Stadium: Court 1 Round: 14 Ground: Clay
| Challenger Florianopolis | 2021/12/07 13:00 | Federico Zeballos v Hugo Dellien | 6-7,2-6 |
| Challenger Florianopolis | 2021/12/06 13:00 | Pedro Sakamoto v Federico Zeballos | 5-7,1-6 |
| Challenger Florianopolis | 2021/12/05 12:30 | Luca Castelnuovo v Federico Zeballos | 3-6,1-6 |
| Challenger Sao Paulo | 2021/11/28 13:00 | Eduardo Ribeiro v Federico Zeballos | 6-4,7-6 |
| Challenger Brasilia | 2021/11/22 13:00 | Bogdan Bobrov v Federico Zeballos | 6-3,6-3 |
| Challenger Brasilia | 2021/11/21 13:00 | Joao Vieira v Federico Zeballos | 0-6,3-6 |
| Challenger Guayaquil | 2021/10/31 16:00 | Nicolas Alvarez v Federico Zeballos | 6-1,6-0 |
| Challenger Buenos Aires | 2021/10/17 17:15 | Guido Ivan Justo v Federico Zeballos | 6-2,6-1 |
| Challenger Brasilia | 2021/11/21 14:35 | Luciano Darderi v Paulo A S Dos Santos | 6-2,6-3 |
| ITF M25 - Aparecida De Goiania | 2021/11/11 19:15 | Daniel Dutra Da Silva v Paulo A S Dos Santos | 5-7,6-3,6-1 |
| ITF M25 - Aparecida De Goiania | 2021/11/09 13:10 | Mateo Barreiros Reyes v Paulo A S Dos Santos | 6-7,4-6 |
| ITF M25 - Aparecida De Goiania | 2021/11/08 14:30 | Tobias Franco v Paulo A S Dos Santos | 6-4,1-6,2-10 |
| ITF M15 - Brasilia | 2021/11/02 12:00 | Joao Eduardo Schiessl v Paulo A S Dos Santos | 6-1,7-5 |
| ITF M25 - Quinta Do Lago | 2021/10/17 10:00 | Goncalo Falcao v Paulo A S Dos Santos | 6-1,6-4 |
| ITF M25 - Loule | 2021/10/10 13:00 | Paulo A S Dos Santos v Miguel Gomes | 5-7,1-6 |
| ITF M25 - Setubal | 2021/10/06 14:15 | Illia Stoliar v Paulo A S Dos Santos | 1-6,6-1,7-6 |