Stadium: Court 2 Round: 44 Ground: Hardcourt outdoor
| ITF M25 Bakio | 2021/06/30 08:30 | Osgar O'Hoisin v Kaichi Uchida | 3-6,5-7 |
| ITF M25 Bakio | 2021/06/29 08:00 | Marco Brugnerotto v Osgar O'Hoisin | 2-6,6-4,8-10 |
| ITF M25 Bakio | 2021/06/27 15:40 | Antonio Prat v Osgar O'Hoisin | 2-6,2-6 |
| Davis Cup | 2021/06/19 08:00 | Aleksandre Bakshi v Osgar O'Hoisin | 6-4,6-3 |
| Davis Cup | 2021/06/18 09:20 | Osgar O'Hoisin v Liam Delicata | 6-4,6-2 |
| Davis Cup | 2021/06/17 07:50 | Valentin Vacherot v Osgar O'Hoisin | 6-3,6-4 |
| Davis Cup | 2021/06/16 08:00 | Chris Rodesch v Osgar O'Hoisin | 3-6,6-0,6-2 |
| ITF M15 Gaiba | 2021/06/09 14:05 | Cristian Rodriguez v Osgar O'Hoisin | 7-5,6-4 |
| 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 |
| ITF M15 Sibenik | 2021/05/17 11:00 | Martin Zeljenka v Martin Breysach | 6-7,3-6 |