# 2021 J&T Banka Ostrava Open – Singles

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.

## Seeds

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)

## Draw
### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* Alt = Alternate
* SE = Special exempt
* PR = Protected ranking
* ITF = ITF entry
* JE = Junior exempt
* w/o = Walkover
* r = Retired
* d = Defaulted
* SR = Special ranking

### Finals

| Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| 1 | Iga Świątek | 4 | 5 | | | | |
| 4 | Maria Sakkari | 6 | 7 | | | | |
| 4 | Maria Sakkari | 6 | 7 | 4 | Maria Sakkari | 2 | 5 |
| | | | | | Anett Kontaveit | 6 | 7 |
| | Anett Kontaveit | 6 | 6 | | Anett Kontaveit | 6 | 7 |
| 2 | Petra Kvitová | 0 | 4 | | | | |

### Top half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| | | | | | 1 | I Świątek | 6 | 6 | | | | | | | | | |
| | S Zhang | 7 | 6$^7$ | 4 | | Y Putintseva | 4 | 4 | | | | | | | | | |
| | Y Putintseva | 5 | 7$^9$ | 6 | | | | | | 1 | I Świątek | 7$^7$ | 6 | | | | |
| Q | O Dodin | 2 | 6$^3$ | | | | | | | 7 | E Rybakina | 6$^5$ | 2 | | | | |
| Q | M Linette | 6 | 7$^7$ | | 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 | 7$^9$ | | | | | | WC | T Martincová | 5 | 3 | | | | |
| WC | K Siniaková | 7 | 4 | 6$^7$ | WC | T Martincová | 7$^7$ | 7$^8$ | | | | | | | | | |
| Q | A Konjuh | 6$^3$ | 1 | | 5 | A Pavlyuchenkova | 6$^5$ | 6$^6$ | | | | | | | | | |
| 5 | A Pavlyuchenkova | 7$^7$ | 6 | | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | 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 | 6$^6$ | | | | | | | 2 | P Kvitová | 6 | 6 | | | | |
| Q | A Potapova | 6 | 7$^8$ | | Q | A Potapova | 1 | 7$^7$ | 3 | | | | | | | | |
| | | | | | 2 | P Kvitová | 6 | 6$^4$ | 6 | | | | | | | | |

## Qualifying
### Seeds

* 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)

### Qualifiers

* Anastasia Potapova
* Magda Linette
* Océane Dodin
* Anastasia Zakharova
* Ana Konjuh
* Fiona Ferro

### Lucky losers

* Anna Blinkova
* Varvara Gracheva

### Qualifying draw
#### First qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 1 | Ekaterina Alexandrova | 6 | 6 | | | | | |
| WC | Julia Lohoff | 0 | 4 | | | | | |
| WC | Julia Lohoff | 0 | 4 | | 1 | Ekaterina Alexandrova | 5 | 1$^r$ |
| | | | | | 7 | Anastasia Potapova | 7 | 3 |
| | Stefanie Vögele | 6 | 2 | 2 | 7 | Anastasia Potapova | 7 | 3 |
| 7 | Anastasia Potapova | 3 | 6 | 6 | | | | |

#### Second qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 2 | Magda Linette | 6 | 6 | | | | |
| | Rutuja Bhosale | 0 | 1 | | | | |
| | Rutuja Bhosale | 0 | 1 | 2 | Magda Linette | 6 | 6 |
| | | | | | Katarzyna Kawa | 1 | 2 |
| | Katarzyna Kawa | 6 | 6 | | Katarzyna Kawa | 1 | 2 |
| 11 | Misaki Doi | 2 | 4 | | | | |

#### Third qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 3 | Varvara Gracheva | 7$^7$ | 6 | | | | | |
| | Anna Danilina | 6$^3$ | 4 | | | | | |
| | Anna Danilina | 6$^3$ | 4 | 3 | Varvara Gracheva | 7$^7$ | 1 | 4 |
| | | | | 9 | Océane Dodin | 6$^4$ | 6 | 6 |
| | Anna-Lena Friedsam | 6$^3$ | 6$^5$ | 9 | Océane Dodin | 6$^4$ | 6 | 6 |
| 9 | Océane Dodin | 7$^7$ | 7$^7$ | | | | | |

#### Fourth qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 4 | Rebecca Peterson | 6$^7$ | 6 | 2 | | | | |
| | Anastasia Zakharova | 7$^9$ | 2 | 6 | | | | |
| | Anastasia Zakharova | 7$^9$ | 2 | 6 | | Anastasia Zakharova | 6 | 6 |
| | | | | | 12 | Astra Sharma | 4 | 3 |
| WC | Antonia Ružić | 4 | 1 | | 12 | Astra Sharma | 4 | 3 |
| 12 | Astra Sharma | 6 | 6 | | | | | |

#### Fifth qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 5 | Ana Konjuh | 6 | 6 | | | | |
| WC | Radka Zelníčková | 4 | 1 | | | | |
| WC | Radka Zelníčková | 4 | 1 | 5 | Ana Konjuh | 7$^7$ | 6 |
| | | | | 8 | Bernarda Pera | 6$^4$ | 3 |
| | Katarzyna Piter | 0 | 1 | 8 | Bernarda Pera | 6$^4$ | 3 |
| 8 | Bernarda Pera | 6 | 6 | | | | |

#### Sixth qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 6 | Fiona Ferro | 3 | 7$^7$ | 6 | | | | |
| WC | Oksana Kalashnikova | 6 | 6$^3$ | 1 | | | | |
| WC | Oksana Kalashnikova | 6 | 6$^3$ | 1 | 6 | Fiona Ferro | 6 | 6 |
| | | | | | 10 | Anna Blinkova | 1 | 1 |
| WC | Rosalie van der Hoek | 0 | 2 | | 10 | Anna Blinkova | 1 | 1 |
| 10 | Anna Blinkova | 6 | 6 | | | | | |