Stadium: Court 2 Round: 25 Ground: Hardcourt outdoor
| ITF - M15 Héraklion | 2021/06/09 13:00 | Guberman, Yaron v Breysach , Martin | 3-6,1-6 |
| ITF - M15 Héraklion | 2021/06/03 09:30 | Nicolas Alvarez Varona v Breysach , Martin | 6-3,6-3 |
| ITF - M15 Héraklion | 2021/06/01 08:00 | Aristotelis Thanos v Breysach , Martin | 3-6,3-6 |
| ITF - M15 Héraklion | 2021/05/26 11:55 | Yshai Oliel v Breysach , Martin | 6-2,6-0 |
| Sibenik, Singles M-ITF-CRO-05A | 2021/05/19 17:05 | Breysach , Martin v Vidal Azorin, Jose Fco | 6-4,3-6,2-6 |
| Sibenik, Singles M-ITF-CRO-05A | 2021/05/18 08:00 | Jaimee Floyd Angele v Breysach , Martin | 7-5,6-1 |
| Sibenik, Singles M-ITF-CRO-05A | 2021/05/17 11:00 | Martin Zeljenka v Breysach , Martin | 6-7,3-6 |
| Sibenik, Singles M-ITF-CRO-05A | 2021/05/16 10:00 | Kis Balazs, Rafael v Breysach , Martin | 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 Rodeia, Andre | 7-6,6-1 |
| ITF - M15 Héraklion | 2021/06/07 09:00 | Harry Wendelken v Giles Hussey | 4-6,3-6 |
| ITF - M15 Héraklion | 2021/05/27 06:30 | Johnson, Luke v Harry Wendelken | 6-2,6-7,6-3 |
| ITF - M15 Héraklion | 2021/05/26 10:10 | Harry Wendelken v Vivero Gonzalez, Pablo | 6-4,6-1 |
| ITF - M15 Héraklion | 2021/05/25 06:30 | Runhao Hua v Harry Wendelken | 6-2,6-1 |
| ITF - M15 Héraklion | 2021/05/23 06:30 | Papounidis, Ioannis 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 |