Champaign challenger · ATP
Champaign challenger 2021
ChallengerHard indoorChampaign, United States14 November – 21 November 2021Prize money: 52,080 USD43 matchesAltitude: 227 mCourt: Slow
Champion Stefan Kozlov · Final: 6-2 6-1
Final rounds
| Final | Stefan Kozlov vs Aleksandar Vukic | 5-7 6-3 6-4 |
| Semifinal | Stefan Kozlov vs Jeffrey John Wolf | 6-2 6-3 |
| Semifinal | Aleksandar Vukic vs Yosuke Watanuki | 7-6(8) 6-4 |
| Quarterfinal | Stefan Kozlov vs Mitchell Krueger | 6-4 6-4 |
| Quarterfinal | Aleksandar Vukic vs Go Soeda | 6-2 6-2 |
| Quarterfinal | Jeffrey John Wolf vs Vasil Kirkov | 6-3 6-2 |
| Quarterfinal | Yosuke Watanuki vs Ben Shelton | 6-2 6-1 |
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