# 2021 Kremlin Cup – Women's singles

Belinda Bencic was the defending champion, having won the previous edition in 2019, but she withdrew before the tournament began.
Anett Kontaveit won the title, defeating Ekaterina Alexandrova in the final, 4–6, 6–4, 7–5.

## Seeds

The top four seeds received a bye into the second round.
* Aryna Sabalenka (quarterfinals)
* Garbiñe Muguruza (quarterfinals)
* Maria Sakkari (semifinals, retired)
* Anastasia Pavlyuchenkova (quarterfinals)
* Ons Jabeur (first round, retired)
* Angelique Kerber (withdrew)
* Elena Rybakina (first round)
* Simona Halep (quarterfinals)
* Anett Kontaveit (champion)

## 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 | Final |
| | Ekaterina Alexandrova | 4 | | | | | | |
| 3 | Maria Sakkari | 1$^r$ | | | | | | |
| 3 | Maria Sakkari | 1$^r$ | | | Ekaterina Alexandrova | 6 | 4 | 5 |
| | | | | 9/WC | Anett Kontaveit | 4 | 6 | 7 |
| | Markéta Vondroušová | 3 | 4 | 9/WC | Anett Kontaveit | 4 | 6 | 7 |
| 9/WC | Anett Kontaveit | 6 | 6 | | | | | |

### 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 |
| | | | | | 1/WC | A Sabalenka | 7$^7$ | 4 | 6 | | | | | | | |
| | L Samsonova | 2 | 4 | | | A Tomljanović | 6$^2$ | 6 | 1 | | | | | | | |
| | A Tomljanović | 6 | 6 | | | | | | | 1/WC | A Sabalenka | 3 | 4 | | | |
| | D Kasatkina | 2 | 3 | | | | | | | | E Alexandrova | 6 | 6 | | | |
| | A Kalinina | 6 | 6 | | | A Kalinina | 4 | 1 | | | | | | | | |
| | E Alexandrova | 6 | 1 | | | E Alexandrova | 6 | 6 | | | | | | | | |
| 5 | O Jabeur | 1 | 0$^r$ | | | | | | | | | | | | E Alexandrova | 4 |
| | | | | | | | | | | | | | | 3 | M Sakkari | 1$^r$ |
| | | | | | 3 | M Sakkari | 6 | 1 | | | | | | | | |
| | D Yastremska | 6$^5$ | 4 | | Q | A Kalinskaya | 2 | 0$^r$ | | | | | | | | |
| Q | A Kalinskaya | 7$^7$ | 6 | | | | | | | 3 | M Sakkari | 6 | 6 | | | |
| | V Kudermetova | 4 | 7$^7$ | 6 | | | | | | 8/WC | S Halep | 4 | 4 | | | |
| Q | O Selekhmeteva | 6 | 6$^3$ | 4 | | V Kudermetova | 1 | 6$^4$ | | | | | | | | |
| WC | A Potapova | 1 | 4 | | 8/WC | S Halep | 6 | 7$^7$ | | | | | | | | |
| 8/WC | S Halep | 6 | 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 |
| 7 | E Rybakina | 4 | 4 | | | | | | | | | | | | | | |
| | M Vondroušová | 6 | 6 | | | M Vondroušová | 6 | 6 | | | | | | | | | |
| Q | Q Zheng | 4 | 3 | | Q | L Tsurenko | 3 | 3 | | | | | | | | | |
| Q | L Tsurenko | 6 | 6 | | | | | | | | M Vondroušová | 6 | 6 | | | | |
| Q | A Krunić | 6$^3$ | 3 | | | | | | | 4 | A Pavlyuchenkova | 4 | 2 | | | | |
| Q | B Pera | 7$^7$ | 6 | | Q | B Pera | 2 | 5 | | | | | | | | | |
| | | | | | 4 | A Pavlyuchenkova | 6 | 7 | | | | | | | | | |
| | | | | | | | | | | | | | | | M Vondroušová | 3 | 4 |
| 9/WC | A Kontaveit | 6 | 6 | | | | | | | | | | | 9/WC | A Kontaveit | 6 | 6 |
| | K Siniaková | 3 | 3 | | 9/WC | A Kontaveit | 6 | 6 | | | | | | | | | |
| | J Ostapenko | 6 | 0 | 0$^r$ | | A Petkovic | 1 | 4 | | | | | | | | | |
| | A Petkovic | 2 | 6 | 2 | | | | | | 9/WC | A Kontaveit | 6 | 6 | | | | |
| LL | I Bara | 0 | 5 | | | | | | | 2 | G Muguruza | 1 | 1 | | | | |
| | T Martincová | 6 | 7 | | | T Martincová | 4 | 6 | 3 | | | | | | | | |
| | | | | | 2 | G Muguruza | 6 | 4 | 6 | | | | | | | | |

## Qualifying
### Seeds

* Bernarda Pera (qualified)
* Kamilla Rakhimova (first round)
* Irina Bara (qualifying competition, lucky loser)
* Viktoriya Tomova (first round)
* Anna-Lena Friedsam (qualifying competition)
* Vitalia Diatchenko (qualifying competition)
* Anastasia Gasanova (first round)
* Aleksandra Krunić (qualified)
* Lesia Tsurenko (qualified)
* Lucia Bronzetti (first round)
* Anna Kalinskaya (qualified)
* Arina Rodionova (first round)

### Qualifiers

* Bernarda Pera
* Oksana Selekhmeteva
* Zheng Qinwen
* Aleksandra Krunić
* Lesia Tsurenko
* Anna Kalinskaya

### Lucky loser

* Irina Bara

### Qualifying draw
#### First qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 1 | Bernarda Pera | 6 | 6 | | | | |
| WC | Erika Andreeva | 2 | 3 | | | | |
| WC | Erika Andreeva | 2 | 3 | 1 | Bernarda Pera | 6 | 6 |
| | | | | PR | Vera Lapko | 1 | 4 |
| PR | Vera Lapko | 6 | 6 | PR | Vera Lapko | 1 | 4 |
| 10 | Lucia Bronzetti | 3 | 1 | | | | |

#### Second qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 2 | Kamilla Rakhimova | 4 | 2 | | | | | |
| WC | Diana Shnaider | 6 | 6 | | | | | |
| WC | Diana Shnaider | 6 | 6 | | WC | Diana Shnaider | 4 | 6$^2$ |
| | | | | | WC | Oksana Selekhmeteva | 6 | 7$^7$ |
| WC | Oksana Selekhmeteva | 6 | 3 | 6 | WC | Oksana Selekhmeteva | 6 | 7$^7$ |
| 12 | Arina Rodionova | 3 | 6 | 4 | | | | |

#### Third qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 3 | Irina Bara | 6 | 6 | | | | |
| | Natalia Vikhlyantseva | 2 | 4 | | | | |
| | Natalia Vikhlyantseva | 2 | 4 | 3 | Irina Bara | 0 | 1 |
| | | | | | Zheng Qinwen | 6 | 6 |
| | Zheng Qinwen | 6 | 6 | | Zheng Qinwen | 6 | 6 |
| 7 | Anastasia Gasanova | 4 | 2 | | | | |

#### Fourth qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 4 | Viktoriya Tomova | 6 | 4 | 6$^5$ | | | | |
| WC | Anastasia Tikhonova | 4 | 6 | 7$^7$ | | | | |
| WC | Anastasia Tikhonova | 4 | 6 | 7$^7$ | WC | Anastasia Tikhonova | 1 | 1 |
| | | | | | 8 | Aleksandra Krunić | 6 | 6 |
| | Katie Boulter | 6$^{10}$ | 2 | | 8 | Aleksandra Krunić | 6 | 6 |
| 8 | Aleksandra Krunić | 7$^{12}$ | 6 | | | | | |

#### Fifth qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 5 | Anna-Lena Friedsam | 6 | 6 | | | | |
| | Valentini Grammatikopoulou | 3 | 0 | | | | |
| | Valentini Grammatikopoulou | 3 | 0 | 5 | Anna-Lena Friedsam | 1 | 1 |
| | | | | 9 | Lesia Tsurenko | 6 | 6 |
| | Rebecca Šramková | 2 | 5 | 9 | Lesia Tsurenko | 6 | 6 |
| 9 | Lesia Tsurenko | 6 | 7 | | | | |

#### Sixth qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 6/PR | Vitalia Diatchenko | 6 | 7 | | | | | |
| | Ekaterine Gorgodze | 3 | 5 | | | | | |
| | Ekaterine Gorgodze | 3 | 5 | | 6/PR | Vitalia Diatchenko | 4 | 2 |
| | | | | | 11 | Anna Kalinskaya | 6 | 6 |
| | Viktória Kužmová | 3 | 7$^7$ | 1 | 11 | Anna Kalinskaya | 6 | 6 |
| 11 | Anna Kalinskaya | 6 | 6$^2$ | 6 | | | | |