She failed in qualification at Taiwan Open and Morocco Open, and failed to reach the main-draw of Australian Open again, losing in the second round of qualification. Then suddenly, in late May, she reached her first WTA singles final at the Nurember Cup, where she played from the qualifying rounds. She lost the final to top seed Kiki Bertens.^[9] This result brought her back to the top 150, for the first time since September 2015. In the grass-court season, she only played in qualifying for Wimbledon, but missed the chance to play in the main-draw. In Båstad, she played in the quarterfinal, where she lost to Caroline Garcia.^[10] For the first time, she had the chance to play in the main draw of the Rogers Cup, but lost in the second round of qualification. At US Open, she also didn't have success, losing in the first round of qualification.

Also in doubles, the first few months were not really successful for Krejčíková, reaching only the second round at the Australian Open, and first round of Sydney International, Taiwan Open and Hungarian Open. During the clay-court season, things get better. At Morocco Open, she reached her first semifinal in 2017. At Madrid Open, she lost in the first round, but at the Italian Open she reached her first Premier 5/Premier Mandatory quarterfinal. At the French Open, partnering with Chan Hao-ching, lost to Lucie Hradecká-Kateřina Siniaková in the third round. In the grass season, she only played at Wimbledon, where she lost in the first round. At Swedish Open, she reached the doubles final, but missed the chance to win the title. At Rogers Cup, she lost in the second round of the doubles, while at the US Open, she reached the third round in doubles. In October, she played the semifinal doubles at the Kremlin Cup.

2018: Two Major titles and World No. 1 in doubles

Together with Siniaková, she won the doubles titles at the 2018 French Open and Wimbledon.

Unlike previous seasons, Krejčíková now had the chance to play, at least, in singles qualifying rounds at more Premier 5/Premier Mandatory events than before. Unfortunately, she failed to qualify for the main draw at Doha, Indian Wells, Miami and Madrid, but finally qualified at the Rogers Cup, where she lost in the first round. At the majors, she also made a little bit of progress, as she finally made it to the main draw of the French Open after qualifying.^[11] In the first round of the main draw, she faced sixth seed Karolína Plíšková but lost.^[12] At the US Open, once again, she failed to qualify.

This year was by far the most successful doubles season for Krejčíková to this point. She started well, reaching the final at the Shenzhen Open, where she and Siniaková lost to Romanian combination Irina-Camelia Begu/Simona Halep. At the Australian Open, they reached the third round, Krejcikova's best result at that tournament. In February, she reached semifinals at the Premier 5 Qatar Open, again with Siniaková. At the Indian Wells Open, they reached the second round. And at the Miami Open, she played her first Premier 5/Mandatory final, but missed the chance to win the title. The clay-court season didn't start so well, reaching only second round of the Madrid Open, and first round of the Italian Open. However, after that, she won her first major doubles title at the French Open. Together with Siniaková, she defeated Japanese pair Eri Hozumi/Makoto Ninomiya in the final.^[13] The grass-court season was successful for Krejčíková, reaching the semifinal at the Birmingham Classic, and winning the title at the Wimbledon. At Wimbledon, again with Siniaková, they defeated Květa Peschke and Nicole Melichar in the final, to win a rare Roland Garros/Wimbledon double.^[14] After Wimbledon, Krejčíková entered the top 5 in doubles for the first time in her career. The US Open Series was also quite successful. Things started slowly at the Rogers Cup, losing in the second round, but at Cincinnati, she and Siniakova reached the quarterfinals. At the US Open, they were close to reaching a third successive Grand Slam final, but were stopped in the semifinal by Ashleigh Barty and CoCo Vandeweghe. On 22 October, Krejčíková, together with her partner Siniaková, became world No. 1 doubles player.^[15] For the first time in her career, Krejčíková had the opportunity to play at the WTA Finals, where she had success. In the first round, Siniaková and Krejčíková defeated Peschke/Melichar, then in semifinals, they defeated Andrea Sestini Hlaváčková/Barbora Strýcová, but unfortunately lost in the final against Tímea Babos/Kristina Mladenovic. Both, Krejčíková and Siniaková finished the year as world-number-1 doubles players.^[16] At the end of 2018, they received the award for the 2018 Doubles Team.^[17]

2019: Doubles Canadian Open champion

Krejčíková began 2019 playing singles mostly on the ITF Circuit where she had some success. On the WTA Tour, the only tournament where she played in main-draw was Bucharest Open, where she reached quarterfinal. Also, she failed to qualify at Australian Open, French Open, US Open and Rogers Cup.

In doubles, the season started really well for Krejčíková. She played at the Brisbane International, where she reached the semifinals. After that, she finally reached the quarterfinal at the Australian Open, and with that result she completed the set of quarterfinals or better at all four Grand Slam tournaments. At Indian Wells, she entered the final, where she and Siniaková lost to Elise Mertens/Aryna Sabalenka. In Miami, she had less success, losing in the first round. The clay-court season started well, with a quarterfinal at the Madrid Open and semifinal at the Italian Open, but suffered a disappointing loss in the first round of the French Open. Wimbledon was more successful for Krejčíková, reaching the semifinals, where she and Siniaková lost to Gabriela Dabrowski/Xu Yifan.

At the Rogers Cup, she finally won her first Premier 5/Premier Mandatory doubles title. Together with Siniaková, they defeated Anna-Lena Grönefeld/Demi Schuurs in the final, in straight sets. At Cincinnati, she reached the quarterfinal. Krejčíková planned to play in doubles, but during her second-round match in qualifying against Asia Muhammad, Krejčíková was forced to retire. In October, she and Siniakova won the title at the Linz Open. For the second year in row, Krejčíková played at the WTA Finals, again with Siniaková, but they didn't pass the group stage, winning only one match.

Krejčíková also played in mixed-doubles competition, winning her first grand slam mixed doubles title. At the Australian Open, she and American player Rajeev Ram won the title.^[18]

2020: Second Mixed doubles Australian Open title

In the COVID-affected 2020 season, Krejčíková finally made progress in singles. For the first time in her career, she qualified for the main draw of the Australian Open, beating Kaia Kanepi before losing to Ekaterina Alexandrova in the second round. During the COVID-19 lockdown, Krejčíková took part in Czech tennis tournaments against players like Petra Kvitová and Karolína Muchová. When the tour restarted in August, Krejčíková impressed in a three-set loss to Simona Halep. She returned to the ITF circuit afterwards, where she had a string of disappointing results. This proved to be a turning point, as she later said she was determined to enjoy her singles tennis more.^[19] At the French Open in September, Krejčíková had a massive breakthrough, reaching the round of 16. There, she lost to qualifier Nadia Podoroska.^[20] She followed with good performances in Ostrava and Linz, where she lost to Victoria Azarenka in the round of 16 and Aryna Sabalenka in the semifinals, respectively. Krejčíková ended the year ranked world No. 65 in singles.

Krejčíková's doubles season started well with a title in Shenzhen over home team Duan Yingying and Zheng Saisai. After that, she played at Australian Open, where she reached the semifinals. In the mixed doubles, she won a second consecutive title, this time with Nikola Mektić.^[21] In Dubai, together with Zheng Saisai, Krejčíková lost in the final to Hsieh Su-wei and Barbora Strýcová. In Doha, again with Siniaková, she reached the semifinals before being defeated by Hsieh and Strýcová once again. After the COVID shutdown, Krejčíková returned to play doubles in August, and reached another semifinal at the Prague Open. She returned with Siniaková to the French Open, where they lost in the semifinals to the defending champions Tímea Babos and Kristina Mladenovic.^[22] Krejčíková's 2020 season ended in Ostrava, where she and Siniaková made it to the semifinals before Krejčíková had to withdraw.

2021: French Open titles, Olympic gold & WTA Finals champion

Krejčíková at the 2021 French Open

Krejčíková began the season ranked world No. 65, and lost in the second round in Abu Dhabi to Yulia Putintseva. She reached the quarterfinals at the Grampians Trophy, beating Lauren Davis and fourth seed Elena Rybakina before losing to Jennifer Brady. While Krejčíková's singles run at the Australian Open was brief, losing in the second round to Ekaterina Alexandrova for the second year in a row, she and Siniaková reached the doubles final but lost to Elise Mertens and Aryna Sabalenka. She won the mixed doubles for the third straight year, returning to partner with Rajeev Ram.^[23]

In the Middle East swing, Krejčíková's most notable result in doubles was making the Doha semifinals with Siniaková, before losing to Jeļena Ostapenko and Monica Niculescu. In singles, Krejčíková progressed to the final following wins over Ostapenko, Svetlana Kuznetsova, and 16th seed Maria Sakkari. There, she lost to Garbiñe Muguruza.^[24] This result entered Krejčíková into the top 40 in singles for the first time. At the Madrid Open, Krejčíková and Siniaková won the women's doubles title, beating Demi Schuurs and Gaby Dabrowski in the final for their biggest title since Wimbledon in 2018.^[25] At Strasbourg, Krejčíková won her maiden singles title, beating Sorana Cîrstea in the final.^[26]

At the French Open, Krejčíková defeated Kristýna Plíšková, Ekaterina Alexandrova and Elina Svitolina to reach the fourth round. She then defeated 2018 finalist Sloane Stephens, 6–2, 6–0 to reach her first Grand Slam singles quarterfinal.^[27] She there defeated Coco Gauff in straight sets^[28] to set up a semifinal with Maria Sakkari, which she won in three sets, saving a match point en route. In her first ever Grand Slam final in only her fifth main draw singles appearance,^[29] Krejčíková beat Anastasia Pavlyuchenkova in three sets to claim her first Grand Slam singles title.^[30] As a result, she entered the top 15 in singles for the first time in her career.^[31] In doubles, Krejčíková and Siniaková beat the Plíšková sisters in an all Czech quarterfinal^[32] and Bernarda Pera and Magda Linette in the semifinals. They then defeated Bethanie Mattek-Sands and Iga Świątek in straight sets to claim their second French Open title,^[33][34] and the first singles/doubles sweep in Paris since Mary Pierce in 2000.^[35] As a result, Krejčíková & Siniaková reclaimed the No. 1 and No. 2 doubles positions, respectively.^[36]

Three weeks later, Krejčíková made her Wimbledon singles debut, where she was seeded for the first time in a Grand Slam. She beat Clara Tauson, Andrea Petkovic and Anastasija Sevastova before losing to the world No. 1 Ashleigh Barty in the fourth round, ending her 15-match winning-streak. She quickly got back to her winning ways, however, claiming the Prague Open over Tereza Martincová in the final. It was her third singles title in four tournaments played.^[37] At the 2020 Olympics in July, Krejčíková defeated Zarina Diyas and Leylah Fernandez before losing to Belinda Bencic in the third round.^[38] With Siniaková, she won gold in the doubles event, beating Bencic and Viktorija Golubic in the final.^[39]

Krejčíková then made her main-draw singles debut at the 2021 US Open. She began with straight-sets wins over Astra Sharma, Christina McHale, Kamilla Rakhimova, and ninth seed Muguruza to reach her maiden US Open quarterfinal.^{[40][41][42][43]} With an injury sustained in the Murguruza match, Krejčíková was beaten in the quarterfinals by Aryna Sabalenka. On 20 September, Krejčíková reached a new-career high ranking of world No. 5.,^[44] which was surpassed on 1 November when she reached world No. 3.

Krejčíková represented the Czech Republic in the inaugural 2020–21 Billie Jean King Cup Finals in Prague in November. However, the long season appeared to catch up with her as she lost both of her singles rubbers to Angelique Kerber of Germany and Bencic of Switzerland, and did not play the doubles. One week later, Krejčíková played in the WTA Finals in singles for the first time in her career, and was the first player to do so in both singles and doubles since Karolína Plíšková in 2016. Seeded second, she lost to Muguruza, Plíšková, and Anett Kontaveit during the round robin stage. However, she and Siniaková went unbeaten in the doubles tournament, going undefeated to take the title. With the win over Mertens and Hsieh in the final, Siniaková rose to become the world No. 1, with Krejčíková as No. 2. Krejčíková was awarded the ‘Most Improved Player’ award in the official WTA year-end awards as well as ‘Doubles Team of the Year’ with Siniaková.^[45] She ended this breakthrough year as world No. 5 in singles, and No. 2 in doubles.

2022: Doubles Career Golden Slam, doubles world No. 2

Krejčíková began the season as the third seed at the Sydney International, a WTA 500 event. She defeated Jaqueline Cristian, Caroline Garcia, and fourth seed Anett Kontaveit en route to the final; her match against Kontaveit was particularly remarkable, as she came back from being bagelled in the first set to winning a final-set tiebreak 14–12, saving 7 match points. She lost in the final via another final-set tiebreak to fifth seed Paula Badosa.

As the fourth seed in singles at the 2022 Australian Open, Krejčíková reached the quarterfinals, defeating Andrea Petkovic, Wang Xiyu, 26th seed Jeļena Ostapenko, and 24th seed Victoria Azarenka, before losing to Madison Keys. In doubles, she reached the final alongside Siniaková,^[46][47] where they won their fourth major doubles title over Beatriz Haddad Maia and Anna Danilina.^[8]

Krejčíková followed up her performance in Australia with two early exits, falling to Dayana Yastremska in the second round of Dubai and Jeļena Ostapenko in the third round of Doha where she was forced to withdraw during a doubles match with Siniaková after injuring her right arm. Despite this setback she reached No. 2 in the world in the WTA singles rankings on 28 February 2022.

Originally scheduled to participate in Indian Wells as the top seed, she pulled out due to the ongoing arm injury that flared up just before the start of the tournament. This injury also kept Krejčíková out of the Miami Open, and forced her to withdraw from all four clay-court tournaments she had signed up for in Stuttgart, Madrid, Rome, and Strasbourg, the latter at which she was the defending champion.

Having not played a match in three months due to an elbow injury, Krejčíková entered the French Open singles draw as the second seed and defending champion. She was upset in the first round by French wildcard Diane Parry; it was only the third time in the history of the event that the defending champion lost in the first round, after Anastasia Myskina in 2005 and Jeļena Ostapenko in 2018.^[48] She was later forced to withdraw from the doubles draw as well after testing positive for COVID-19.^[49][50]

Krejcikova's grass court season did not start well with an early loss to Marta Kostyuk at the 2022 Eastbourne International in singles and winning just one match in doubles where she partnered Ena Shibahara. At the 2022 Wimbledon Championships, she reached the third round in singles before losing to Ajla Tomljanović in three sets.^[51] At the same tournament in doubles, she reached the final with her partner Siniakova and won the title for a second time defeating top seeds Elise Mertens and Zhang Shuai in straight sets.^[52]

At the US Open Krejcikova once again lost early in singles, going out in second round to Aleksandra Krunić. However, she was more successful in doubles, where she won the title with Siniaková, coming back from a set down to defeat Taylor Townsend and Caty McNally in the final. With this win Krejcikova and Siniaková completed the Career Golden Slam, and took their third women's doubles Grand Slam title of the year, remaining undefeated in slams in 2022.^[53][54]

Krejcikova returned to the singles court at the inaugural 2022 Tallinn Open and got first ever wins against her first four opponents: Ajla Tomljanović, Marta Kostyuk, Beatriz Haddad Maia and Belinda Bencic, four players she had never beaten before.^[55] In the final, Krejcikova defeated home favourite Anett Kontaveit in straight sets to win the title.^[56] A week later, Krejcikova won the title at the 2022 Ostrava Open, her second title in her home country and fifth career singles title. She defeated world number 1, Iga Świątek in three sets, giving Swiatek her first defeat in a final in three years.^[57]
Krejcikova crashed out of the final WTA1000 of the year, the 2022 Guadalajara Open Akron in the first round. She and Siniaková made the semifinals in the doubles, before losing a match tiebreak to Haddad Maia and Danilina.
The pair then played the 2022 WTA Finals – Doubles in Fort Worth, Texas. The Czechs went undefeated in the round robin stage but were defeated in the final by Veronika Kudermetova and Elise Mertens.^[58]

2023: Australian Open doubles & WTA 1000 singles titles

Krejčíková started her 2023 season at 2023 Adelaide International 2. Having struggled with a left wrist injury since Fort Worth, she lost in the second round to Daria Kasatkina.

At the Australian Open singles tournament, Krejčíková made it to the fourth round but lost to Jessica Pegula. In the Australian Open doubles she reunited with Katerina Siniaková where they won their 24th consecutive grand slam match and their seventh doubles grand slam title and for the first time, defended a Major title.^[59] Krejčíková's 11th Grand Slam title.

She won her first tournament of the season at the 2023 Dubai Tennis Championships defeating five seeds in a row and four top-10 players: 7th seed Daria Kasatkina, 12th seed Petra Kvitová, world No. 2 Aryna Sabalenka, handing her her first defeat of 2023 and ending a 13-match winning streak,^[60] world No. 3 Jessica Pegula, for her tenth top-10 win of her career,^[61][62] and finally world No. 1 Iga Świątek, also snapping her six match winning streak. This was Krejčíková's maiden WTA 1000 title in singles; with the win, she moved up 14 positions to No. 16, and became just the fifth woman to defeat the world No. 1, 2, and 3 in a single tournament and the only one to do it in three consecutive days.^[63][64]

As the top seed at the 2023 Birmingham Classic, she reached the semifinals defeating compatriot Linda Fruhvirtová. As a result she returned to the top 10 in the singles rankings.^[65] Next she defeated Zhu Lin to reach the final. In the final, Krejčíková lost to Jeļena Ostapenko.^[66] In doubles she won the title partnering Marta Kostyuk.

Krejčíková was forced to withdraw from the 2023 Wimbledon Championships after injuring her ankle and this injury also meant she had to withdraw from the doubles, despite being defending champion.^[67]

She also announced that she was splitting with long term coach, Ales Kartous. Krejcikova has been working with Pavel Motl, a friend and hitting partner, but still did not have a full time replacement coach, as of the end of the 2023 season.^[68]

After a difficult return from injury where she suffered several early losses, Krejčíková won her 7th career singles title, the San Diego Open, defeating Sofia Kenin in the final. Alongside Kateřina Siniaková she took the doubles title as well, defeating Danielle Collins and CoCo Vandeweghe in the final.^[69] As a result she returned to the top 10 in the rankings on 18 September 2023.^[70]

Krejčíková competed in the WTA Elite Trophy as the top seed but went out in the group stage. In November, she represented the Czech Republic in the 2023 Billie Jean King Cup finals in Seville, winning one singles and two doubles matches alongside Siniakova. The same month, in a shock announcement, Krejčíková and Siniaková split, a move initiated by Siniaková who felt other teams know them too well.^[71][72]

Krejčíková ended the year ranked No. 10 in singles and No. 13 in doubles.^[73]

Grand Slam performance timelines

Grand Slam tournament finals

Singles: 1 (title)

Result	Year	Tournament	Surface	Opponent	Score
Win	2021	French Open	Clay	Anastasia Pavlyuchenkova	6–1, 2–6, 6–4

Doubles: 8 (7 titles, 1 runner-up)

Result	Year	Tournament	Surface	Partner	Opponents	Score
Win	2018	French Open	Clay	Kateřina Siniaková	Eri Hozumi Makoto Ninomiya	6–3, 6–3
Win	2018	Wimbledon	Grass	Kateřina Siniaková	Nicole Melichar Květa Peschke	6–4, 4–6, 6–0
Loss	2021	Australian Open	Hard	Kateřina Siniaková	Elise Mertens Aryna Sabalenka	2–6, 3–6
Win	2021	French Open (2)	Clay	Kateřina Siniaková	Bethanie Mattek-Sands Iga Świątek	6–4, 6–2
Win	2022	Australian Open	Hard	Kateřina Siniaková	Anna Danilina Beatriz Haddad Maia	6–7(3–7), 6–4, 6–4
Win	2022	Wimbledon (2)	Grass	Kateřina Siniaková	Elise Mertens Zhang Shuai	6–2, 6–4
Win	2022	US Open	Hard	Kateřina Siniaková	Caty McNally Taylor Townsend	3–6, 7–5, 6–1
Win	2023	Australian Open (2)	Hard	Kateřina Siniaková	Shuko Aoyama Ena Shibahara	6–4, 6–3

Mixed doubles: 3 (3 titles)

Result	Year	Tournament	Surface	Partner	Opponents	Score
Win	2019	Australian Open	Hard	Rajeev Ram	Astra Sharma John-Patrick Smith	7–6(7–3), 6–1
Win	2020	Australian Open (2)	Hard	Nikola Mektić	Bethanie Mattek-Sands Jamie Murray	5–7, 6–4, [10–1]
Win	2021	Australian Open (3)	Hard	Rajeev Ram	Samantha Stosur Matthew Ebden	6–1, 6–4

Olympic medal matches

Doubles: 1 (gold medal)

Result	Year	Tournament	Surface	Partner	Opponents	Score
Gold	2021	Tokyo 2020	Hard	Kateřina Siniaková	Belinda Bencic Viktorija Golubic	7–5, 6–1

Year-end championships finals

Doubles: 3 (1 title, 2 runner-ups)

Result	Year	Tournament	Surface	Partner	Opponents	Score
Loss	2018	WTA Finals, Singapore	Hard (i)	Kateřina Siniaková	Tímea Babos Kristina Mladenovic	4–6, 5–7
Win	2021	WTA Finals, Guadalajara	Hard	Kateřina Siniaková	Hsieh Su-wei Elise Mertens	6–3, 6–4
Loss	2022	WTA Finals, Fort Worth	Hard (i)	Kateřina Siniaková	Veronika Kudermetova Elise Mertens	2–6, 6–4, [9–11]