Stadium: Centre Court Round: 25 Ground: Clay
| ITF - Rio do Sul M25 | 2021/10/20 14:45 | Gilbert S K Junior v Mateo Barreiros Reyes | 3-6,6-1,6-2 |
| ITF - Recife M15 | 2021/09/21 22:40 | Pedro Boscardin Dias v Mateo Barreiros Reyes | 6-2,6-2 |
| ITF - Medellin M25 | 2021/09/15 18:45 | Jose Pereira v Mateo Barreiros Reyes | 6-2,6-4 |
| ITF - Medellin M25 | 2021/09/13 20:00 | Mateo Barreiros Reyes v Sebastian Santibanez | 6-3,6-3 |
| ITF - Ibague M15 | 2021/09/08 17:00 | Juan A H Serrano v Mateo Barreiros Reyes | 7-6,6-4 |
| ITF - Ibague M15 | 2021/09/07 14:00 | Mateo Barreiros Reyes v William Yovanny Ribero Duarte | 6-0,6-4 |
| ITF - Ibague M15 | 2021/09/06 20:25 | Mateo Barreiros Reyes v Manuel Montoya Zuluaga | 6-1,6-2 |
| UTR Pro Tennis Series - Floryda | 2021/08/29 14:15 | Toby D. Boyer v Mateo Barreiros Reyes | 6-2,2-2 |
| ITF - Rio do Sul M25 | 2021/10/22 13:50 | Gustavo Heide v Nicolas Zanellato | 6-2,3-6,7-6 |
| ITF - Rio do Sul M25 | 2021/10/21 16:10 | Nicolas Zanellato v Oscar Jose Gutierrez | 6-7,6-1,6-1 |
| ITF - Rio do Sul M25 | 2021/10/20 16:30 | Nicolas Zanellato v Caio Gruber | 6-2,6-1 |
| ITF - Recife M15 | 2021/09/24 15:25 | Eduardo Ribeiro v Nicolas Zanellato | 6-4,6-7,6-3 |
| ITF - Recife M15 | 2021/09/23 13:30 | Nicolas Zanellato v Joao Eduardo Schiessl | 7-5,6-0 |
| ITF - Recife M15 | 2021/09/22 17:40 | Daniel V C Rebelo v Nicolas Zanellato | 0-6,1-6 |
| ITF - Monastir M15 | 2021/09/05 09:30 | Timur Kiyamov v Nicolas Zanellato | 6-0,6-2 |
| ITF - Monastir M15 | 2021/08/29 09:30 | Nicolas Zanellato v Alec Beckley | 4-6,2-6 |