Cincinnati Open · ATP
Cincinnati Open 2021
Masters 1000HardMason, United States14 August – 22 August 2021Prize money: 5,404,435 USD76 matchesAltitude: 249 mCourt: Fast
Champion Alexander Zverev · Final: 6-2 3-6 6-3
Final rounds
| Final | Alexander Zverev vs Andrey Rublev | 6-2 6-3 |
| Semifinal | Alexander Zverev vs Stefanos Tsitsipas | 6-4 3-6 7-6(4) |
| Semifinal | Andrey Rublev vs Daniil Medvedev | 2-6 6-3 6-3 |
| Quarterfinal | Alexander Zverev vs Casper Ruud | 6-1 6-3 |
| Quarterfinal | Stefanos Tsitsipas vs Felix Auger Aliassime | 6-2 5-7 6-1 |
| Quarterfinal | Daniil Medvedev vs Pablo Carreno-Busta | 6-1 6-1 |
| Quarterfinal | Andrey Rublev vs Benoit Paire | 6-2 3-6 6-3 |
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