Buenos Aires challenger · ATP
Buenos Aires challenger 2021
ChallengerClayBuenos Aires, Argentina17 October – 24 October 2021Prize money: 52,080 USD43 matchesAltitude: 19 mCourt: Slow
Champion Sebastian Baez · Final: 6-4 3-6 7-5
Final rounds
| Final | Sebastian Baez vs Thiago Monteiro | 6-4 6-0 |
| Semifinal | Sebastian Baez vs Juan Manuel Cerundolo | 6-1 6-2 |
| Semifinal | Thiago Monteiro vs Francisco Cerundolo | 6-1 2-6 6-3 |
| Quarterfinal | Juan Manuel Cerundolo vs Hugo Dellien | 2-6 7-5 7-6(5) |
| Quarterfinal | Sebastian Baez vs Juan Pablo Varillas | 7-5 6-2 |
| Quarterfinal | Francisco Cerundolo vs Martin Cuevas | 6-1 6-1 |
| Quarterfinal | Thiago Monteiro vs Tomas Martin Etcheverry | 6-4 3-6 7-5 |
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