2009–2012: ITF Tour In 2009, Collins played her first events on the
ITF Women's Circuit. She won her first ITF singles title in 2011.
2013–2017: WTA Tour debut, turning pro She did not play any professional matches in 2013 and 2015 while she was playing college tennis at Virginia. Collins made her
WTA Tour main-draw debut as a wildcard player at the
2014 US Open in the
Arthur Ashe Stadium, where she forced second seed
Simona Halep to a third-setter in the first round. In mid-2016, she turned fully professional. During her time on the ITF Circuit, she won four singles titles.
2018: Breakthrough and top 50 Collins started the year reaching the final round of
qualifying at the
Australian Open, before being outclassed by
Denisa Allertová, in two sets. However, she received a wildcard at the
WTA 125 tournament at
Newport Beach and claimed the title there, which saw her rise to a career-high ranking of No. 120 at that time. Another impressive run at another WTA 125 tournament, this time in
Indian Wells, saw her reach the quarterfinals and thus earn a wildcard for the
Indian Wells Open, a
Premier Mandatory tournament that also takes place there. There, she won her first WTA Tour match, defeating compatriot
Taylor Townsend, before beating world No. 14,
Madison Keys, in straight sets, followed by a victory over
Sofya Zhuk. Although her run ended in the fourth round against former world No. 6,
Carla Suárez Navarro, Collins made her top-100 debut, jumping from No. 117 to 93. Getting through the qualifying rounds at the
Miami Open, Collins beat world No. 37,
Irina-Camelia Begu, in straight sets, before upsetting two-time major semifinalist
CoCo Vandeweghe, in three sets. Victories over
Donna Vekić and
Monica Puig followed, before she earned the biggest victory of her career, beating her idol, former world No. 1 and seven-time Grand Slam champion,
Venus Williams, who was the eighth-ranked player coming into their encounter. With this win, she became the first qualifier ever to reach the semifinals at the Miami Open. She then faced sixth-seeded
Jeļena Ostapenko and lost in straight sets, despite having a set point in the first set. After making it to the quarterfinals in
Monterrey, Collins broke into the top 50 for the first time. Collins won back-to-back main-draw matches at only two other tournaments the rest of the season, reaching the third round of the
Eastbourne International and the semifinals in
San Jose (both Premier-level events) and lost in the opening round at the remaining three Grand Slams. Nonetheless, she finished the year ranked No. 36 in the world, more than 100 spots above her previous best year-end ranking.
2019: Australian Open semifinal, top 25 Her rise continued at the
Australian Open. Prior to the tournament, she had never won a match at a major event. After upsetting 14th seed
Julia Görges in a tough first-round match, Collins won her next three matches in straight sets; first against
Sachia Vickery, then against 19th seed
Caroline Garcia. In the round of 16, Collins pulled off the biggest upset of the tournament, dominating the second seed and three-time major champion
Angelique Kerber, in straight sets. She thus reached the quarterfinals, where she defeated
Anastasia Pavlyuchenkova in three sets. In the semifinals, she lost to eighth seed
Petra Kvitová, in two sets. Collins rose to a career-high ranking of No. 23 on January 28, 2019, following the tournament. She also recorded wins at all the other major events, reaching the second round at the
French Open and
US Open as well as the third round at
Wimbledon. She achieved her best-ever Grand Slam doubles result at
Wimbledon, reaching the quarterfinals with
Bethanie Mattek-Sands. Collins struggled outside of the majors though, reaching the quarterfinals at just one tournament (the
Charleston Open). In December, she won the
Hawaii Open, an exhibition tournament, upon the withdrawal of her finals opponent Angelique Kerber. Collins finished the year ranked world No. 31. At the end of 2019, Collins revealed that she was suffering from rheumatoid arthritis, similar to
Caroline Wozniacki.
2020: French Open quarterfinalist Collins began 2020 with three wins over top-15 opponents. She defeated world No. 5,
Elina Svitolina, in the first round at the
Brisbane International before falling to world No. 13, Madison Keys, in straight sets in the quarterfinals. The following week at the
Adelaide International, she defeated No. 15
Sofia Kenin in the second round, and then No. 7
Belinda Bencic in the quarterfinals. Collins fell to world No. 1,
Ashleigh Barty, in three sets in the semifinals. She lost in the second round to
Yulia Putintseva at the
Australian Open, and dropped outside the top 50 due to failing to defend her semifinalist points. Due to the six-month shutdown of the WTA Tour caused by the
COVID-19 pandemic, Collins did not play again after the Australian Open until August. She lost in the opening round of her first two tournaments back, to
Jil Teichmann at the
Western & Southern Open and
Anett Kontaveit at the
US Open. However, Collins rebounded at the
French Open where she reached her second career Grand Slam quarterfinal. Along the way, she upset two-time Grand Slam champion and former world No. 1,
Garbiñe Muguruza, in the third round (handing the Spaniard her earliest exit from Roland Garros since 2013) as well as 30th seed
Ons Jabeur, both in three sets. Her run ultimately came to an end against compatriot and reigning Australian Open champion, Sofia Kenin, in a match that for both players was their fourth three-setter of five matches.
2021: First WTA Tour title, return to top 30 Danielle Collins was sidelined for the first half of the season with debilitating pain in her back. She was diagnosed with
endometriosis and proceeded to have a "tennis ball-sized" cyst removed. In addition to that surgery, Collins was also taking medication for
rheumatoid arthritis. The following month, she won her second WTA title at the
Silicon Valley Classic, defeating
Daria Kasatkina in three sets. The Silicon Valley Classic win marked her first
WTA 500 title. As a result, she reentered the top 30 at world No. 28, on August 9, 2021. She continued her win streak at the
Canadian Open. She beat
Jil Teichmann in the first round, and went on to defeat sixth seed
Simona Halep in the second. Her 12-match win streak eventually came to an end in the third round, after losing to compatriot
Jessica Pegula, in three sets. At the
US Open, she reached the third round for the first time after defeating former world No. 6, Carla Suárez Navarro, and
Kaja Juvan. She lost her third-round match to
Aryna Sabalenka, in straight sets. In her next two tournaments, Collins reached the quarterfinals in
Chicago and the third round in
Indian Wells before concluding her season in
Linz, where she was forced to retire in her semifinal match against compatriot
Alison Riske due to a shoulder injury. Nonetheless, Collins finished the year ranked inside the top 30 for the first time, at No. 29.
2022: Major finalist, world No. 7, American No. 1 At the
Australian Open, Collins reached the semifinals for the second time, after defeating 19th seed
Elise Mertens to become the third American woman in the quarterfinals. It was the second year in a row that three Americans have featured at this stage of the tournament. In the quarterfinals, she beat
Alizé Cornet in straight sets. She defeated
Iga Świątek also in straight sets in the semifinals to advance to her first Grand Slam final, where she faced world No. 1, Ashleigh Barty. Świątek said that Collins hits "the fastest ball I have ever played against in a match." In the final, Collins lost in straight sets despite being 5–1 up in the second set. As a result of her performance, Collins made her top-10 debut and became the American No. 1 female player. At the
French Open, she lost to fellow American
Shelby Rogers, in straight sets, in the second round. In
Wimbledon, Collins lost in the first round to
Marie Bouzková, in three sets. At the same tournament, partnering
Desirae Krawczyk, she reached the quarterfinals for a second time and then the semifinals for the first time at a major in doubles in her career. Seeded 19th at the
US Open, she reached the round of 16 for the first time upon defeating two-time US Open champion
Naomi Osaka,
Cristina Bucșa, and Alizé Cornet. In the fourth round, she lost to world No. 6 and eventual semifinalist Aryna Sabalenka in three sets.
2023: First WTA Tour doubles title Collins started her 2023 season in
Adelaide. Seeded fifth at
the first tournament, she lost in the first round to
Elena Rybakina in three sets. Seeded 10th at
the second tournament, she reached the quarterfinals where she was defeated by sixth seed and world No. 9,
Veronika Kudermetova in three sets, despite having five match points during the match. Seeded 13th as the prior year's finalist at the
Australian Open, she beat
Anna Kalinskaya in the first round. In the second round, she outlasted
Karolína Muchová in a two-hour-and-56-minute three-set marathon match. In the third round, she lost to 22nd seed and eventual finalist, Elena Rybakina, in three sets. Due to not defending her finalist points earned in 2022, Collins's ranking fell from 11 to 40 after the Australian Open. In the beginning of February, at the
Abu Dhabi Open, Collins was defeated in the first round by fifth seed and world No. 12, Jeļena Ostapenko, in three sets. At the
Qatar Ladies Open, she suffered a second-round thrashing at the hands of defending champion, world No. 1, and eventual champion, Iga Świątek, winning only one game. In
Dubai, she fell in the first round to 17-year-old
Linda Fruhvirtová. Seeded fourth at the inaugural edition of the
ATX Open in Austin, Texas she reached the semifinals where she lost to eighth seed,
Marta Kostyuk, who would end up winning her first WTA Tour singles title. At the
Indian Wells Open, she was defeated in the first round by lucky loser
Dalma Gálfi. Seeded 30th at the
Miami Open, she lost in the third round to third seed and compatriot, Jessica Pegula. Collins started her clay-court season in April at the
Charleston Open. Seeded 13th, she lost in the first round to Shelby Rogers. In
doubles, she won her first WTA Tour doubles title alongside compatriot Desirae Krawczyk, beating top seeds
Giuliana Olmos and
Ena Shibahara in the final. She withdrew from both the
Madrid Open and the
Italian Open. Returning to action at the
French Open, she was defeated in the first round by third seed Jessica Pegula.
2024: Two titles, top 10, retirement U-turn After her loss to world No. 1 Iga Świątek at the
Australian Open, Collins announced that 2024 would be her last year of playing professional tennis. At the
Abu Dhabi Open where she qualified for the main draw, she defeated former No. 1, wildcard Naomi Osaka, in straight sets. The following week, she also qualified for the WTA 1000
Qatar Ladies Open and reached the quarterfinals, defeating 13th seed Veronika Kudermetova, and Czechs Marie Bouzková and
Kateřina Siniaková. In the quarterfinals, Collins lost to Anastasia Pavlyuchenkova in straight sets. In
Indian Wells, Collins defeated Russian qualifier
Erika Andreeva and then lost to Iga Świątek in the second round. In
Miami, she reached the quarterfinals for the third time at this tournament, with wins over
Bernarda Pera, Russians 30th seed
Anastasia Potapova and
Elina Avanesyan, and 19th seed
Sorana Cirstea. She reached her second career WTA 1000 semifinal (after 2018 Miami) with a straight-set win against Caroline Garcia, increasing the head-to-head to 4–0. In the semifinals, she then defeated 14th seed
Ekaterina Alexandrova, also in straight sets, to advance to her first WTA 1000 final. Ranked No. 53, she became the second lowest-ranked finalist in Miami behind only Naomi Osaka, and the fourth-oldest first-time WTA 1000 finalist since the category was introduced in 2009. She secured her inaugural WTA 1000 title with a decisive victory in straight sets over Elena Rybakina, the fourth seed and previous year's runner-up. This historic win marked her as the lowest-ranked champion, only the second unseeded woman to achieve the feat, and the third woman to claim her maiden singles title in Miami after turning 30 years old, following Chris Evert (1986) and Petra Kvitová (2023), since the tournament's inception in 1985. Additionally, she joined the champions list as the sixth American to triumph in Miami. As a result, she returned to the top 25 in the rankings, at No. 22. Unseeded again at the
Charleston Open, she defeated
Paula Badosa, and second seed and defending champion
Ons Jabeur. Next, she defeated
Sloane Stephens (her second match in one day), 11th seed
Elise Mertens, and world No. 7 and third seed,
Maria Sakkari, all in straight sets, to reach the final, extending her record to 12 consecutive match wins. She lifted her second straight singles trophy in two weeks and fourth overall, defeating fourth seed
Daria Kasatkina in straight sets. This marked her 22nd win since the beginning of the season, and tied her for the most wins with Świątek and Rybakina. She became the first player to win back-to-back titles in Miami and Charleston since
Serena Williams in 2013. With the title, she returned to the top 15 on April 8, 2024. In
Madrid, Collins continued her winning streak to 15 matches, securing victories over qualifiers
Olga Danilović and
Jaqueline Cristian. However, her streak ended in the fourth round when she was defeated by world No. 2,
Aryna Sabalenka, in three sets. Seeded 13th at the
Italian Open, she reached her maiden WTA 1000 clay-court semifinal without dropping a set, with wins over
Anna Blinkova by retirement, 22nd seed
Caroline Garcia,
Irina-Camelia Begu and 24th seed
Victoria Azarenka. Her run was once again halted by Aryna Sabalenka, this time in straight sets. At the WTA 500 in
Strasbourg, she advanced to her third final of the season, defeating Kateřina Siniaková,
Clara Burel, and
Anhelina Kalinina. In an All-American final, she lost to fourth seed
Madison Keys in straight sets. As a result, she returned to the top 10 for the first time since August 2022. At the
French Open, she was upset in the second round by qualifier Olga Danilović. Seeded 11th at
Wimbledon she defeated
Clara Tauson,
Dalma Gálfi and 20th seed
Beatriz Haddad Maia to reach the round-of-16 at the grass-court Major for the first time where she lost to eventual champion
Barbora Krejčíková. Collins reached the quarterfinals at the
Paris Olympics but retired due to injury while trailing in the third set of her match with world number one
Iga Świątek. At the
US Open, she lost in the first round to
Caroline Dolehide. Collins also lost her opening match at the
Guadalajara Open to
Olivia Gadecki. In October, Collins announced she had changed her mind about retiring and would play on in 2025.
2025: Strasbourg semifinal Collins defeated qualifiers
Daria Snigur and
Destanee Aiava to reach the third round at the
Australian Open, where she lost to 10th seed and eventual champion
Madison Keys. In March, seeking to defend her title at the
Miami Open, she overcame
Sorana Cîrstea and qualifier
Rebeka Masarova, before losing to world No.1 and eventual champion Aryna Sabalenka. At the
Charleston Open, again as defending champion and seeded seventh, Collins reached the quarterfinals with wins over
Robin Montgomery and 11th seed
Jeļena Ostapenko, before losing in the last eight to top seed
Jessica Pegula in three sets. In May at the
Strasbourg Open, she defeated
Sofia Kenin and wildcard entrant
Emma Raducanu, before being given a walkover into the semifinals when her scheduled opponent,
Anna Kalinskaya, withdrew due to injury. Collins lost in the last four to eighth seed
Liudmila Samsonova. Now ranked outside the world's top-32 and therefore unseeded, Collins reached the third round at
Wimbledon, at which point she lost to eighth seed and eventual champion Iga Świątek in straight sets. At the
US Open, she lost in the first round to
Jaqueline Cristian in straight sets. ==World TeamTennis==