Mladenovic has won one singles and sixteen doubles titles on the WTA tour, as well as four singles and seven doubles titles on the ITF tour in her career. On 19 June 2017 she reached her best singles ranking of World No. 12. On 24 October 2016, she peaked at World No. 2 in the doubles rankings.
Although Mladenovic has enjoyed success in singles, her greatest achievements have all come in doubles, having won the mixed doubles titles at the 2014 Australian Open and 2013 Wimbledon Championships alongside Daniel Nestor and reaching the 2014 Wimbledon doubles final with Tímea Babos. At the 2016 French Open, Kristina won the doubles tournament with Caroline Garcia.
Kristina Mladenovic was born in Saint-Pol-sur-Mer, in the Nord department of France. Her father is Dragan Mladenović, a former handball player for Yugoslavia, and her mother Dženita is a former volleyball player. They moved to France in 1992 when Dragan was signed by Dunkirk. All became French citizens. Mladenovic has a brother named Luka. She speaks 5 languages.
Mladenovic started playing juniors in May 2006. In 2007 Mladenovic became the European Under 14 singles champion. Her biggest junior achievement was at the 2009 Junior French Open Girls' Singles, where she beat Daria Gavrilova of Russia in two sets in the final. Her highest junior ranking was No. 1, on 8 June 2009. She advanced to both the Girls' Singles and Doubles finals at the 2009 Junior Wimbledon, losing to Noppawan Lertcheewakarn in the singles. In doubles, with partner Silvia Njirić, lost also to Lertcheewakarn, who partnered Sally Peers.
She began playing on the ITF circuit in September 2007. On the WTA Tour she tried to qualify for Open Gaz de France, but lost her first match to Petra Kvitová. At the 2009 Australian Open, Kristina received a wild card, but was defeated by the No. 14 seed, Patty Schnyder. In July Kristina qualified for the 2009 ECM Prague Open but lost in the first round to Zarina Diyas of Kazakhstan.
At the Internationaux de Strasbourg Mladenovic won her first match on the WTA Tour, coming back from 5–2 in the final set to win the tiebreak against Stefanie Vögele.
Mladenovic played for France at the 2011 Hopman Cup, partnering with Nicolas Mahut. France was drawn in the same group as the United States, Great Britain, and Italy. Mladenovic beat Francesca Schiavone and Laura Robson while losing to Bethanie Mattek-Sands in the singles matches. In the mixed doubles she and Mahut won one of their three matches.
Mladenovic started 2011 year at 2011 Australian Open but lost in the first round of qualifying to Heather Watson. Mladenovic won her first Senior title at a $25,000 tournament in Sutton, defeating Mona Barthel. This was followed with a win in Stockholm the following week, defeating Arantxa Rus in the final. Padova defeating Karin Knapp in three sets.
At the start of the year Mladenovic linked up with Biljana Veselinovic but they split just before Wimbledon and since then she had been coached by Thierry Ascione. Mladenovic claimed her first WTA Tour title of any type in Montreal when she and Klaudia Jans-Ignacik won the doubles title at the Rogers Cup. Mladenovic made it through to the third round of the US Open after defeating Pavlyuchenkova. At the Bell Classic in Quebec, Mladenovic reached her first WTA Semifinal. With Tatjana Malek, Mladenovic won her second WTA doubles title at the Bell Classic. Following her run to the semifinals, Mladenovic entered the top 100 in the rankings for the first time. Mladenovic won the first ever WTA 125s event the Taipei WTA Ladies Open and took the doubles crown as well.
At the 2013 Open GDF Suez, a WTA Premier tournament, Mladenovic made the semifinals, including defeating Petra Kvitová. Teaming with Daniel Nestor she made it to the final of the 2013 French Open in mixed doubles where they were defeated. However, she and Nestor rebounded at the mixed doubles at the 2013 Wimbledon capturing her first grand slam title.
At the 2013 U.S. Open, she beat Anabel Medina Garrigues 6–1, 1–6, 6–1 in the first round and then lost to the 23rd seed Jamie Hampton 7–5, 6–4 in the second round. Mladenovic partnered up with Daniel Nestor to reach the semifinals of the Mixed Doubles, where they were defeated by the seventh seeded team of Max Mirnyi and Andrea Hlaváčková 7–5, 6–7, [12–10].
Mladenovic would start 2014 off strong capturing her second Mixed Doubles Grand Slam title at the 2014 Australian Open partnering again with Daniel Nestor. At the Open GDF Suez, she defeated Australian Open Quarter Finalist Simona Halep in the first round. At Roland Garros, she upset Li Na (world No.2 and 2011 champion) in the first round, her first top 5 win. She continued her strong performance with a three-set win over American Alison Riske in the second round. In the Round of 32 she was beaten by eventual semifinalist Andrea Petkovic.
Mladenovic opened her grass court season in Birmingham, but lost her opening match to Shahar Pe'er of Israel. She then competed in 's-Hertogenbosch qualifying, managing to win a round but ultimately falling to CoCo Vandeweghe, who would go on to qualify and win the entire tournament. At Wimbledon, she drew Zarina Diyas in the first round, but fell to the Kazakh in what was a rain delayed straight-set encounter. In the doubles draw, Mladenovic partnered Tímea Babos of Hungary, and reached their first Grand Slam women's doubles final, ultimately losing to Sara Errani and Roberta Vinci in straight sets. She then stunned at the İstanbul Cup the 3rd seed Klára Koukalová, but lost in the semifinals to No. 1 seed Caroline Wozniacki. Her strong run returned her to the top 100, at No. 81. She then traveled to Baku, where she lost in quarterfinals, losing to Francesca Schiavone in a rematch of the İstanbul Cup quarterfinals. She next competed at the Citi Open, where she stunned top seeded Lucie Šafářová, before defeating qualifier Taylor Townsend. She lost to Kurumi Nara in the quarterfinals. After the Citi Open, Mladenovic lost in the final round of qualifying to Yanina Wickmayer in Montréal, and also the first round of qualifying in Cincinnati. She played doubles in Montréal, losing in the first round with partner Tímea Babos.
Mladenovic began the year losing in the second round of the 2015 Australian Open to Bethanie Mattek-Sands. She, along with Daniel Nestor, reached the final of the mixed doubles event. She lost in the second round of the 2015 Diamond Games in Antwerp to Lucie Šafářová.
She reached the semifinals of Marrakesh, losing to her doubles partner Tímea Babos. She reached the singles final in Strasbourg, her first ever WTA Tour singles final, where she lost to Samantha Stosur. Her strong showing at both tournaments ensured her entry into the top 50 of the WTA singles rankings.
At the 2015 French Open, Mladenovic once again stunned a top-10 player in her opening match by defeating World No. 6 Eugenie Bouchard of Canada. She advanced to the third round with a victory over Danka Kovinić but lost to Belgian Alison Van Uytvanck in straight sets while fighting for a spot in the last 16.
At the Topshelf Open, Mladenovic lost to eventual finalist and good friend Belinda Bencic, despite having match point opportunities. At the 2015 Aegon Classic, she beat Eugenie Bouchard again 3–6, 6–4, 6–0, and then once again stunned a top-10 player by defeating world No. 3 Simona Halep of Romania 2–6, 6–0, 7–6.
At the 2015 US Open, she reached the quarterfinals with wins over Svetlana Kuznetsova, Bojana Jovanovski, lucky loser Daria Kasatkina and Ekaterina Makarova before losing to eventual finalist Roberta Vinci in the quarterfinals, and entered the top 30 of the WTA singles rankings for the first time in her career.
In May, Mladenovic reached the singles semi finals of a WTA Tour event, The Internationaux de Strasbourg, but lost to Mirjana Lučić-Baroni.
At the French Open, Mladenovic won her 1st round match against the 2010 French Open singles champion Francesca Schiavone, and defeated her former doubles partner Tímea Babos in the 2nd round. She lost in the 3rd round to World No. 1 and defending champion Serena Williams 6–4, 7–6, [12–10], and had a set point at 9–8 against Williams in the tiebreak. Mladenovic won the women's doubles event partnering Caroline Garcia, beating Ekaterina Makarova and Elena Vesnina in the final. It was the first Grand Slam women's doubles crown for Garcia and Mladenovic and they became the first all-French pair to win the French Open women's doubles title since Gail Chanfreau and Françoise Dürr in 1971.
In June, Mladenovic reached her second career WTA Tour singles final at the Rosmalen Grass Court Championships. She lost her final match to CoCo Vandeweghe 7–5, 7–5.
Mladenovic participated in the women's singles, women's doubles and mixed doubles events of the 2016 Summer Olympics. In the women's singles, she was defeated in the second round by Madison Keys. In the women's doubles event, Mladenovic partnered countrywoman Caroline Garcia, with whom she had won the French Open in June. Despite being seeded No. 2, they lost in the first round. Mladenovic (she was paired with Pierre-Hugues Herbert and they were seeded No. 2,) also lost in the first round of the mixed doubles event.
At the 2016 US Open singles event, Mladenovic cleared the first round before falling to Anastasia Pavlyuchenkova in the second round. In the doubles event, Mladenovic (partnered with Garcia) reached the final, where the French team was defeated by Bethanie Mattek-Sands andLucie Šafářová. This allowed Garcia and Mladenovic to qualify for the 2016 WTA Finals, becoming the second doubles team yet to do so.
Mladenovic moved on to the Asian swing, starting at the Korea Open. Seeded No. 4, Mladenovic had a surprise loss against Sara Sorribes Tormo, the 139th player in the world. Next, at the Wuhan Open, Mladenovic faced world No. 1 Angelique Kerber in the second round. Kerber won the match, although Mladenovic captured the first set. In doubles, Mladenovic partnered with Garcia again, and the team was seeded No. 1. Despite this, the Frenchwomen lost their opening match against Christina McHale and Peng Shuai. In Beijing, Mladenovic defeated former number 1 Jelena Jankovic in the first round, before coming across 8th seed Madison Keys. Keys won in straight sets. In doubles, Mladenovic and Garcia, once again the no. 1 seeds, made their way to the final, in which they faced Bethanie Mattek-Sands and Lucie Šafářová, in a rematch of the US Open final a few weeks earlier. Mattek-Sands and Šafářová won the final 6–4, 6–4.
Mladenovic had success in singles at the 2016 Hong Kong Tennis Open. An unseeded player, she reached the semifinals after defeating doubles rival Mattek-Sands in the quarterfinals. She passed No. 8 seed Daria Gavrilova to reach her second singles final of the year. She was defeated by former No. 1 Caroline Wozniacki in the final.
Shortly before heading into the 2016 WTA Doubles Finals, Mladenovic and Caroline Garcia received the WTA Award for Best Doubles Team of the Year. During the WTA Finals, the Frenchwomen defeated Julia Görges and Karolína Plíšková in the quarterfinals, but fell to Mattek-Sands and Šafářová in the semifinals.
During the 2016 Fed Cup final between France and the Czech Republic, Mladenovic lost the first rubber narrowly against Karolína Plíšková 3–6, 6–4, 14–16, a match that lasted 3 hours and 48 minutes. She later played doubles with Garcia in the fifth and decisive rubber against Plíšková and Barbora Strýcová, which they lost 5–7, 5–7, enabling the Czechs to win the Fed Cup for the fifth time in six years.
In December, Garcia and Mladenovic were named the doubles ITF World Champions of 2016. Mladenovic ended the year ranked No. 42 in singles, and tied No. 2 in doubles (with Garcia).
Mladenovic began the year by playing at the 2017 Hopman Cup alongside Richard Gasquet. The pair won their first tie against Germany's Andrea Petkovic and Alexander Zverev 2–1 (Mladenovic lost her singles match against Petkovic), and their second tie against Great Britain's Daniel Evans and Heather Watson 3–0. In France's third Group A tie against Switzerland which would decide which team would enter the final, Mladenovic (following Gasquet's defeat to Roger Federer) defeated Belinda Bencic and triumphed with Gasquet against the Swiss pair in mixed doubles, winning the tie 2-1. In the final, Mladenovic and Gasquet faced Americans Jack Sock and Coco Vandeweghe. Although Gasquet won his singles match and Mladenovic lost hers, the French duo won the decisive mixed doubles match, meaning that France were the 2017 Hopman Cup champions.
Mladenovic had a disappointing run at the Australian Open in singles, losing in the first round to Ana Konjuh. However, in doubles, Mladenovic, reuniting with partner Caroline Garcia, reached the semifinals of the event, where they lost to Andrea Hlaváčková and Peng Shuai.
At the St. Petersburg Ladies Trophy, Mladenovic won her first round match against Elise Mertens before upsetting reigning Australian Open finalist Venus Williams to reach the quarterfinals. She continued her fabulous form against No. 6 seed and defending champion Roberta Vinci, defeating the Italian veteran in straight sets. In the semifinals, the Frenchwoman defeated rising player Natalia Vikhlyantseva to reach the first WTA Premier singles final of her career. In a tense final, Mladenovic defeated Yulia Putintseva, 6–2, 6–7(3–7), 6–4 to win the first WTA Tour singles title of her career. Mladenovic became the first Frenchwoman to win a WTA Premier singles title since Marion Bartoli in June 2011. In addition, Mladenovic competed in doubles with Daria Gavrilova; this was the first time Mladenovic played with someone other than Garcia in over a year. The pair were defeated in the semifinals.
In the 2017 Fed Cup World Group quarterfinals against Switzerland, Mladenovic won her first singles match against Belinda Bencic. However, she then lost to Timea Bacsinszky in her next singles match. France lost the tie 4-1, resulting in France needing to win the Fed Cup World Group Play-off tie to earn the right to play in the 2018 Fed Cup World Group.
At the Dubai Tennis Championships, the first Premier 5 event of the season, Mladenovic defeated Kateřina Siniaková in the first round before defeating world No. 3 Karolína Plíšková 6-2, 6-4 in the second round. She then lost to Wang Qiang in the third round. Mladenovic's good form continued at the Mexican Open, where she stormed past Varvara Lepchenko before winning a marathon match against Heather Watson to reach the quarterfinals, in which she defeated Kirsten Flipkens. Mladenovic then won her semifinal encounter with Christina McHale, reaching her second WTA Tour singles final of 2017. Though she did end up losing to Lesia Tsurenko in the final, her success in February allowed Mladenovic to reach a career-high ranking of 26. Moreover, Mladenovic was nominated for February's WTA Shot of the Month, WTA Breakthrough Player of the Month, and WTA Player of the Month (winning the WTA Breakthrough Player of the Month).
Prior to the 2017 BNP Paribas Open, Mladenovic announced that her doubles partnership with Caroline Garcia would end as per Garcia's request, as Garcia wanted to focus on her singles career. Mladenovic instead competed with Svetlana Kuznetsova in the doubles draw of Indian Wells. Meanwhile, in singles, the Frenchwoman received a bye into the second round, being seeded No. 28. She had a strong opening, defeating Annika Beck of Germany. In the third round, Mladenovic continued her newfound success by defeating world No. 4 Simona Halep in straight sets, setting up an encounter with Lauren Davis, which she won in straight sets as well, reaching her first career WTA Premier Mandatory singles quarterfinals. Mladenovic continued to shine, defeating Caroline Wozniacki 3-6, 7-6(4), 6-2 (Mladenovic had never beaten Wozniacki in three previous encounters) before losing to eventual champion Elena Vesnina in the semifinals. Her good performance at the BNP Paribas Open enabled Mladenovic to attain a career-high WTA singles ranking of 18, and she became the No. 1 Frenchwoman once again (passing Caroline Garcia). She also had success with Kuznetsova in the doubles, knocking out the 5th-seeded pair of Andrea Hlaváčková and Peng Shuai in the second round before losing in the quarterfinals.
At the Miami Open, Mladenovic lost her opening singles match to the Romanian qualifier Patricia Maria Țig. In doubles, Mladenovic (playing again with Kuznetsova) faced Hlaváčková and Peng in the quarterfinals, in a repeat of their Indian Wells encounter. This time, Hlaváčková and Peng won the match, and Mladenovic missed the opportunity to become doubles world no. 1.
At the Porsche Tennis Grand Prix, Mladenovic defeated top seed Angelique Kerber in the second round and three-time champion Maria Sharapova (who was playing her first WTA tournament after serving a 15-month suspension for failing a drug test) in the semifinals to reach her third WTA Tour singles final of the year. In the final against German wild card Laura Siegemund (who was playing in her hometown), Mladenovic led 4-1 in the final set tiebreak but ended losing the match 1-6, 6-2, 6-7(5-7).
Mladenovic, seeded no. 14, reached her first career WTA Premier Mandatory singles final at the Mutua Madrid Open by defeating her doubles partner Svetlana Kuznetsova in the semifinals. in the final, she lost to third seeded Simona Halep in three sets. On 15 May (the day after the Madrid final), Mladenovic reached a career-high WTA singles ranking of 14. Seeded no. 13, Mladenovic lost her singles first round match against Julia Görges at the Internazionali BNL d'Italia.
Mladenovic then started her campaign at her home grand slam, the 2017 French Open. She won her first round match in a tight three sets against American Jennifer Brady to advance to the second round where she faced the 2012 finalist Sara Errani whom she defeated in straight sets to advance to the third round at the tournament once again where she had another close match against last years quarterfinalist Shelby Rogers. She then advanced to the fourth round; her best showing at this tournament. She then faced the defending champion Garbiñe Muguruza who she defeated in three sets to advance to her second quarterfinals of a grand slam in her career. She then lost to Timea Bacsinszky.
Mladenovic employs an all-court playing style, using variety, along with her baseline play to win points. Her forehand is the stronger wing, and is hit both flatly, and with topspin. Her backhand is a solid shot, and she is capable of hitting her two-hander consistently and can earn winners from it, but she does also tend to use the backhand slice a lot to change the pace of the rally. She possesses a powerful serve, and her height of 1.84 m (6 ft 1⁄2 in) means that she is able to nail first serves in accurately and produce a lot of aces. However, her second serve is a lot weaker and she can serve a lot of doubles faults in a match. Her doubles success in recent years means she has developed a very good net game as well and she frequently approaches the net to finish off points. She uses her volleys, along with her backhand slice, and drop shots to create a lot of variety in her game. Her movement around the court is very good, considering her height and her footwork is good around the court, but this can be exposed as a weakness when she needs to recover.
Mladenovic wears Adidas clothing and uses Wilson rackets.