| Singles | |
|---|---|
| 2021 J&T Banka Ostrava Open | |
| Champion |  Anett Kontaveit |
| Runner-up |  Maria Sakkari |
| Final score | 6–2, 7–5 |
| Draw | 28 |
| Seeds | 8 |
Aryna Sabalenka was the defending champion, but she chose not to compete this year.
Anett Kontaveit won her maiden WTA 500 title without dropping a set, defeating Maria Sakkari in the final, 6–2, 7–5.
The top four seeds received a bye into the second round.
Iga Świątek (semifinals)
Petra Kvitová (semifinals)
Belinda Bencic (quarterfinals) Maria Sakkari (final)
Anastasia Pavlyuchenkova (second round)
Angelique Kerber (first round)
Elena Rybakina (quarterfinals) Karolína Muchová (withdrew)
Paula Badosa (second round)| Semifinals | Final | ||||||||||||
| 1 | Iga Świątek | 4 | 5 | ||||||||||
| 4 | Maria Sakkari | 6 | 7 | ||||||||||
| 4 | Maria Sakkari | 2 | 5 | ||||||||||
| Anett Kontaveit | 6 | 7 | |||||||||||
| Anett Kontaveit | 6 | 6 | |||||||||||
| 2 | Petra Kvitová | 0 | 4 | ||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | I Świątek | 6 | 6 | ||||||||||||||||||||||||
 S Zhang | 7 | 67 | 4 | Y Putintseva | 4 | 4 | |||||||||||||||||||||
| Y Putintseva | 5 | 79 | 6 | 1 | I Świątek | 77 | 6 | ||||||||||||||||||||
| Q |  O Dodin | 2 | 63 | 7 | E Rybakina | 65 | 2 | ||||||||||||||||||||
| Q | M Linette | 6 | 77 | Q | M Linette | 3 | 6 | 1 | |||||||||||||||||||
| V Kudermetova | 1 | 3 | 7 | E Rybakina | 6 | 2 | 6 | ||||||||||||||||||||
| 7 | E Rybakina | 6 | 6 | 1 | I Świątek | 4 | 5 | ||||||||||||||||||||
| 4 | M Sakkari | 6 | 7 | ||||||||||||||||||||||||
| 4 | M Sakkari | 6 | 6 | ||||||||||||||||||||||||
| LL | A Blinkova | 4 | 0 | WC |  J Ostapenko | 4 | 2 | ||||||||||||||||||||
| WC | J Ostapenko | 6 | 6 | 4 | M Sakkari | 7 | 6 | ||||||||||||||||||||
| WC | T Martincová | 5 | 6 | 79 | WC | T Martincová | 5 | 3 | |||||||||||||||||||
| WC | K Siniaková | 7 | 4 | 67 | WC | T Martincová | 77 | 78 | |||||||||||||||||||
| Q |  A Konjuh | 63 | 1 | 5 | A Pavlyuchenkova | 65 | 66 | ||||||||||||||||||||
| 5 | A Pavlyuchenkova | 77 | 6 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 9 | P Badosa | 6 | 6 | ||||||||||||||||||||||||
| LL | V Gracheva | 2 | 2 | 9 | P Badosa | 3 | 4 | ||||||||||||||||||||
 S Cîrstea | 4 | 4 | A Kontaveit | 6 | 6 | ||||||||||||||||||||||
| A Kontaveit | 6 | 6 | A Kontaveit | 6 | 6 | ||||||||||||||||||||||
| Q | A Zakharova | 3 | 3 | 3 | B Bencic | 4 | 3 | ||||||||||||||||||||
| S Sorribes Tormo | 6 | 6 | S Sorribes Tormo | 2 | 3 | ||||||||||||||||||||||
| 3 | B Bencic | 6 | 6 | ||||||||||||||||||||||||
| A Kontaveit | 6 | 6 | |||||||||||||||||||||||||
| 6 | A Kerber | 2 | 3 | 2 | P Kvitová | 0 | 4 | ||||||||||||||||||||
| J Teichmann | 6 | 6 | J Teichmann | 6 | 1 | 6 | |||||||||||||||||||||
 A Riske | 6 | 1 | 6 | A Riske | 3 | 6 | 4 | ||||||||||||||||||||
| Q | F Ferro | 4 | 6 | 4 | J Teichmann | 4 | 4 | ||||||||||||||||||||
| WC | C Garcia | 2 | 66 | 2 | P Kvitová | 6 | 6 | ||||||||||||||||||||
| Q | A Potapova | 6 | 78 | Q | A Potapova | 1 | 77 | 3 | |||||||||||||||||||
| 2 | P Kvitová | 6 | 64 | 6 | |||||||||||||||||||||||
Ekaterina Alexandrova (qualifying competition, retired) Magda Linette (qualified) Varvara Gracheva (qualifying competition, lucky loser)
Rebecca Peterson (first round) Ana Konjuh (qualified) Fiona Ferro (qualified) Anastasia Potapova (qualified) Bernarda Pera (qualifying competition) Océane Dodin (qualified) Anna Blinkova (qualifying competition, lucky loser)
Misaki Doi (first round)
Astra Sharma (qualifying competition)| First round | Qualifying competition | ||||||||||||
| 1 | Ekaterina Alexandrova | 6 | 6 | ||||||||||
| WC | Julia Lohoff | 0 | 4 | ||||||||||
| 1 | Ekaterina Alexandrova | 5 | 1r | ||||||||||
| 7 | Anastasia Potapova | 7 | 3 | ||||||||||
| Stefanie Vögele | 6 | 2 | 2 | ||||||||||
| 7 | Anastasia Potapova | 3 | 6 | 6 | |||||||||
| First round | Qualifying competition | ||||||||||||
| 2 | Magda Linette | 6 | 6 | ||||||||||
 Rutuja Bhosale | 0 | 1 | |||||||||||
| 2 | Magda Linette | 6 | 6 | ||||||||||
| Katarzyna Kawa | 1 | 2 | |||||||||||
| Katarzyna Kawa | 6 | 6 | |||||||||||
| 11 | Misaki Doi | 2 | 4 | ||||||||||
| First round | Qualifying competition | ||||||||||||
| 3 | Varvara Gracheva | 77 | 6 | ||||||||||
| Anna Danilina | 63 | 4 | |||||||||||
| 3 | Varvara Gracheva | 77 | 1 | 4 | |||||||||
| 9 | Océane Dodin | 64 | 6 | 6 | |||||||||
| Anna-Lena Friedsam | 63 | 65 | |||||||||||
| 9 | Océane Dodin | 77 | 77 | ||||||||||
| First round | Qualifying competition | ||||||||||||
| 4 | Rebecca Peterson | 67 | 6 | 2 | |||||||||
| Anastasia Zakharova | 79 | 2 | 6 | ||||||||||
| Anastasia Zakharova | 6 | 6 | |||||||||||
| 12 | Astra Sharma | 4 | 3 | ||||||||||
| WC | Antonia Ružić | 4 | 1 | ||||||||||
| 12 | Astra Sharma | 6 | 6 | ||||||||||
| First round | Qualifying competition | ||||||||||||
| 5 | Ana Konjuh | 6 | 6 | ||||||||||
| WC |  Radka Zelníčková | 4 | 1 | ||||||||||
| 5 | Ana Konjuh | 77 | 6 | ||||||||||
| 8 | Bernarda Pera | 64 | 3 | ||||||||||
| Katarzyna Piter | 0 | 1 | |||||||||||
| 8 | Bernarda Pera | 6 | 6 | ||||||||||
| First round | Qualifying competition | ||||||||||||
| 6 | Fiona Ferro | 3 | 77 | 6 | |||||||||
| WC |  Oksana Kalashnikova | 6 | 63 | 1 | |||||||||
| 6 | Fiona Ferro | 6 | 6 | ||||||||||
| 10 | Anna Blinkova | 1 | 1 | ||||||||||
| WC |  Rosalie van der Hoek | 0 | 2 | ||||||||||
| 10 | Anna Blinkova | 6 | 6 | ||||||||||
| Grand Slam events | |
|---|---|
| WTA 1000 tournaments | |
| WTA 500 tournaments | |
| WTA 250 tournaments |
|
| 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 | |
Serena Williams was the three-time defending champion, but lost in the fourth round to Svetlana Kuznetsova.
Belinda Bencic was the defending champion, but withdrew with a left wrist injury before the tournament began.
Elitsa Kostova was the defending champion from the event's previous edition as an ITF Women's Circuit tournament, but lost in the first round of qualifying to Barbora Štefková.
Victoria Azarenka was the defending champion, but did not participate this year as she was on maternity leave.
Victoria Azarenka was the defending champion, but did not participate this year as she was on maternity leave.
Elise Mertens was the two-time defending champion but chose to compete in Sydney instead. Sofia Kenin won her first WTA Tour singles title without dropping a set. She defeated Anna Karolína Schmiedlová in the final, 6–3, 6–0.
Alizé Cornet was the defending champion, but lost in the final. Fiona Ferro won her first career WTA Tour singles title, defeating Cornet in the final, 6–1, 2–6, 6–1.
This was the first edition of the tournament.
Caroline Wozniacki was the defending champion, but lost to Naomi Osaka in the semifinals.
Kiki Bertens was the defending champion and successfully defended her title, defeating Elena Rybakina in the final, 6–1, 6–3. This would be Bertens' final WTA Tour singles title before her retirement in July 2021.
Jil Teichmann was the defending champion, but chose not to participate.
Ashleigh Barty was the defending champion from when the tournament was last held in 2019, and she successfully defended her title after Bianca Andreescu retired from the final with the scoreline at 6–3, 4–0. Barty saved a match point in the second round against Kristína Kučová en route to the title. The victory earned Barty her first successful title defense in her singles career and made her the sixth woman to accomplish a title defense at the Miami Open.
Aryna Sabalenka defeated Ashleigh Barty in the final, 6–0, 3–6, 6–4, to win the women's singles tennis title at the 2021 Madrid Open. It was Sabalenka's 10th career WTA Tour singles title and her first title on clay.
Elina Svitolina was the defending champion but chose not to participate.
Bianca Andreescu was the defending champion from when the event was last held in 2019, but lost in the third round to Ons Jabeur.
The 2021 J&T Banka Ostrava Open was a WTA tournament organised for female professional tennis players on indoor hard courts. It was the 2nd edition of the event on the 2021 WTA Tour, primarily organised due to the cancellation of the Asian tournaments during the 2021 season, because of the ongoing COVID-19 pandemic. The event took place at the Ostrava Arena in Ostrava, Czech Republic, from 20 through 26 September 2021.
This was the first edition of the women's event.
Anett Kontaveit defeated Maria Sakkari in the final, 5–7, 7–6(7–4), 7–5 to win the singles title at the 2022 St. Petersburg Ladies' Trophy. Kontaveit's victory in the final was her 20th consecutive match win on indoor hard courts, dating back to the 2021 Ostrava Open; this is the longest such streak since Justine Henin won 22 matches on indoor courts between October 2007 and May 2010.
Ons Jabeur defeated Jessica Pegula in the final, 7–5, 0–6, 6–2 to win the women's singles tennis title at the 2022 Madrid Open. It was her first WTA 1000 title, and she became the first Arab and African woman to win a WTA 1000 title. Pegula reached the final after saving a match point in her first round match against Camila Giorgi.
This was the first edition of the tournament.