Rio de Janeiro challenger 2021
ChallengerHardRio de Janeiro, Brazil12 December – 19 December 2021Prize money: 52,080 USD43 matchesAltitude: 12 mCourt: Slow
Champion Kaichi Uchida · Final: 6-4 6-1
Final rounds
| Final | Kaichi Uchida vs Nicolas Alvarez Varona | 3-6 6-3 7-6(3) |
| Semifinal | Nicolas Alvarez Varona vs Nicolas Kicker | 6-2 7-5 |
| Semifinal | Kaichi Uchida vs Gabriel Decamps | 6-2 6-3 |
| Quarterfinal | Nicolas Kicker vs Mateus (2001) Alves | 3-6 7-6(4) 6-4 |
| Quarterfinal | Nicolas Alvarez Varona vs Roy Smith | 6-4 6-4 |
| Quarterfinal | Gabriel Decamps vs Daniel Dutra da Silva | 6-4 4-6 6-2 |
| Quarterfinal | Kaichi Uchida vs Thiago Seyboth Wild | 6-4 6-1 |
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