Columbus 3 challenger · ATP
Columbus 3 challenger 2021
ChallengerHard indoorColumbus, United States19 September – 26 September 2021Prize money: 52,080 USD43 matchesAltitude: 227 mCourt: Medium-fast
Champion Stefan Kozlov · Final: 2-6 7-6(4) 6-4
Final rounds
| Final | Stefan Kozlov vs Max Purcell | 4-6 6-2 6-4 |
| Semifinal | Max Purcell vs Aleksandar Vukic | 7-6(3) 7-6(6) |
| Semifinal | Stefan Kozlov vs Jeffrey John Wolf | 2-6 6-3 7-5 |
| Quarterfinal | Max Purcell vs Nicolas Mejia | 6-4 3-6 6-0 |
| Quarterfinal | Aleksandar Vukic vs Alex Bolt | 7-5 6-4 |
| Quarterfinal | Jeffrey John Wolf vs Tennys Sandgren | 6-3 3-6 7-6(5) |
| Quarterfinal | Stefan Kozlov vs Mikael Torpegaard | 2-6 7-6(4) 6-4 |
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