| Doubles | |
|---|---|
| 2021 Phillip Island Trophy | |
| Champions |  Ankita Raina  Kamilla Rakhimova |
| Runners-up | Anna Blinkova Anastasia Potapova |
| Final score | 2–6, 6–4, [10–7] |
The Phillip Island Trophy was a new addition to the WTA Tour in 2021. [1]
Ankita Raina and Kamilla Rakhimova won the title, defeating Anna Blinkova and Anastasia Potapova in the final, 2–6, 6–4, [10–7].
Chan Hao-ching / Latisha Chan (Quarterfinals)
Monica Niculescu / 
Yang Zhaoxuan (Second round)
Kaitlyn Christian / Sabrina Santamaria (Second round) Andreea Mitu / Raluca Olaru (Second round)
Oksana Kalashnikova / 
Cornelia Lister (Second round)
Kirsten Flipkens / Greet Minnen (Second round)
Makoto Ninomiya / Wang Yafan (Semifinals) Misaki Doi / Nao Hibino (First round, withdrew)| Semifinals | Final | ||||||||||||
| 7 | Makoto Ninomiya Wang Yafan | 4 | 3 | ||||||||||
| Anna Blinkova Anastasia Potapova | 6 | 6 | |||||||||||
| Anna Blinkova Anastasia Potapova | 6 | 4 | [7] | ||||||||||
| Ankita Raina Kamilla Rakhimova | 2 | 6 | [10] | ||||||||||
| Ankita Raina Kamilla Rakhimova | 4 | 6 | [11] | ||||||||||
 Francesca Jones  Nadia Podoroska | 6 | 4 | [9] | ||||||||||
| First Round | Second Round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | H-c Chan L Chan | 77 | 6 | ||||||||||||||||||||||||
| C McHale V Savinykh | 6 | 6 | C McHale V Savinykh | 65 | 4 | ||||||||||||||||||||||
Y Sizikova  R Voráčová | 3 | 2 | 1 | H-c Chan L Chan | 3 | 66 | |||||||||||||||||||||
M Bouzková  S Sorribes Tormo | 7 | M Ninomiya Y Wang | 6 | 78 | |||||||||||||||||||||||
 K Birrell O Gadecki | w/o | K Birrell O Gadecki | |||||||||||||||||||||||||
| 7 | M Ninomiya Y Wang | w/o | |||||||||||||||||||||||||
| 7 | M Ninomiya Y Wang | 4 | 3 | ||||||||||||||||||||||||
| A Blinkova A Potapova | 6 | 6 | |||||||||||||||||||||||||
| 4 | A Mitu R Olaru | 68 | 63 | ||||||||||||||||||||||||
| A Blinkova A Potapova | 6 | 6 | A Blinkova A Potapova | 710 | 77 | ||||||||||||||||||||||
| L Cabrera M Inglis | 1 | 1 | A Blinkova A Potapova | 6 | 7 | ||||||||||||||||||||||
| M Brengle L Davis | 4 | 0 |  K Bondarenko N Kichenok | 2 | 5 | ||||||||||||||||||||||
| K Bondarenko N Kichenok | 6 | 6 | K Bondarenko N Kichenok | 7 | 7 | ||||||||||||||||||||||
| 6 | K Flipkens G Minnen | 5 | 5 | ||||||||||||||||||||||||
| First Round | Second Round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 5 | O Kalashnikova C Lister | 3 | 4 | ||||||||||||||||||||||||
| M Buzărnescu PM Țig | 1 | 63 | A Raina K Rakhimova | 6 | 6 | ||||||||||||||||||||||
| A Raina K Rakhimova | 6 | 77 | A Raina K Rakhimova | 6 | 77 | ||||||||||||||||||||||
 V Lapko A Sasnovich | 6 | 6 | V Lapko A Sasnovich | 4 | 62 | ||||||||||||||||||||||
| WC | D Aiava C Kempenaers-Pocz | 0 | 4 | V Lapko A Sasnovich | 6 | 6 | |||||||||||||||||||||
| 3 | K Christian S Santamaria | 4 | 3 | ||||||||||||||||||||||||
| A Raina K Rakhimova | 4 | 6 | [11] | ||||||||||||||||||||||||
| 8 | M Doi N Hibino | F Jones N Podoroska | 6 | 4 | [9] | ||||||||||||||||||||||
| G Da Silva-Fick P Yadlapalli | w/o | G Da Silva-Fick P Yadlapalli | 3 | 6 | [6] | ||||||||||||||||||||||
| A Osborne A Sharma | 2 | 4 |  P Martić  A Sevastova | 6 | 2 | [10] | |||||||||||||||||||||
| P Martić A Sevastova | 6 | 6 | P Martić A Sevastova | 3 | 2 | ||||||||||||||||||||||
| F Jones N Podoroska | 6 | 6 | F Jones N Podoroska | 6 | 6 | ||||||||||||||||||||||
 E Cocciaretto A Muhammad | 4 | 3 | F Jones N Podoroska | 6 | 4 | [10] | |||||||||||||||||||||
| 2 | M Niculescu Z Yang | 4 | 6 | [8] | |||||||||||||||||||||||
Samantha Stosur successfully defended her title, defeating Zarina Diyas in the final, 7–6(9–7), 6–3.
Sara Errani and Roberta Vinci were the two-time defending champions, but lost to Julia Görges and Anna-Lena Grönefeld in the third round.
Andrea Hlaváčková and Peng Shuai were the defending champions, but Peng could not participate due to injury. Hlaváčková played alongside Lucie Hradecká, but lost in the quarterfinals to Casey Dellacqua and Yaroslava Shvedova.
Martina Hingis and Sania Mirza won the title, defeating Chan Hao-ching and Chan Yung-jan in the final, 6–7(9–11), 6–1, [10–8].
Raquel Atawo and Abigail Spears were the defending champions, but lost in the second round to Gabriela Dabrowski and María José Martínez Sánchez.
Chan Hao-ching and Chan Yung-jan won the title, defeating Sara Errani and Carla Suárez Navarro in the final, 6–3, 6–3.
Martina Hingis and Sania Mirza were the defending champions, but lost in the second round to Margarita Gasparyan and Monica Niculescu.
Bethanie Mattek-Sands and Lucie Šafářová won the title, defeating Tímea Babos and Yaroslava Shvedova in the final, 6–3, 6–4.
Chan Hao-ching and Chan Yung-jan were the defending champions, but lost in the semifinals to Sania Mirza and Barbora Strýcová.
Martina Hingis and Sania Mirza were the defending champions, but chose not to participate together. Hingis played alongside Coco Vandeweghe, but lost in the second round to Aleksandra Krunić and Kateřina Siniaková.
Elena Vesnina and Bruno Soares were the defending champions, but Vesnina chose not to participate this year. Soares played alongside Kateřina Siniaková, but the team withdrew before their second round match against Elina Svitolina and Chris Guccione.
Bethanie Mattek-Sands and Coco Vandeweghe were the defending champions, but chose not to participate together. Mattek-Sands played alongside Lucie Šafářová, but lost in the semifinals to Chan Yung-jan and Martina Hingis. Vandeweghe teamed up with Shelby Rogers, but lost in the first round to Andreja Klepač and María José Martínez Sánchez.
Gabriela Dabrowski and Rohan Bopanna won the Mixed Doubles tennis title at the 2017 French Open, defeating Anna-Lena Grönefeld and Robert Farah in the final, 2–6, 6–2, [12–10].
Martina Hingis and Sania Mirza were the defending champions, but chose not to participate together. Mirza played alongside Yaroslava Shvedova, but lost in the semifinals to Chan Yung-jan and Hingis.
Martina Hingis and Jamie Murray were the defending champions, but Hingis retired from professional tennis at the end of 2017. Murray successfully defended his title alongside Bethanie Mattek-Sands, defeating Alicja Rosolska and Nikola Mektić, 2–6, 6–3, [11–9] to win the Mixed Doubles tennis title at the 2018 US Open
Latisha Chan and Martina Hingis were the defending champions, but Hingis retired from professional tennis at the end of 2017. Chan played alongside her sister Chan Hao-ching, but lost in the second round to Hsieh Su-wei and Barbora Strýcová.
Latisha Chan and Martina Hingis were the defending champions, but Hingis retired from professional tennis at the end of 2017. Chan played alongside Bethanie Mattek-Sands, but lost in the quarterfinals to Andrea Sestini Hlaváčková and Barbora Strýcová.
Gabriela Dabrowski and Rohan Bopanna were the defending champions, but chose not to compete together. Bopanna teamed up with Tímea Babos, but lost in the first round to Zhang Shuai and John Peers. Dabrowski played alongside Mate Pavić, but lost to Latisha Chan and Ivan Dodig in the final, 6–1, 6–7(5–7), [10–8].
Ashleigh Barty and Demi Schuurs were the defending champions, but chose not to participate together. Barty played alongside Victoria Azarenka and successfully defended the title, defeating Schuurs and Anna-Lena Grönefeld in the final, 4–6, 6–0, [10–3].
Latisha Chan and Ivan Dodig were the defending champions and successfully defended their title, defeating Gabriela Dabrowski and Mate Pavić in a rematch of the 2018 final, 6–1, 7–6(7–5). becoming the first team in the Open era to win back-to-back French Open mixed doubles title.
The Gippsland Trophy is a new addition to the WTA Tour in 2021.
Two-time defending champion Barbora Krejčíková and her partner, Rajeev Ram, defeated Samantha Stosur and Matthew Ebden in the final, 6–1, 6–4, to win the Mixed Doubles tennis title at the 2021 Australian Open. This was the second major mixed doubles title Krejčíková and Ram won together as a team after they won their first at the 2019 Australian Open. The pair saved a match point in their second round match against Ena Shibahara and Ben McLachlan en route to the title.
Neal Skupski and Desirae Krawczyk defeated Joe Salisbury and Harriet Dart in the final, 6–2, 7–6(7–1), to win the Mixed Doubles title at the 2021 Wimbledon Championships. It was Krawczyk's second consecutive major title in mixed doubles, following her success at the French Open.
| Grand Slam events | |
|---|---|
| WTA 1000 tournaments | |
| WTA 500 tournaments | |
| WTA 250 tournaments |
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| Team events | |
Bold denotes the mandatory tournaments (WTA 1000)  – Tournaments are affected by the COVID-19 pandemic * – Tournaments are introduced due to the impact of the COVID-19 pandemic | |