Stadium: Court 10 Round: 25 Ground: Hardcourt outdoor
| ITF M15 - Caïro | 2021/09/09 08:00 | Seita Watanabe v Maxime Mora | 5-7,2-6 |
| ITF M15 - Caïro | 2021/09/08 08:00 | Seita Watanabe v Elbert Barr | 6-0,6-0 |
| ITF M15 - Caïro | 2021/09/01 09:50 | Fares Zakaria v Seita Watanabe | 6-2,7-6 |
| ITF - M15 Monastir | 2021/08/24 07:30 | Seita Watanabe v Kai Lemstra | 1-6,1-6 |
| ITF - M15 Monastir | 2021/08/23 09:00 | Seita Watanabe v Samir Hamza Reguig | 6-0,6-0 |
| ITF - M15 Monastir | 2021/08/22 11:00 | Seita Watanabe v Danila Moroz | 6-0,6-0 |
| ITF - M15 Monastir | 2021/08/17 07:30 | Jeremy Beale v Seita Watanabe | 6-7,6-3,10-7 |
| ITF - M15 Monastir | 2021/08/16 07:30 | Dylan Salton v Seita Watanabe | 0-6,2-6 |
| ITF M25 - Sintra | 2021/09/07 08:30 | Francisco Cabral v Leonardo Civita-Telles | 6-3,6-4 |
| ITF M25 - Sintra | 2021/09/06 10:35 | Jaime Faria v Leonardo Civita-Telles | 1-6,2-6 |
| ITF M15 Almada | 2021/07/04 10:30 | Leonardo Civita-Telles v Tomas Pinho | 4-6,3-6 |
| ITF - M15 Monastir | 2021/03/24 08:30 | Leonardo Civita-Telles v Hazem Naw | 6-4,3-6,5-7 |
| ITF - M15 Monastir | 2021/03/22 15:45 | Igor Marcondes v Leonardo Civita-Telles | 4-6,4-6 |
| ITF - M15 Monastir | 2021/03/22 10:30 | Edoardo Zanada v Leonardo Civita-Telles | 2-6,4-6 |
| ITF - M15 Monastir | 2021/03/21 17:00 | Antonio Campo v Leonardo Civita-Telles | 4-6,6-1,9-11 |
| ITF - M15 Monastir | 2021/03/16 10:15 | Leonardo Civita-Telles v Raphael Collignon | 1-6,5-7 |