Stadium: Court 1 Round: 25 Ground: Hardcourt outdoor
| ITF M25 Idanha-A-Nova | 2021/07/20 10:45 | Anton Matusevich v Naoki Tajima | 6-3,7-5 |
| ITF M25 Idanha-A-Nova | 2021/07/15 09:30 | Daniel Rodrigues v Naoki Tajima | 6-3,7-5 |
| ITF M25 Idanha-A-Nova | 2021/07/14 09:25 | Fabio Coelho v Naoki Tajima | 6-4,4-6,2-6 |
| ITF M15 Almada | 2021/07/07 10:30 | Naoki Tajima v Martim L Prata | 3-6,2-6 |
| ITF M15 Kouvola | 2021/05/30 08:00 | Anton Matusevich v Naoki Tajima | 6-1,4-6,6-0 |
| ITF M15 Kouvola | 2021/05/29 07:00 | Naoki Tajima v Lorenzo Rottoli | 7-5,6-4 |
| ITF M15 Kouvola | 2021/05/28 07:15 | Luca Castelnuovo v Naoki Tajima | 3-6,2-6 |
| ITF M15 Kouvola | 2021/05/27 08:30 | Aleksi Lofman v Naoki Tajima | 6-3,6-7,4-6 |
| ITF M25 Idanha-A-Nova | 2021/07/11 10:30 | Osgar O'Hoisin v Martin Breysach | 6-4,6-4 |
| ITF M15 Almada | 2021/07/07 08:30 | Martin Breysach v Harry Wendelken | 3-6,3-6 |
| ITF M15 Heraklion | 2021/06/09 13:00 | Yaron Guberman v Martin Breysach | 3-6,1-6 |
| ITF M15 Heraklion | 2021/06/03 09:30 | Nicolas Alvarez Varona v Martin Breysach | 6-3,6-3 |
| ITF M15 Heraklion | 2021/06/01 08:00 | Aristotelis Thanos v Martin Breysach | 3-6,3-6 |
| ITF M15 Heraklion | 2021/05/26 11:55 | Yshai Oliel v Martin Breysach | 6-2,6-0 |
| ITF M15 Sibenik | 2021/05/19 17:05 | Martin Breysach v Jose Fco. Vidal Azorin | 6-4,3-6,2-6 |
| ITF M15 Sibenik | 2021/05/18 08:00 | Jaimee Floyd Angele v Martin Breysach | 7-5,6-1 |