In 2021, Bencic won her biggest career title by claiming the gold medal at the Tokyo Olympics, also winning silver in the women's doubles.

Her parents were both born in Czechoslovakia, but her father's family emigrated to Switzerland in 1968 to escape the Warsaw Pact invasion by the Soviet Union.

[5] Around this time, her father also asked Marcel Niederer, a childhood friend and fellow hockey player who had become an entrepreneur, if he could help sponsor his daughter's career.

Niederer agreed to invest in Bencic, which gave her father the ability to quit his job so he could spend more time traveling with and coaching his daughter while she competed at tournaments.

[19] She also had a third Grand Slam runner-up finish in doubles at the US Open, losing to the Czech team of Krejčíková and Kateřina Siniaková alongside Sara Sorribes Tormo.

Bencic made her WTA Tour qualifying draw debut at the Luxembourg Open towards the end of the year in October, losing in three sets to Yulia Putintseva.

She received a wildcard into the main draw at the following year's event, where she lost her WTA Tour main-draw debut to Venus Williams.

Her best results in the first half of the year were a singles semifinal at the $50k Indian Harbour Beach Pro Tennis Classic in the United States and a doubles title at the $25k event in Lenzerheide, Switzerland.

She defeated Kimiko Date-Krumm in the first round in a matchup of the oldest and second-youngest players in the draw before losing to the eventual champion Li Na in her next match.

[27][28][29] Bencic did not win another main-draw match until April when she made it to the semifinals as a qualifier at the Charleston Open in her first clay court event of the year.

After finishing runner-up to Camila Giorgi at the Rosmalen Championships,[38] she won the Eastbourne International over Agnieszka Radwańska for her maiden WTA title.

During the event, she recorded two more top ten victories, including a fourth over Wozniacki, before finishing runner-up to Radwańska in their second final of the year.

She retired from her second-round match at Miami[52] and was forced to miss nearly the entire clay-court season due to a back injury, including the French Open.

[85][86] At the 2020 Tokyo Olympics, Bencic beat Jessica Pegula, Misaki Doi, French Open champion Barbora Krejčíková and Anastasia Pavlyuchenkova to reach the semifinals.

[91] Bencic entered the Charleston Open as tenth seed and defeated Wang Xiyu, Linda Fruhvirtová and Madison Keys to reach the quarterfinals.

At the WTA 1000 Canadian Open, she defeated qualifier Tereza Martincová, Serena Williams, who was playing under a protected ranking, and Garbiñe Muguruza to reach the quarterfinals.

[97] At the Australian Open, she defeated Viktoriya Tomova,[98] Claire Liu[99] and Camila Giorgi[100] to reach the round of 16 in which she lost to fifth seed and eventual champion Aryna Sabalenka.

[101] Her next tournament was the Abu Dhabi Open where, as second seed, she defeated Marta Kostyuk,[102] qualifier Shelby Rogers[103] and Beatriz Haddad Maia[104] to make her 17th final overall and second of the season.

[120] She then helped Switzerland defeat Serbia in the Billie Jean King Cup play-offs, winning her singles match against Lola Radivojević and teaming with Jil Teichmann to overcome Natalija Senić and Anja Stanković in the doubles.

[131][132][133] Partnering fellow Swiss player Céline Naef, Bencic was also runner-up in the doubles at the same tournament, losing to Monica Niculescu and Elena-Gabriela Ruse in the final.

[129] Bencic started her 2025 season representing Switzerland at the United Cup, where she defeated Chloé Paquet and then teamed with Dominic Stricker to overcome Edouard Roger-Vasselin and Elixane Lechemia in the doubles as they beat France in their opening contest.

[134] She lost to Jasmine Paolini as Switzerland were defeated by Italy in their second group tie and subsequently failed to reach the knockout stages.

[135] Bencic qualified for the Adelaide International and was a set up in her first round match against seventh seed Anna Kalinskaya when her opponent retired due to injury.

[137] Using her protected ranking to enter the main draw at the Australian Open, Bencic defeated 16th seed Jelena Ostapenko[138] and Suzan Lamens to reach the third round.

[145] In the semifinals, Bencic fought back from losing the first set to defeat top seed and defending champion Elena Rybakina.

[157] Although Bencic missed the play-off due to injury, Switzerland defeated Poland to return to the top-tier World Group the following year.

Bencic led the team to their 2016 first round over Germany, winning both of her singles matches against Andrea Petkovic and Angelique Kerber as well as the decisive doubles rubber with Martina Hingis.

[169] After Federer defeated Zverev and Bencic lost to Kerber, the Swiss team won the decisive mixed doubles rubber in straight sets for the title.

[170] During the 2019 event, they were upset by the Greek team of Maria Sakkari and Stefanos Tsitsipas in their last round robin tie, but still advanced to the final through the tiebreak criteria.

Bencic became the fifth player to reach two finals at the same Olympic event since tennis returned at the Games in 1988, joining Serena and Venus Williams, Andy Murray and Nicolás Massú.