Stadium: Court 2 Round: 25 Ground: Hardcourt outdoor
| 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 |
| ITF M15 - Sibenik | 2021/05/17 11:00 | Martin Zeljenka v Martin Breysach | 6-7,3-6 |
| ITF M15 - Sibenik | 2021/05/16 10:00 | Rafael Kis Balazs v Martin Breysach | 0-6,4-6 |
| ITF M15 - Almada | 2021/07/05 10:00 | Harry Wendelken v Luigi Castelletti | 6-0,6-0 |
| ITF M15 - Almada | 2021/07/04 10:30 | Harry Wendelken v Andre Rodeia | 7-6,6-1 |
| ITF M15 - Heraklion | 2021/06/07 09:00 | Harry Wendelken v Giles Hussey | 4-6,3-6 |
| ITF M15 - Heraklion | 2021/05/27 06:30 | Luke Johnson v Harry Wendelken | 6-2,6-7,6-3 |
| ITF M15 - Heraklion | 2021/05/26 10:10 | Harry Wendelken v Pablo Vivero Gonzalez | 6-4,6-1 |
| ITF M15 - Heraklion | 2021/05/25 06:30 | Runhao Hua v Harry Wendelken | 6-2,6-1 |
| ITF M15 - Heraklion | 2021/05/23 06:30 | Ioannis Papounidis v Harry Wendelken | 6-4,3-6,3-10 |
| ITF - M15 - Monastir | 2021/05/04 08:00 | Zachary Svajda v Harry Wendelken | 7-5,6-1 |