Early years During the 2001 Australian Open Junior Grand Slam event, Hsieh reached the girls' singles quarterfinals and the round of 16 in the girls doubles event with partner Natalie Ko, Although she was knocked out in the first round of the singles tournament by her close friend and partner
Peng Shuai, she and Chuang reached the quarterfinals in doubles, where they were beaten by the eventual silver medalists
Andrea Hlaváčková and
Lucie Hradecká. She also posted another solid result in singles, reaching the third round before falling to Plíšková. During the summer hardcourt season, Hsieh struggled in both singles and doubles. Her best showings came in singles at the
Washington Open, where she lost to young American
Caty McNally in the quarterfinals, and the third round of the Premier 5
Cincinnati Open, losing to Osaka in three sets in the pairs third meeting of 2019. At the US Open, she lost to Wimbledon quarterfinalist
Karolína Muchová in the second round in singles, while in doubles she and Strýcová were beaten in the third round by Kichenok and Ostapenko. Nonetheless, Hsieh and Strýcová became the first doubles team to qualify for the
2019 WTA Finals during the US Open. Hsieh posted mixed results during the Asian hardcourt season for singles and doubles. Her best singles result came at the Japan Women's Open, where she was the defending champion and the number-one seed for the first time in a WTA Tour singles tournament in her career. However, she was upset by
Nao Hibino in the quarterfinals. In doubles, she made the final of the
Pan Pacific Open with her sister Hsieh Yu-chieh, where they were beaten by fellow-Taiwanese siblings
Latisha Chan and
Angel Chan. However, she and Strýcová came into the WTA Finals on a three-match losing streak after posting consecutive first-round losses in Wuhan and Beijing. Seeded second, the pair dropped their opening match to Dabrowski and Xu, but beat
Barbora Krejčíková and
Kateřina Siniaková, and Stosur and Zhang in their next two matches to finish first in the Purple Group. They defeated the No. 8 seeds, Anna-Lena Grönefeld and
Demi Schuurs, in the semifinals, but were beaten by the defending champions, Babos and Mladenovic, in the final. Hsieh finished the year ranked No. 32 in singles and No. 4 in doubles, her first top 10 finish since 2014.
2020: Back to No. 1 in doubles Hsieh and Strýcová won the first tournament of the year at
Brisbane. They followed that up with an appearance in the final at the
Australian Open, where they lost to Babos and Mladenovic. Two more tournament victories followed in February: at
Dubai and
Doha. As a result, Hsieh regained her No. 1 doubles ranking for the first time since 6 July 2014. Her gap of five years, six months and 28 days between No. 1 doubles rankings is the second-longest in history, after
Martina Hingis' gap of 15 years, nine months, and 30 days from March 2000 to January 2016.
2021: First major singles quarterfinal, third Wimbledon and Indian Wells doubles titles Hsieh began the year at the Abu Dhabi Open, where she partnered with Krejčíková, and was upset by Aoyama and Shibahara in the quarterfinals. After a first-round loss at the Melbourne Open, she entered the Australian Open in both singles and doubles, pairing again with Strýcová. While the veteran pair were upset in the second round by the unseeded team of
Darija Jurak and
Nina Stojanović, Hsieh defeated qualifier
Tsvetana Pironkova, US Open champion Bianca Andreescu, and French Open finalists Sara Errani and
Markéta Vondroušová to reach her first Grand Slam tournament quarterfinal in singles. At age 35, she became the oldest debutante at a major quarterfinal, where she lost to Naomi Osaka in straight sets. At
Wimbledon, Hsieh and Mertens won the doubles title for the third time, beating
Veronika Kudermetova and Elena Vesnina in the final, after saving two championship points. In
Indian Wells, Hsieh and Mertens won the doubles title, defeating Kudermetova and
Elena Rybakina in the final. It was Hsieh's third Indian Wells doubles title, each with a different partner, and her 12th
WTA 1000 title overall. Following Indian Wells, she returned to No. 1 in doubles (since September 2021). Hsieh and Mertens qualified for the
WTA Finals in doubles. They reached the final, but lost to Krejčíková and Siniaková, in straight sets. Hsieh finished the year ranked world No. 3 in doubles. Before the WTA Finals, she wrote on her Facebook page that she was taking an extended break after the Finals to heal an injury.
2023: Return to the WTA Tour, second French Open title and fourth Wimbledon title Hsieh made a return to the tour at the
Madrid Open with partner
Barbora Strýcová, using a protected ranking. The pair reached the quarterfinals before losing to
Leylah Fernandez and Taylor Townsend, returning Hsieh to the WTA rankings at 355th in the world. She followed this with a round-one loss in
Rome, again partnering with Strýcová, and a second-round loss in
Strasbourg with
Wang Xinyu. In her fourth tournament back, she and Wang joined to play the
French Open. The pair upset defending champion Kristina Mladenovic, who was playing with Zhang Shuai this year in the second round, then beat fifth seeds
Desirae Krawczyk and Demi Schuurs in the third round. In the quarterfinals, they beat Veronika Kudermetova and
Liudmila Samsonova to advance to the semifinals. There, they beat sixth seeds
Nicole Melichar-Martinez and
Ellen Perez to advance to their first final as a pair, and Hsieh's first final since her return to tennis. In the final, they came back from a one-set deficit to win the title, beating Fernandez and Townsend in three sets. This was Hsieh's second French Open doubles crown, her fifth Grand Slam title overall, and her 31st career doubles tournament win. After the tournament, Hsieh's ranking skyrocketed from 286th to No. 29 in the world. On July 16, Hsieh won her fourth
Wimbledon doubles title with Strýcová by defeating
Storm Hunter and Elise Mertens in the final.
2024: Singles retirement, mixed doubles & doubles champion in Australia, Wimbledon mixed doubles title On December 31, 2023, Hsieh announced that the
2024 Australian Open would be her final Grand Slam tournament in singles, a career spanning more than two decades. While some expected Hsieh to be granted a main-draw wildcard for her final tournament, Australian Open organizers refused, and she was forced to play in qualifying. Hsieh's career in singles ended in the first round of qualifying, falling in straight sets to the No. 11 seed Anna Bondar. At the same tournament, she reached for the first time a final in
mixed doubles. With
Jan Zieliński, she won her first mixed-doubles title defeating second seeds
Desirae Krawczyk and
Neal Skupski. They saved a championship point en route to Hsieh's seventh major title (and her first on hardcourts) and Zieliński's first. Zieliński became the first Polish champion and finalist at a mixed-doubles event. She also reached the final in
doubles with former partner Elise Mertens, defeating third-seeded pair of current world No. 1, Storm Hunter, and former world No. 1 and defending champion, Katerina Siniaková. In the final, they defeated
Jeļena Ostapenko and
Lyudmyla Kichenok for her eighth major title. In March, after announcing her retirement in singles at the majors, Hsieh participated in the singles qualifying competition at the WTA 1000
Indian Wells Open, using protected ranking. At the same tournament with Mertens, she won the doubles title for the fourth time, her 34th title overall, defeating former world No. 1 players, Hunter and Siniaková. She reached the mixed-doubles semifinals at the
French Open with Zieliński where they lost to
Desirae Krawczyk and
Neal Skupski. In June, Hsieh and Mertens won the
Birmingham Classic, defeating
Miyu Kato and Zhang Shuai in the final. At
Wimbledon, she reached another final in mixed doubles with the same partner, Jan Zieliński. They won the title, defeating Mexican duo
Giuliana Olmos and
Santiago González in the final. With
Tsao Chia-yi, she reached the quarterfinals at the
Paris Olympics, defeating Romanian duo
Irina-Camelia Begu and
Monica Niculescu and Ukrainians
Marta Kostyuk and
Dayana Yastremska. They lost to Czech pairing,
Karolína Muchová and
Linda Nosková. With Elise Mertens, Hsieh qualified for the end-of-season
WTA Finals but exited in the group stages after compiling a record of one win and two losses.
2025: Australian and Wimbledon doubles finals Partnering Jeļena Ostapenko, Hsieh reached the doubles final at the
Australian Open, losing to top seeds Siniaková and Townsend in three sets. The pair also made the final of the
Dubai Tennis Championships, losing to Siniaková and Townsend again. Hsieh then partnered up with Zhang Shuai at
Indian Wells, but could not defend her title, as they lost in the semifinals to
Olivia Nicholls and
Tereza Mihalíková. Hsieh would continue to reach the latter stages of tournaments without managing to win a title, including the semifinals of the
Madrid Open with Ostapenko, the semifinals of the
Nottingham Open with Zhang, and the final of the
Eastbourne Open with Australian
Maya Joint. Hsieh and Ostapenko entered
Wimbledon as the fourth seeds, and sealed a place in the final with a win over Siniaková and Townsend, avenging her semifinal defeat against the pair at last year's event. Despite being down a set, it was Veronika Kudermetova and Elise Mertens who triumphed in the final. Hsieh then made the
Canadian Open semifinals in her first appearance at the event in six years, partnering
Olga Danilović. Hsieh opted to partner with
Ashlyn Krueger as opposed to Ostapenko for the
US Open. They exited in the first round to 13th seeds
Cristina Bucșa and
Nicole Melichar-Martinez. Hsieh and Ostapenko rejoined for the
China Open, where they made a run to the semifinals, before being eliminated by second-seeded Errani and Paolini, 6-4, 6-0. At the Ningbo Open, Hsieh teamed up with Siniaková, the reigning world number one in doubles. They were upset in the semifinals by Melichar-Martinez and Samsonova. Hsieh and Ostapenko were the sixth team to qualify for the
WTA Finals, and were the only team to do so without winning a title. Despite this, they recorded a 3-0 record in group play, avenging their Wimbledon final defeat with a win over Kudermetova and Mertens, upsetting top seeds Errani and Paolini, and easing past eighth-seeded
Asia Muhammad and
Demi Schuurs. They could not capitalize on this momentum in the knockout rounds, as they were eliminated in the semifinals by
Timea Babos and
Luisa Stefani in straight sets. Hsieh ended the year ranked ninth in doubles. She reached four finals, including two Grand Slam finals, but could not win any. She and Ostapenko decided to continue their partnership into 2026.
2026 Prior to the start of the season, Hsieh's longtime coach,
Paul McNamee, announced the end of their partnership in order to coach fellow Australian
Ellen Perez, ending a 14-year collaboration. Hsieh and Ostapenko then beat Perez and Bucsa in the final of the
Brisbane International, their first title as a pair, 6-2, 6-1. ==Career statistics==