Vienna Open · ATP
Vienna Open 2021
ATP 500Hard indoorVienna, Austria23 October – 31 October 2021Prize money: 2,089,338 EUR43 matchesAltitude: 196 mCourt: Medium-fast
Champion Alexander Zverev · Final: 6-1 6-7(2) 7-6(5)
Final rounds
| Final | Alexander Zverev vs Frances Tiafoe | 7-5 6-4 |
| Semifinal | Frances Tiafoe vs Jannik Sinner | 3-6 7-5 6-2 |
| Semifinal | Alexander Zverev vs Carlos Alcaraz | 6-3 6-3 |
| Quarterfinal | Jannik Sinner vs Casper Ruud | 7-5 6-1 |
| Quarterfinal | Frances Tiafoe vs Diego Schwartzman | 6-4 7-6(6) |
| Quarterfinal | Alexander Zverev vs Felix Auger Aliassime | 6-4 3-6 6-3 |
| Quarterfinal | Carlos Alcaraz vs Matteo Berrettini | 6-1 6-7(2) 7-6(5) |
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