Astana 4 challenger · ATP
Astana 4 challenger 2021
ChallengerHardAstana, Kazakhstan11 July – 18 July 2021Prize money: 52,080 USD43 matchesAltitude: 357 mCourt: Slow
Champion Max Purcell · Final: 6-2 1-6 7-6(4)
Final rounds
| Final | Max Purcell vs Jay Clarke | 3-6 6-4 7-6(6) |
| Semifinal | Jay Clarke vs Borna Gojo | 6-4 6-4 |
| Semifinal | Max Purcell vs Peter Polansky | 7-5 3-6 7-6(3) |
| Quarterfinal | Jay Clarke vs Jason Kubler | 3-6 7-5 7-6(1) |
| Quarterfinal | Borna Gojo vs Mirza Basic | 2-6 7-6(2) 6-2 |
| Quarterfinal | Max Purcell vs Yu Hsiou Hsu | 6-2 6-1 |
| Quarterfinal | Peter Polansky vs Roman Safiullin | 6-2 1-6 7-6(4) |
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