2021 Astana Open – Men's doubles
Tennis tournament
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Sander Gillé and Joran Vliegen were the defending champions,[1] but chose not to participate this year.
| Men's doubles | |
|---|---|
| 2021 Astana Open | |
| Champions |  Santiago González  Andrés Molteni |
| Runners-up |  Jonathan Erlich  Andrei Vasilevski |
| Score | 6–1, 6–2 |
Santiago González and Andrés Molteni won the title, defeating Jonathan Erlich and Andrei Vasilevski in the final, 6–1, 6–2.
Seeds
Santiago González / 
Andrés Molteni (champions)
Andrey Golubev / Aleksandr Nedovyesov (quarterfinals)
Marcelo Demoliner / Rafael Matos (first round)
André Göransson / 
Andrea Vavassori (quarterfinals)
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 | S González A Molteni
| 6 | 65 | [10] | |||||||||||||||||||||||
| WC |  D Popko T Skatov
| 4 | 77 | [6] | 1 | S González A Molteni
| 5 | 6 | [10] | ||||||||||||||||||
 D Pel  A-u-H Qureshi
| 64 | 3 |  L Glasspool  H Heliövaara
| 7 | 4 | [8] | |||||||||||||||||||||
| L Glasspool H Heliövaara
| 77 | 6 | 1 | S González A Molteni
| 6 | 6 | |||||||||||||||||||||
| 4 |  A Göransson  A Vavassori
| 6 | 4 | [11] |  R Berankis  A Sitak
| 4 | 0 | ||||||||||||||||||||
 A Begemann  N Lammons
| 4 | 6 | [9] | 4 | A Göransson A Vavassori
| 5 | 6 | [7] | |||||||||||||||||||
| R Berankis A Sitak
| 7 | 6 | R Berankis A Sitak
| 7 | 3 | [10] | |||||||||||||||||||||
| E Ruusuvuori A Seppi
| 5 | 3 | 1 | S González A Molteni
| 6 | 6 | |||||||||||||||||||||
 J Munar  M Polmans
| 77 | 4 | [10] | J Erlich A Vasilevski
| 1 | 2 | |||||||||||||||||||||
| WC | A Bublik  D Golubev
| 65 | 6 | [8] | J Munar M Polmans
| 1 | 2 | ||||||||||||||||||||
| J Erlich A Vasilevski
| 6 | 1 | [10] | J Erlich A Vasilevski
| 6 | 6 | |||||||||||||||||||||
| 3 |  M Demoliner R Matos
| 1 | 6 | [7] | J Erlich A Vasilevski
| 79 | 77 | ||||||||||||||||||||
 R Arneodo  B Bonzi
| 6 | 7 | R Arneodo B Bonzi
| 67 | 65 | ||||||||||||||||||||||
 R Jebavý J Veselý
| 3 | 5 | R Arneodo B Bonzi
| 6 | 4 | [10] | |||||||||||||||||||||
| J Duckworth M Ebden
| 67 | 2 | 2 | A Golubev A Nedovyesov
| 4 | 6 | [7] | ||||||||||||||||||||
| 2 | A Golubev A Nedovyesov
| 79 | 6 | ||||||||||||||||||||||||