Tulln challenger · ATP
Tulln challenger 2021
ChallengerClayTulln an der Donau, Austria5 September – 11 September 2021Prize money: 88,520 EUR43 matchesAltitude: 178 mCourt: Medium-slow
Champion Mats Moraing · Final: 7-6(5) 7-5
Final rounds
| Final | Mats Moraing vs Hugo Gaston | 6-2 6-1 |
| Semifinal | Mats Moraing vs Jiri Vesely | 3-6 7-5 6-3 |
| Semifinal | Hugo Gaston vs Kamil Majchrzak | 6-3 3-6 6-4 |
| Quarterfinal | Mats Moraing vs Thiago Monteiro | 6-1 0-6 7-6(5) |
| Quarterfinal | Hugo Gaston vs Filip Misolic | 6-0 2-6 6-3 |
| Quarterfinal | Jiri Vesely vs Dennis Novak | 6-3 6-3 |
| Quarterfinal | Kamil Majchrzak vs Marc-Andrea Huesler | 7-6(5) 7-5 |
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