Nur-Sultan 4 challenger · ATP
Nur-Sultan 4 challenger 2021
ChallengerHardNur-Sultan, Kazakhstan18 July – 25 July 2021Prize money: 52,080 USD42 matchesAltitude: 357 mCourt: Medium-slow
Champion Andrey Kuznetsov · Final: 6-2 3-6 6-2
Final rounds
| Final | Andrey Kuznetsov vs Jason Kubler | 6-3 2-1 ret. |
| Semifinal | Andrey Kuznetsov vs Pavel Kotov | 6-2 6-7(4) 6-4 |
| Semifinal | Jason Kubler vs Oleksii Krutykh | 6-1 6-3 |
| Quarterfinal | Pavel Kotov vs Ryan Peniston | 6-4 6-2 |
| Quarterfinal | Jason Kubler vs Hugo Grenier | 7-6(4) 6-1 |
| Quarterfinal | Oleksii Krutykh vs Nick Chappell | 3-6 6-3 7-5 |
| Quarterfinal | Andrey Kuznetsov vs Peter Polansky | 6-2 3-6 6-2 |
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