Stadium: Court 18 Round: 25 Ground: Clay
| 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 M15 Ibague | 2021/09/08 17:00 | Juan A H Serrano v Mateo Barreiros Reyes | 7-6,6-4 |
| ITF M15 Ibague | 2021/09/07 14:00 | Mateo Barreiros Reyes v William Yovanny Ribero Duarte | 6-0,6-4 |
| ITF M15 Ibague | 2021/09/06 20:25 | Mateo Barreiros Reyes v Manuel Montoya Zuluaga | 6-1,6-2 |
| UTR Pro Tennis Series Florida | 2021/08/29 14:15 | Toby D. Boyer v Mateo Barreiros Reyes | 6-2,2-2 |
| UTR Pro Tennis Series Florida | 2021/08/28 13:30 | Omar Maldonado v Mateo Barreiros Reyes | 3-6,4-5 |
| 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 |
| ITF M25 Sintra | 2021/09/05 12:00 | Paulo A S Dos Santos v Illia Stoliar | 6-2,6-2 |
| ITF M15 Oldenzaal | 2021/08/15 07:30 | Jarno Jans v Paulo A S Dos Santos | 7-5,6-1 |
| ITF M15 Xativa | 2021/08/01 13:00 | Paulo A S Dos Santos v Alexis Boureau | 2-6,3-6 |
| ITF M15 Castelo Branco | 2021/07/26 08:30 | Clement Chidekh v Paulo A S Dos Santos | 7-6,6-1 |