2021 Kremlin Cup
Tennis tournament in Moscow
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The 2021 Kremlin Cup (also known as the 2021 VTB Kremlin Cup for sponsorship reasons) was a professional tennis tournament played on indoor hard courts. It was the 31st edition of the Kremlin Cup for the men and the 25th edition for the women. The tournament was part of the ATP 250 series of the 2021 ATP Tour,[1] and of the WTA 500 series of the 2021 WTA Tour.[2] It was held at the Irina Viner-Usmanova Gymnastics Palace and the Luzhniki Palace of Sports in Moscow, Russia, from 18 October through 24 October 2021.[3]
WTA $565,530
| 2021 Kremlin Cup | |
|---|---|
| Date | 18–24 October |
| Edition | 31st (men) / 25th (women) |
| Category | ATP 250 (men) WTA 500 (women) |
| Prize money | ATP $697,125 WTA $565,530 |
| Surface | Hard (indoor) |
| Location | Moscow, Russia |
| Venue | Irina Viner-Usmanova Gymnastics Palace Luzhniki Palace of Sports |
| Champions | |
| Men's singles | |
 Aslan Karatsev | |
| Women's singles | |
 Anett Kontaveit | |
| Men's doubles | |
 Harri Heliövaara /  Matwé Middelkoop | |
| Women's doubles | |
 Jeļena Ostapenko /  Kateřina Siniaková | |
Champions
Men's singles
Aslan Karatsev def. 
Marin Čilić, 6–2, 6–4
Women's singles
Anett Kontaveit def. Ekaterina Alexandrova, 4–6, 6–4, 7–5.
This was Kontaveit's 4th WTA title, and 3rd of the year.
Men's doubles
Harri Heliövaara / 
Matwé Middelkoop def. 
Tomislav Brkić / 
Nikola Ćaćić, 7–5, 4–6, [11–9]
Women's doubles
Jeļena Ostapenko / 
Kateřina Siniaková def. 
Nadiia Kichenok / 
Raluca Olaru, 6–2, 4–6, [10–8]
ATP singles main-draw entrants
Seeds
| Country | Player | Rank1 | Seed |
|---|---|---|---|
| RUS |
Andrey Rublev | 5 | 1 |
| RUS |
Aslan Karatsev | 23 | 2 |
| RUS |
Karen Khachanov | 29 | 3 |
 KAZ |
Alexander Bublik | 34 | 4 |
 SRB |
Filip Krajinović | 37 | 5 |
 CRO |
Marin Čilić | 41 | 6 |
 BLR |
|||
| SRB |
Laslo Đere | 47 | 8 |
- Rankings are as of October 4, 2021
Other entrants
The following players received wildcards into the singles main draw:
The following players received entry using a protected ranking:
The following players received entry from the qualifying draw:
The following player received entry as a lucky loser:
Withdrawals
- Before the tournament
Pablo Andújar → replaced by 
Federico Coria
Ilya Ivashka → replaced by 
Ričardas Berankis
Sebastian Korda → replaced by 
Gilles Simon- Daniil Medvedev → replaced by
Mikael Ymer
ATP doubles main-draw entrants
Seeds
| Country | Player | Country | Player | Rank1 | Seed |
|---|---|---|---|---|---|
 RSA |
Raven Klaasen |  JPN |
Ben McLachlan | 57 | 1 |
| KAZ |
Andrey Golubev |  MON |
Hugo Nys | 94 | 2 |
 AUS |
Luke Saville | AUS |
John-Patrick Smith | 96 | 3 |
 BIH |
Tomislav Brkić | SRB |
Nikola Ćaćić | 97 | 4 |
- 1 Rankings are as of October 4, 2021
Other entrants
The following pairs received wildcards into the doubles main draw:
Withdrawals
- Before the tournament
- Pablo Andújar / Laslo Đere → replaced by Laslo Đere / Guido Pella
Marcelo Arévalo / Matwé Middelkoop → replaced by Harri Heliövaara / Matwé Middelkoop- Marin Čilić / Sebastian Korda → replaced by Ilya Ivashka / Pedro Martínez
WTA singles main-draw entrants
Seeds
| Country | Player | Rank1 | Seed |
|---|---|---|---|
| BLR |
Aryna Sabalenka | 2 | 1 |
 ESP |
Garbiñe Muguruza | 6 | 2 |
 GRE |
Maria Sakkari | 9 | 3 |
| RUS |
Anastasia Pavlyuchenkova | 13 | 4 |
 TUN |
Ons Jabeur | 14 | 5 |
 GER |
|||
| KAZ |
Elena Rybakina | 16 | 7 |
 ROU |
Simona Halep | 17 | 8 |
| EST |
Anett Kontaveit | 20 | 9 |
- Rankings are as of October 4, 2021 .[4]
Other entrants
The following players received wildcards into the singles main draw:
The following players received entry from the qualifying draw:
The following player received entry as a lucky loser:
Withdrawals
- Before the tournament
Bianca Andreescu → replaced by Anhelina Kalinina- Paula Badosa → replaced by
Andrea Petkovic 
Belinda Bencic → replaced by Dayana Yastremska- Danielle Collins → replaced by Markéta Vondroušová
- Angelique Kerber → replaced by Irina Bara
- Petra Martić → replaced by Kateřina Siniaková
Elise Mertens → replaced by Liudmila Samsonova
Emma Raducanu → replaced by Tereza Martincová
WTA doubles main-draw entrants
Seeds
| Country | Player | Country | Player | Rank1 | Seed |
|---|---|---|---|---|---|
 CHI |
Alexa Guarachi |  USA |
Desirae Krawczyk | 29 | 1 |
| LAT |
Jeļena Ostapenko | CZE |
Kateřina Siniaková | 35 | 2 |
| CZE |
Marie Bouzková | CZE |
Lucie Hradecká | 70 | 3 |
 UKR |
Nadiia Kichenok | ROU |
Raluca Olaru | 72 | 4 |
- 1 Rankings are as of October 4, 2021
Other entrants
The following pair received a wildcard into the doubles main draw:
The following pair received entry using a protected ranking:
Withdrawals
- Before the tournament
- Sharon Fichman /
Giuliana Olmos → replaced by Anna Kalinskaya / Anastasia Potapova - Veronika Kudermetova / Elena Vesnina → replaced by Natela Dzalamidze / Kamilla Rakhimova
Arina Rodionova / Aliaksandra Sasnovich → replaced by 
Anna Danilina / Arina Rodionova- Monica Niculescu / Elena-Gabriela Ruse → replaced by Vera Lapko / Lidziya Marozava
