[20] On 10 December 2010, in Paris, Hingis married then-24-year-old Thibault Hutin, a French equestrian show jumper she had met at a competition in April of that year.

On 20 July 2018, Hingis married sports physician Harald Leemann in Switzerland in a secret ceremony at the Grand Resort Bad Ragaz.

[26] In 1996, Hingis became the youngest Grand Slam champion of all time, when she teamed with Helena Suková at Wimbledon to win the women's doubles title at age 15 years and 9 months.

She then became the youngest Grand Slam singles winner in the 20th century by winning the Australian Open at age 16 years and 3 months (beating former champion Mary Pierce in the final).

[35] After a shock first-round, straight set, loss to Jelena Dokić at Wimbledon,[36] Hingis bounced back to reach her third consecutive US Open final, where she lost to 17-year-old Serena Williams.

[39] Hingis didn't drop a set in any of her singles matches during the event, defeating Tamarine Tanasugarn, Nicole Pratt, Amanda Coetzer, and Monica Seles.

The International Tennis Federation's report on the matter states that "the very low estimated concentration of benzoylecgonine (42 ng/ml) was such that it would go unreported in many drug testing programmes such as that of the US military, which uses a screening threshold of 150 ng/ml.

After the Nottingham event, Billie Jean King stated that she believed that Hingis might return to the WTA Tour on the doubles circuit, after competing in the WTT.

[69] On 5 June 2011, Hingis, paired with Lindsay Davenport, won the Roland Garros Women's Legends title, defeating Martina Navratilova and Jana Novotná in the final.

[70][71] On 3 July, Hingis partnering Lindsay Davenport won the Wimbledon Ladies' Invitation Doubles title, defeating Navratilova and Novotná in the final.

Hingis and Davenport successfully defended their Wimbledon Ladies' Invitation Doubles title in 2012, again beating Martina Navratilova and Jana Novotná in the final.

Hingis was inducted into the International Tennis Hall of Fame in July 2013, and in the same month, announced that she was coming out of retirement to play a doubles tournament, with Daniela Hantuchová as her partner, in Carlsbad, California.

At the Wimbledon Championships, she reached the quarterfinals with partner Bruno Soares in mixed doubles, where they lost to Daniel Nestor and Kristina Mladenovic in straight sets.

The following day, Hingis then won the mixed doubles final, partnering with Leander Paes, to defeat Alexander Peya and Tímea Babos in straight sets.

After two semifinal losses in Toronto and Cincinnati, Hingis won the mixed doubles title at the US Open on 12 September, partnering Paes, defeating Sam Querrey and Bethanie Mattek-Sands in three sets.

Hingis and Mirza started their clay season by reaching the finals of Porsche Tennis Grand Prix and Madrid Open, where they lost to Kristina Mladenovic and Caroline Garcia in both the tournaments.

At the French Open, they were upset by Czech pair Barbora Krejčíková and Kateřina Siniaková in the third round, which ended their 20 match winning streak in Grand Slam doubles tournaments.

[80] She played doubles with Timea Bacsinszky and won the silver medal, losing to Ekaterina Makarova and Elena Vesnina in straight sets in the final.

At the WTA Finals, Hingis reunited with Sania Mirza in what would be the partnership's last tournament together; they defeated the Chan sisters in the quarterfinals but then lost to Makarova and Vesnina.

[86] In preparation for the upcoming Fed Cup quarterfinal match between Switzerland and France, Hingis partnered with Belinda Bencic to defend her St. Petersburg title.

[89] They fell to Olga Savchuk and Yaroslava Shvedova in the semifinals of the Qatar Open[90] and to Andrea Hlaváčková and Peng Shuai in straight sets in the quarterfinals of the Dubai Tennis Championships.

[91] However, they immediately rebounded by winning their first title together at the Indian Wells Open, defeating Hingis's old partner Sania Mirza with Barbora Strýcová in the quarterfinals,[92] top seeded Mattek-Sands and Šafářová in the semifinals,[93] and Czech pair Lucie Hradecká and Kateřina Siniaková in the final.

[95] Hingis again sought to practice with a Swiss partner before the Fed Cup semifinal clash of Switzerland versus Belarus, and this time paired up with Bacsinszky to enter the inaugural Ladies Open Biel Bienne.

[99] In the clay-court season, Hingis and Chan continued their good form to win back-to-back titles at the Madrid and Italian Opens, defeating Tímea Babos and Andrea Hlaváčková and Ekaterina Makarova and Elena Vesnina respectively, in the finals of each event.

[108][109] However, like the French Open two months previous, Hingis and Chan could not replicate the success at Grand Slam level: losing at the quarterfinal stage to Grönefeld and Peschke at Wimbledon.

[111] As top seeds they reached the final without losing a set,[112][113][114][115] before defeating defending champions Heather Watson and Henri Kontinen in the championship match.

[120] Jamie Murray and she defeated Chan Hao-ching and Michael Venus in the final to capture their second consecutive title together and remain undefeated as a pair.

Hingis compensated for her lack of power with superior movement, anticipation, finesse, point construction, shot selection, and knowledge of the geometry of the court.

By winning the 1998 US Open title, Hingis completed the doubles Career Grand Slam, becoming the 17th female player in history to achieve this, as well as the youngest.

Chris Evert (1975/1985 – 260 w) Evonne Goolagong (1976 – 2 w) Martina Navratilova (1978/1987 – 331 w) Tracy Austin (1980 – 22 w) Steffi Graf (1987/1997 – 377 w) // Monica Seles (1991/1996 – 178 w) Arantxa Sánchez Vicario (1995 – 12 w) Martina Hingis (1997/2001 – 209 w) Lindsay Davenport (1998/2006 – 98 w) Jennifer Capriati (2001/2002 – 17 w) Venus Williams (2002 – 11 w) Serena Williams (2002/2017 – 319 w) Kim Clijsters (2003/2011 – 20 w) Justine Henin (2003/2008 – 117 w) Amélie Mauresmo (2004/2006 – 39 w) Maria Sharapova (2005/2012 – 21 w) Ana Ivanovic (2008 – 12 w) Jelena Janković (2008/2009 – 18 w) Dinara Safina (2009 – 26 w) Caroline Wozniacki (2010/2018 – 71 w) Victoria Azarenka (2012/2013 – 51 w) Angelique Kerber (2016/2017 – 34 w) Karolína Plíšková (2017 – 8 w) Garbiñe Muguruza (2017 – 4 w) Simona Halep (2017/2019 – 64 w) Naomi Osaka (2019 – 25 w) Ashleigh Barty (2019/2022 – 121 w) Iga Świątek (2022/2024 – 125 w) Aryna Sabalenka (2023/2024 – 9 w)