2021 Kremlin Cup – Women's doubles
Tennis event in Moscow, Russia
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Shuko Aoyama and Ena Shibahara were the defending champions, having won the previous event in 2019,[1] but chose not to participate.
Champions
Jeļena Ostapenko
Kateřina Siniaková
Jeļena Ostapenko
Kateřina SiniakováRunners-up
Nadiia Kichenok
Raluca Olaru
Nadiia Kichenok
Raluca OlaruScore6–2, 4–6, [10–8]
| Women's doubles | |
|---|---|
| 2021 Kremlin Cup | |
| Champions | Jeļena Ostapenko Kateřina Siniaková |
| Runners-up | Nadiia Kichenok Raluca Olaru |
| Score | 6–2, 4–6, [10–8] |
Jeļena Ostapenko and Kateřina Siniaková won the title, defeating Nadiia Kichenok and Raluca Olaru in the final, 6–2, 4–6, [10–8].[2] Ostapenko and Siniaková won the title after saving three match points in their quarterfinal match against Viktória Kužmová and Alexandra Panova. This was the first time that Siniaková won a doubles title without regular partner Barbora Krejčíková since January 2019.[3]
Seeds
Alexa Guarachi / 
Desirae Krawczyk (first round)- Jeļena Ostapenko / Kateřina Siniaková (champions)
- Marie Bouzková / Lucie Hradecká (semifinals)
- Nadiia Kichenok / Raluca Olaru (final)
Draw
Key
- Q = Qualifier
- WC = Wild card
- LL = Lucky loser
- Alt = Alternate
- ITF = ITF entry
- PR = Protected ranking
- SR = Special ranking
- SE = Special exempt
- JE = Junior exempt
- JR = Junior Accelerator Programme entrant
- CO = College Accelerator Programme entrant
- NG = Next Gen Accelerator Program entrant
- w/o = Walkover
- r = Retired
- d = Defaulted
Draw
| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 |  A Guarachi D Krawczyk
| 3 | 1 | ||||||||||||||||||||||||
 E Alexandrova Y Sizikova
| 6 | 6 | E Alexandrova Y Sizikova
| 1 | 6 | [7] | |||||||||||||||||||||
| WC | O Selekhmeteva A Tikhonova
| 4 | 7 | [8] | N Dzalamidze K Rakhimova
| 6 | 4 | [10] | |||||||||||||||||||
| N Dzalamidze K Rakhimova
| 6 | 5 | [10] | N Dzalamidze K Rakhimova
| 5 | 5 | |||||||||||||||||||||
| 4 | N Kichenok R Olaru
| 0 | 6 | [10] | 4 | N Kichenok R Olaru
| 7 | 7 | |||||||||||||||||||
| T Martincová M Vondroušová
| 6 | 2 | [4] | 4 | N Kichenok R Olaru
| 5 | |||||||||||||||||||||
K Christian E Routliffe
| 4 | 0 | A Kalinskaya A Potapova
| 2r | |||||||||||||||||||||||
| A Kalinskaya A Potapova
| 6 | 6 | 4 | N Kichenok R Olaru
| 2 | 6 | [8] | ||||||||||||||||||||
 E Lechemia S Santamaria
| 1 | 6 | [7] | 2 | J Ostapenko K Siniaková
| 6 | 4 | [10] | |||||||||||||||||||
 O Kalashnikova M Kato
| 6 | 4 | [10] | O Kalashnikova M Kato
| 4 | 2 | |||||||||||||||||||||
 A Danilina Ar Rodionova
| 1 | 1 | 3 | M Bouzková L Hradecká
| 6 | 6 | |||||||||||||||||||||
| 3 | M Bouzková L Hradecká
| 6 | 6 | 3 | M Bouzková L Hradecká
| 2 | 7 | [2] | |||||||||||||||||||
 V Kužmová A Panova
| 7 | 6 | 2 | J Ostapenko K Siniaková
| 6 | 5 | [10] | ||||||||||||||||||||
| V Diatchenko M Niculescu
| 5 | 2 | V Kužmová A Panova
| 7 | 3 | [9] | |||||||||||||||||||||
| PR |  V Lapko L Marozava
| 3 | 2 | 2 | J Ostapenko K Siniaková
| 5 | 6 | [11] | |||||||||||||||||||
| 2 | J Ostapenko K Siniaková
| 6 | 6 | ||||||||||||||||||||||||