Stadium: Court 4 Round: 25 Ground: Hardcourt outdoor
| ITF M25 Grasse | 2021/06/17 11:30 | Franco Agamenone v Mathys Erhard | 6-4,7-6 |
| ITF M25 Grasse | 2021/06/16 16:10 | Mathys Erhard v Christian Lindell | 2-6,6-2,7-5 |
| ITF M25 Grasse | 2021/06/14 14:30 | Thomas Deschamps v Mathys Erhard | 3-6,4-6 |
| ITF M25 Grasse | 2021/06/14 07:30 | Robin Bertrand v Mathys Erhard | 2-6,6-1,6-10 |
| ITF M25 Grasse | 2021/06/13 09:35 | Mathis Bondaz v Mathys Erhard | 0-6,1-6 |
| Challenger Lyon | 2021/06/06 11:05 | Alexey Vatutin v Mathys Erhard | 6-4,6-4 |
| ITF M15 Antalya | 2021/05/05 10:10 | Mathys Erhard v Cheong-Eui Kim | 4-6,6-2,4-6 |
| ITF M15 Antalya | 2021/04/25 07:00 | Mathys Erhard v Gabriele Bosio | 6-4,4-6,6-10 |
| 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 |
| ITF M15 Sibenik | 2021/05/17 11:00 | Martin Zeljenka v Martin Breysach | 6-7,3-6 |