Sofia Open · ATP
Sofia Open 2021
ATP 250Hard indoorSofia, Bulgaria26 September – 3 October 2021Prize money: 481,270 USD39 matchesAltitude: 555 mCourt: Fast
Champion Jannik Sinner · Final: 6-4 6-2
Final rounds
| Final | Jannik Sinner vs Gael Monfils | 6-3 6-4 |
| Semifinal | Jannik Sinner vs Filip Krajinovic | 6-3 7-5 |
| Semifinal | Gael Monfils vs Marcos Giron | 7-5 6-0 |
| Quarterfinal | Filip Krajinovic vs Kamil Majchrzak | 6-3 4-6 6-3 |
| Quarterfinal | Jannik Sinner vs James Duckworth | 7-6(4) 6-4 |
| Quarterfinal | Gael Monfils vs Gianluca Mager | 6-2 6-2 |
| Quarterfinal | Marcos Giron vs John Millman | 6-4 6-2 |
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