Representing Brazil, she partnered with Laura Pigossi to defeat Veronika Kudermetova and defending gold medalist Elena Vesnina in the bronze medal match.

190, and had only played together once previously, a defeat at the 2020 Fed Cup, and yet became the first Brazilians to win an Olympic tennis medal, surpassing the performance of Fernando Meligeni that took 4th place in men's singles in 1996.

The doubles kept being more productive, and once an invitation to make her tour debut in the 2019 Monterrey Open with Giuliana Olmos led to the semifinals and a ranking increase, she decided to stop playing singles to have more chances at appearing in bigger events.

Soon afterward, Stefani made her Grand Slam main-draw debut at French Open, partnering Australian Astra Sharma in doubles.

After that, Stefani established a fixed partnership with Carter.At the 2019 Pan American Games in Lima, Luisa won a bronze medal alongside Carolina Meligeni Alves.

[10] It has been 38 years since a female doubles player from Brazil have gone as far in a Grand Slam tournament (the last time that Brazilians were in the quarterfinals was in Wimbledon in 1982: Patricia Medrado and Cláudia Monteiro).

Pigossi and Stefani became the first Brazilians in history to obtain an Olympic medal in tennis, surpassing Fernando Meligeni's campaign that took 4th place in 1996.

[14] Following the Olympics, seeded fifth, Stefani won her first WTA 1000, partnering Dabrowski, at the Canadian Open avenging their loss in the Silicon Valley Classic final to Darija Jurak and Andreja Klepač.

[15] The following week, they followed this successful run by another, reaching the WTA 1000 final at the Cincinnati Open by defeating current Olympic champions, second seeded pair of Krejciková and Siniaková.

[16] The US Open had Stefani reaching her first major semifinal and fifth straight in 2021, partnering with Gabriela Dabrowski, only to injure her knee in the decisive game against Coco Gauff and Caty McNally and withdraw.

[2][19] After nearly a year of recovering from her knee injury, Stefani announced her return to play at the Pan Pacific Open in Tokyo in September, partnered with Ena Shibahara.

[citation needed] Partnering Ingrid Martins, Stefani won the doubles title at the WTA 125 Montevideo Open, defeating Quinn Gleason and Elixane Lechemia in the final.

[29] Also during the Australian Open, Stefani and Brazilian partner Rafael Matos were crowned champions, after defeating the Indian duo of Sania Mirza and Rohan Bopanna in straight sets.

[37] Still with Garcia, Stefani reached the quarterfinals of Wimbledon, along the way defeating sixth seeds Leylah Fernandez and Taylor Townsend, and former doubles world No.

[38] Stefani made the Cincinnati quarterfinals, partnering Anastasia Pavlyuchenkova,[39] and upon her return to the US Open, alongside Jennifer Brady, repeated the semifinal that preceded her injury.

[54] In October, after falling in round 1 of the 2024 Wuhan Open,[55] even if the pair was still in the chase for the 2024 WTA Finals, Stefani declared she was ending her season sooner due to knee pain.

Originally on a break, Stefani was called to Riyadh, Saudi Arabia to serve as an alternate with Demi Schuurs, ready to participate if needed in the doubles competition.

[65][66][67][68] Also in January, she signed a sponsorship deal with the Brazilian sportswear company Slyce, expressing enthusiasm about wearing and representing a local brand.

In their second round match, Stefani and Stearns faced Zhang Shuai from China and Kristina Mladenovic from France and, with a score of 2/6 2/6, they lost and got eliminated from the Australian Open.

[76][77][78] In her next tournament, the 2025 Upper Austria Ladies Linz, Stefani was scheduled to play alongside fellow Brazilian Ingrid Martins but with a strong entry list, they would be alternates.

Babos and Stefani won in the semifinal by beating the number one seeded pair of Zhang Shuai from China and Kateřina Siniaková from the Czech Republic.

[79] The Brazilian-Hungarian pair won the title in a comeback victory and defeating the Ukrainian twin sisters Lyudmyla and Nadiia Kichenok in the final, which went to a deciding champions tiebreak.

[82][83] Only main-draw results in WTA Tour, Grand Slam tournaments, Fed Cup/Billie Jean King Cup and Olympic Games are included in win–loss records.