| Singles | |
|---|---|
| 2021 J&T Banka Ostrava Open | |
| Champion |  Anett Kontaveit |
| Runner-up |  Maria Sakkari |
| 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. [1]
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 | ||||||||||
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