Stadium: Quadra Joao Lima Round: 29 Ground: Clay
| Challenger Campinas - MD | 2021/11/20 16:00 | Matos/M R Alves v Romboli/Wild | 6-2,6-1 |
| Challenger Campinas - MD | 2021/11/19 21:45 | Matos/M R Alves v Alves/Gutierrez | 6-3,6-0 |
| Challenger Campinas - MD | 2021/11/17 17:40 | Matos/M R Alves v Reis da Silva/Ribeiro | 6-1,6-2 |
| Challenger Montevideo - MD | 2021/11/13 19:55 | Matos/M R Alves v Carou/Darderi | 6-4,6-4 |
| Challenger Montevideo - MD | 2021/11/12 21:20 | Matos/M R Alves v Cerundolo/Cuevas | 6-2,6-3 |
| Challenger Montevideo - MD | 2021/11/11 22:10 | Matos/M R Alves v Casanova/Rodriguez Taverna | 6-4,6-1 |
| Challenger Montevideo - MD | 2021/11/10 19:40 | Matos/M R Alves v Cid Subervi/Olivieri | 6-2,6-1 |
| Challenger Buenos Aires - MD | 2021/10/21 17:10 | Matos/M R Alves v Darderi/Torres | 6-7,6-2,6-10 |
| Challenger Campinas - MD | 2021/11/20 17:30 | Casanova/Rodriguez Taverna v Klier Junior/P De Almeida | 3-6,4-6 |
| Challenger Campinas - MD | 2021/11/18 17:40 | Cid Subervi/Sakamoto v Klier Junior/P De Almeida | 2-6,4-6 |
| Challenger Campinas - MD | 2021/11/17 21:30 | Klier Junior/P De Almeida v Luz/Martinez | 6-3,3-6,10-4 |
| Challenger Montevideo - MD | 2021/11/11 01:05 | Cerundolo/Cuevas v Klier Junior/P De Almeida | 6-3,6-2 |
| ITF - Kiseljak M25 - MD | 2021/05/29 13:30 | Reis da Silva/Sels v Klier Junior/P De Almeida | 4-6,6-4,10-4 |
| ITF - Kiseljak M25 - MD | 2021/05/28 17:00 | Basic/Fatic v Klier Junior/P De Almeida | 7-5,3-6,8-10 |
| ITF - Kiseljak M25 - MD | 2021/05/27 13:40 | Onclin/Riedi v Klier Junior/P De Almeida | 2-6,7-6,13-15 |
| ITF - Kiseljak M25 - MD | 2021/05/25 15:35 | Makk/Palovic v Klier Junior/P De Almeida | 0-6,1-6 |