Stadium: Court 18 Round: 25 Ground: Clay
| ITF M25 Aparecida De Goiania | 2021/11/08 16:00 | Gabriel Batagin v Mateo Barreiros Reyes | 3-6,2-6 |
| ITF M25 Aparecida De Goiania | 2021/11/07 17:00 | Gustavo Teisen Pereira v Mateo Barreiros Reyes | 4-6,2-6 |
| ITF M15 Brasilia | 2021/11/04 14:25 | Mateo Barreiros Reyes v Conner Huertas Del Pino | 2-6,4-6 |
| ITF M15 Brasilia | 2021/11/03 18:00 | Mateo Barreiros Reyes v Nicolas Zanellato | 7-6,2-6,6-4 |
| ITF M25 Rio do Sul | 2021/10/20 14:45 | Gilbert S K Junior v Mateo Barreiros Reyes | 3-6,6-1,6-2 |
| ITF M15 Recife | 2021/09/21 22:40 | Pedro Boscardin Dias v Mateo Barreiros Reyes | 6-2,6-2 |
| ITF M25 Medellin | 2021/09/15 18:45 | Jose Pereira v Mateo Barreiros Reyes | 6-2,6-4 |
| ITF M25 Medellin | 2021/09/13 20:00 | Mateo Barreiros Reyes v Sebastian Santibanez | 6-3,6-3 |
| 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 |
| ITF M25 Setubal | 2021/10/05 11:20 | Alberto Morolli v Paulo A S Dos Santos | 6-4,1-6,6-10 |
| ITF M25 Setubal | 2021/10/04 10:00 | Martim Simoes v Paulo A S Dos Santos | 2-6,6-4,8-10 |
| ITF M25 Sintra | 2021/09/06 13:30 | Paulo A S Dos Santos v Henrik Heise Korsgaard | 7-5,5-7,6-10 |