Stadium: Estadio CIF Round: 64 Ground: Clay
| Challenger - Barcelone | 2020/10/03 13:10 | Brandon Nakashima v Clezar, Guilherme | 6-2,6-2 |
| Challenger - Split | 2020/09/27 08:00 | Clezar, Guilherme v Tomas Barrios Vera | 2-6,3-6 |
| Challenger - Split | 2020/09/26 13:55 | Clezar, Guilherme v Kekez, Duje | 6-2,6-3 |
| Forli 6, Italy | 2020/09/24 09:55 | Clezar, Guilherme v Andrea Pellegrino | 4-6,2-6 |
| Forli 6, Italy | 2020/09/23 10:45 | Federico Coria v Clezar, Guilherme | 6-7,7-6,4-6 |
| Forli 6, Italy | 2020/09/21 08:00 | Clezar, Guilherme v Bachinger, Matthias | 7-6,3-6,6-3 |
| ITF M25 Plaisir | 2020/09/18 11:00 | Igor Sijsling v Clezar, Guilherme | 6-4,6-4 |
| ITF M25 Plaisir | 2020/09/17 10:20 | Valentin Royer v Clezar, Guilherme | 7-6,6-7,4-6 |
| ITF M15 Setubal | 2020/10/04 13:00 | Monteiro, Joao v George Loffhagen | 6-7,6-7 |
| ITF M25 Porto | 2020/09/30 12:00 | Monteiro, Joao v Cacao, Tiago | 7-6,2-6,0-6 |
| ITF M15 Sintra | 2020/09/17 12:00 | Nicolas Alvarez Varona v Monteiro, Joao | 6-2,3-6,6-4 |
| ITF M15 Sintra | 2020/09/16 12:35 | Monteiro, Joao v Benjamin Lock | 6-1,4-6,6-3 |
| ITF M15 Sintra | 2020/09/10 10:20 | Monteiro, Joao v Ojeda Lara, Ricardo | 6-4,4-6,6-4 |
| ITF M15 Sintra | 2020/09/08 08:30 | Monteiro, Joao v Fermin Tenti | 6-3,6-7,6-2 |
| FPT Portugal Series | 2020/07/18 13:30 | Nuno Borges v Monteiro, Joao | 4-6,6-3,5-4 |
| FPT Portugal Series | 2020/07/17 12:00 | Monteiro, Joao v Gastao Elias | 6-2,6-5 |