2010–13: Beginnings, Two Junior Major doubles finals In the beginning of her career, Haddad Maia received part of her training as an athlete first at the
Esporte Clube Sírio and then at the
Esporte Clube Pinheiros, both in São Paulo. Then, in 2010, she moved to
Camboriú, in
Santa Catarina, to work at the academy of
Larri Passos, mentor and former coach of
Gustavo Kuerten, going to live alone at only 14 years old. In the doubles competition, she reached the third round with Croatian partner
Ana Konjuh, losing to
Chan Hao-ching and
Monica Niculescu. She gained her first direct acceptance at a WTA Tour tournament at the
Korean Open. Haddad reached her first tour-level singles final at the tournament, losing to
Jeļena Ostapenko.
2018: Injury and hiatus After the Australian Open, she played for
Brazil at the
American Fed Cup Zone six rubbers between both singles and doubles and won five of them.
2019–20: Doping suspension and return Haddad Maia qualified for the
Australian Open, reaching the second round of the main draw. She also reached the quarterfinals, as a qualifier, at the WTA Tour event in
Acapulco in late February, losing to eventual champion
Wang Yafan. Again out of the qualifying, Haddad Maia reached the semifinals at the
Copa Colsanitas, losing to eventual champion
Amanda Anisimova. After retiring due to injury in the first round of qualifying at the
French Open, she played a WTA Challenger event in Bol, Croatia during the second week of the French Open in early June. In July 2019, she was provisionally suspended by the ITF for testing positive for
ostarine (SARM S-22) and
ligandrol (LGD-4033) at the event in Bol. In February 2020, Haddad Maia was served with a ten-month ban for the period July 2019 to May 2020 for unintentional use of the banned substances, as she was able to prove that the sources were contaminated supplements that she had been prescribed by her sports medicine specialists. The judgement declared that she bore "No Significant Fault or Negligence" for the violation, but given prior similar cases involving Brazilian players such as
Marcelo Demoliner,
Thomaz Bellucci and
Igor Marcondes, the ITF determined that she should have been aware of the risks of using supplements and therefore issued her with the ban. Having dropped to a ranking of 1342 during the suspension, she could not compete in that major event, having to start again in small tournaments. After widespread cancellation of tournaments due to the COVID-19 pandemic, she returned to play in September 2020 at the ITF event of Montemor-o-Novo in Portugal. Haddad won the title and three more on Portuguese soil in the next month. A hand injury led to an
enchondroma diagnosis and forced her to go through a season-ending surgery.
2021: Indian Wells fourth round, back to top 100 In October, at the rescheduled
Indian Wells Open, Haddad lost in qualifying but was awarded a spot in the main draw following the withdrawal of 29th seed Nadia Podoroska. She upset
Karolína Plíšková to advance to the fourth round. The performance was enough to return to the top 100.
2022: Major doubles & WTA 1000 singles finals She played doubles at
Melbourne with
Anna Danilina, and they reached the final, making Haddad only the third Brazilian woman in a final of a Grand Slam tournament, after Maria Bueno and Cláudia Monteiro. Haddad Maia rose to No. 40 in the WTA doubles rankings. Her best performance after the Australian Open was in the
Monterrey Open, reaching the semifinals, where she lost to eventual champion
Leylah Fernandez. Haddad also managed another upset over a top-5 player at the
Miami Open, beating world No. 3,
Maria Sakkari, to reach the third round on a WTA 1000 level for the third time in her career. In May, she won her first WTA 125 tournament, the
Open de Saint-Malo, defeating
Anna Blinkova in the final, and she won the doubles at the
Trophee Lagardère in Paris with Mladenovic while also being runner-up in the singles to
Claire Liu. As a result, Haddad Maia surpassed her previous career-high of 57 in the singles rankings with No. 49, becoming the first Brazilian in the top 50 since Teliana Pereira in 2015. Haddad won her biggest singles title at the WTA 250
Nottingham Open, while also winning the doubles tournament alongside
Zhang Shuai. The results boosted her to the top 40 in the singles and top 30 in doubles rankings. She followed this victory up with facing Zhang in the final of the
Birmingham Classic where Haddad won her second singles title, when the Chinese retired in the first set. The title propelled her into the top 30 in singles for the first time in her career. She joined
Ons Jabeur who won in Berlin less than an hour earlier, and
Iga Świątek as players to win multiple tour titles in the season. She was also the first Brazilian to win in the tournament 40-year history.
Gisele Miró had the best previous result by a player from Brazil, reaching the second round in 1989. When Haddad lost her
Eastbourne International semifinal match to
Petra Kvitová, she had 12 wins and a walkover, the longest winning streak on grass courts since
Serena Williams a decade earlier. Despite impressive form in the warm-up grass-court tournaments, she lost in the first round of
Wimbledon. Ranked No. 24 in singles at the start of the
Canadian Open, she reached the final by defeating
Martina Trevisan, Leylah Fernandez, Iga Świątek, and
Belinda Bencic. As a result, she reached the top 20 in the singles rankings, on 15 August 2022. Haddad then breezed past former No. 1, Karolína Plíšková, to become the first Brazilian woman ever to reach a WTA 1000 final. She lost the final against Simona Halep, in three sets. At the
WTA 1000 Guadajalara Open, Haddad and Danilina reached the final, and she became the first Brazilian woman in history to qualify for the
WTA Finals. Thanks to this result, she also entered the world's top 15 in doubles for the first time. In an unprecedented Brazilian final at the WTA 1000 level against
Luisa Stefani and
Storm Sanders, they ended runners-up in a tight result, with a deciding [10–8] in favour of Stefani/Sanders. Haddad Maia finished the season being awarded by the WTA as
Most Improved Player of 2022.
2023: WTA 1000 doubles title, top 10, Major singles semifinal At the
WTA 500 in Abu Dhabi, she stood in the quarterfinals after more than a three-hour battle with
Yulia Putintseva. Next, she reached the semifinals by defeating
Elena Rybakina and recording a six-match winning streak against top-10 players. She lost the semifinal match to Belinda Bencic in straight sets. Nevertheless, she moved to a career-high ranking of No. 12 on 13 February 2023. Playing with
Laura Siegemund, Haddad reached her second WTA 1000 doubles final in
Indian Wells. She won her first WTA 1000 doubles title at
Madrid with
Victoria Azarenka, defeating
Jessica Pegula and
Coco Gauff in a final that was followed by controversy as none of the participating players were allowed to make a speech on the podium during the awards ceremony. The organizers subsequently apologized for the mistake. As a result, she reached the top 10 in the doubles rankings on 8 May 2023. At the
Italian Open, Haddad Maia reached quarterfinals at a WTA 1000 level for the second time. She was close to qualifying for the semifinals, but in an extremely long match lasting 3 hours and 41 minutes, the longest of the season, she lost to
Anhelina Kalinina. Still in the first set, Haddad felt an injury to her left leg, which ended up limiting her movement in decisive moments of the game. At the
French Open, she became the first Brazilian woman to reach the semifinals since Maria Bueno in 1966. Haddad lost the semifinal to top seed and world No. 1, Iga Świątek. She entered the top 10 in singles on 12 June 2023, becoming the first Brazilian woman to reach this milestone since the introduction of the WTA rankings. At the
Eastbourne International, she won the first match but was forced to retire from her match against
Petra Martić, still due to her knee injury with the score at 4–6, 2–3. She made up for these losses by having the best campaign of her career at
Wimbledon. Haddad won the first three matches and reached the fourth round, during which she was forced to retire due to a lower back injury. At the
US Open, she advanced into the doubles quarterfinals, before losing in a close match to former champions Laura Siegemund and
Vera Zvonareva. Haddad won both tournaments at the
2023 WTA Elite Trophy, becoming the first player to win both titles at the Elite Trophy's history and also to do so in the same edition of the tournament. In doubles she partnered with
Veronika Kudermetova and together they defeated Miyu Kato and Aldila Sutjiadi in the final with a score of a double 6–3. At the singles draw she defeated Zheng Qinwen in two sets that went to a tiebreak. She finished the season at No. 11, her best end of the season ranking.
2024: First WTA 500 singles title, Olympics debut, US Open quarterfinalist Her first competition of the season was representing Brazil in the
United Cup in Perth, Australia, a mixed team competition for countries. Haddad's evolution in the previous season was decisive for Brazil to qualify for this tournament for the second consecutive time. Although the team's performance was not good and Brazil was disqualified in the group stage, the Brazilian No. 1 was the only one to record a win for the team in the women's singles match against
Sara Sorribes Tormo in straight sets. Haddad participated in the
Adelaide International and formed a partnership with
Taylor Townsend in the doubles bracket. They won the tournament title beating
Caroline Garcia and
Kristina Mladenovic, in straight sets in the final. Haddad had a direct entry into the
Australian Open. In the singles main draw, as No. 10 seed, she got past
Linda Fruhvirtová in the first round in a three-set match, then defeated
Alina Korneeva in the second in straight sets, becoming the first Brazilian to advance to the third round in Australia in the
Open era and the first since
Maria Bueno in 1965, but then lost to qualifier
Maria Timofeeva, in straight sets. In the doubles, keeping partnership with Townsend and as No. 8 seeds, they reached the round of 16, before falling to
Cristina Bucșa and
Alexandra Panova, also in straight sets. As a result, Haddad returned into the top 20 of the doubles rankings, gaining three places. For the
Abu Dhabi Open, in preparation for the
2024 Paris Olympics, Haddad decided to partner with compatriot Luisa Stefani, as both have the rankings to play the doubles tournament together, and previously won two ITF tournaments in 2019. She reached both semifinals of Abu Dhabi, but after losing a long match to
Daria Kasatkina, she pulled out of the doubles match the following day. Her next tournament was the
Qatar Ladies Open where she lost in the first round to
Wang Xinyu, in straight sets. In August, at the
Cleveland Open, she reached her sixth WTA Tour final, defeating qualifier
Viktorija Golubic, Cristina Bucșa,
Clara Burel, and third seed Kateřina Siniaková before losing to wildcard entrant
McCartney Kessler. Haddad Maia won her first WTA 500 singles title at the
Korea Open, defeating three Russian players, sisters
Polina and Veronika Kudermetova in the same day and then Kasatkina in the final, in three sets.
2025: Second Nottingham doubles title Haddad Maia began her 2025 season representing Brazil in the
2025 United Cup, held in Perth, Australia. In her first match, she faced the Chinese player
Gao Xinyu, ranked 175th in the world. Haddad suffered a dramatic defeat in a match lasting 3 hours and 20 minutes. She lost in three sets, after experiencing severe cramping that forced her to serve underarm in the decisive moments. In Brazil's second tie of the event, Haddad faced Laura Siegemund of Germany and lost in straight sets. Brazil was eliminated, after suffering additional defeats in singles and mixed doubles, concluding the United Cup without advancing through the group stage. Next, Haddad participated in the WTA 500
Adelaide International where she was seeded 15th in the singles draw. Suffering a two-set loss against
Madison Keys in the first round, marked her worst start to a season in four years. At the same tournament, Haddad and Siegemund finished
runners-up losing the final to
Guo Hanyu and
Alexandra Panova. Haddad Maia, again partnered with Siegemund, reached the semifinals at the
2025 Qatar TotalEnergies Open and the quarterfinals at the
2025 Dubai Tennis Championships, the round of 16 at
2025 BNP Paribas Open in Indian Wells and the quarterfinals in
2025 Mutua Madrid Open. Additionally, she partnered with Luisa Stefani to play and win against Linda Nosková and
Tereza Valentová in the
2025 Billie Jean King Cup. Also at the
Australian Open, she played at both singles and doubles competitions. In singles, she faced Argentine player
Julia Riera and won in three sets. This match marked her first singles win of the 2025 season. Advancing to the second round, she competed against
Erika Andreeva, winning in straight sets. With this victory, Haddad equaled the best performance by a Brazilian in the
Open Era. In doubles, she partnered again with Siegemund. In the first round, they beat
Suzan Lamens and
Quinn Gleason in straight sets. Her run at the
Australian Open would end in the third round of both singles and doubles. In singles, she lost to Veronika Kudermetova in straight sets, and in doubles, she and Siegemund were defeated by
Erin Routliffe and
Gabriela Dabrowski, in three sets. In her next eight singles matches, Haddad would not get a single win, losing to
Magdalena Fręch in
Qatar,
Anastasia Potapova in
Dubai,
Rebecca Šramková at the
2025 Mérida Open,
Sonay Kartal at Indian Wells, Linda Fruhvirtová at the
2025 Miami Open,
Linda Nosková and
Jéssica Bouzas Maneiro in the
BJK Cup and
Emma Navarro at the
2025 Stuttgart Open. Haddad would only win again in singles matches against
Bernarda Pera in the first round of the
Madrid Open. Despite that, Haddad Maia would lose her second match against Belinda Bencic, and at the
2025 Italian Open against Marie Bouzková in her opening match. In her next tournament, the
2025 Internationaux de Strasbourg, she delivered her best singles performance of the 2025 season so far, reaching the semifinals and losing to Elena Rybakina in a hard-fought three-set match. Haddad's next tournament was the
French Open, where she lost to
Hailey Baptiste in the first round, in a three-set match. However, in the doubles draw, she again played alongside Siegemund and delivered the best performance on that tournament in her career so far, reaching the round of 16 for the first time ever, but losing to the Italians
Sara Errani and
Jasmine Paolini, the eventual tournament's champions. Haddad Maia then went to play on
grass court tournaments. First, she went to London and played at the
Queen's Club Championships. In
singles, she won her first match in a comeback win in three sets, facing former world No. 2 and Wimbledon champion,
Petra Kvitová, marking their third encounter. In the second round, she faced
Emma Navarro in their third encounter of the season and the first ever on grass. Navarro won in three sets. In the doubles competition, she participated alongside
Cristina Bucșa and together they were defeated in the first round by the Kazakh pair of Yulia Putintseva and Elena Rybakina. Haddad then went to play at the
Nottingham Open to fight for her second title in singles and doubles at that tournament. In singles, she had her second encounter against
McCartney Kessler in the opening round and lost in a 2 hours and 50 minutes three-set match. In doubles, she continued her partnership with Siegemund and together they were the champions, winning their first title together in their third final and Haddad's first trophy of the season, playing against
Anna Danilina and
Ena Shibahara in the decisive match and getting their victory in straight sets. For the second time in her career, Haddad Maia was a two-time champion of a WTA tournament in doubles. This was her eighth title in doubles on WTA Tour and the second on grass. It was her fourth title on grass, also considering those played in the singles draws. In Germany at the
2025 Bad Homburg Open, she only played in the singles draw and reached the quarterfinals but lost to
Jasmine Paolini in straight sets. In
Wimbledon, Haddad lost in the second round to
Dalma Gálfi, and while she reached the third round in doubles, Siegemund's progress in the singles draw forced them withdraw from the tournament. Following an up and down summer on the hardcourt swing, she delivered a spirited run at the
2025 US Open where her campaign ended in the fourth round with a straight-set loss to
Amanda Anisimova. She then played at
the inaugural SP Open, a WTA 250 at her hometown of
São Paulo, in September, entering as the tournament's top seed. She fell in the quarterfinals to
Renata Zarazúa. She also participated in the doubles draw, playing alongside Brazilian
Ana Candiotto. They lost in the first round to fellow Brazilians and eventual runner-ups
Laura Pigossi and
Ingrid Martins. After losing in the second round of the
Korea Open, Haddad decided to make a pause on her career to take care of her mind and body health and publicly stated on her social media accounts that she would only return to competitions in 2026. During this period, she underwent an
egg freezing procedure, citing her long term goal of becoming a mother. The process was supported by a Women’s Tennis Association (WTA) policy that allows players to retain a protected ranking while undergoing fertility preservation. In October, Haddad was part of the “September shot of the month” poll on WTA's Instagram account, competing with a shot she performed at the
SP Open on her win against
Miriana Tona. Haddad Maia ended up being the most voted of the poll and was chosen as the winner. In December, that same shot was one of the chosen to be in the poll on WTA's Instagram account for the “Shot of the year”.
2026: Back to the WTA Tour In January, after a couple of months away from the WTA Tour to take care of her body's and mind's health, Haddad Maia entered the main draw in singles at the
Adelaide International with a protected ranking of No. 30. She played
Victoria Mboko and lost in the first round. Then, Haddad Maia went on to play at the
Australian Open, where she faced Yulia Putintseva in the first round and lost in three sets. Next, Haddad Maia played at the
Abu Dhabi Open and lost to
Dayana Yastremska in two sets at the first round. Ranked in the top 70, Haddad Maia received a wildcard for playing at the qualifying rounds of the
Qatar Open. In the first round she got her first victory of the season, by beating Qatari player Mubaraka Al-Naimi with a
double bagel. In the second round she faced
Anastasia Zakharova and lost in straight sets, however she got to be a lucky loser and played in the main draw. In the first round she faced
Janice Tjen and lost in straight sets. Shortly after, Haddad Maia decided to end the partnership with her coach Rafael Paciaroni after six years of working together. After ending her partnership with Paciaroni, Haddad Maia went to the tournaments accompanied by her mother Lais. Haddad Maia's next tournament was the
2026 Mérida Open, where she lost at the first round in straight sets against
Katie Boulter. After that, Haddad Maia played at the
2026 BNP Paribas Open in Indian Wells and lost at the first round in three sets against
Jessica Bouzas Maneiro. The following week, Haddad Maia played on a
WTA 125 in Austin. She faced Linda Fruhvirtová on the first round and lost in three sets. Next she played at the
Miami Open and lost in two sets to
Zeynep Sönmez at the first round. The following weeks, Haddad Maia was scheduled to play at the
2026 Credit One Charleston Open and at the
2026 Billie Jean King Cup, but decided to withdraw from those tournaments. After almost fifty days without a coach, it was announced that Carlos Martinez Comet would be Haddad Maia's next coach. Martinez Comet had previously worked with players such as
Svetlana Kuznetsova,
Daria Kasatkina and
Lois Boisson. Haddad Maia's first tournament working with new coach Carlos Martinez Comet was the
Oeiras Ladies Open, a
WTA 125 level tournament in
Oeiras, Portugal. In her opening match, Haddad Maia got her first win of the season in a main draw of a tournament, over Portuguese player
Francisca Jorge in straight sets. This was also the first main draw win for Haddad Maia in seven months, dating back to September 2025. ==Endorsements==