Stadium: Court C Round: 62 Ground: Clay
| ITF M25 - Vic | 2021/05/17 09:00 | Miguel Damas v Martin Damm | 6-3,6-7,10-6 |
| ITF M15 - Valldoreix | 2021/05/13 08:00 | Tiago Cacao v Martin Damm | 3-6,6-1,6-4 |
| ITF M15 - Valldoreix | 2021/05/12 07:55 | Martin Damm v Vladyslav Orlov | 6-4,6-3 |
| Challenger - Tallahassee | 2021/04/20 20:30 | Jenson Brooksby v Martin Damm | 6-7,6-1,6-2 |
| Challenger - Orlando | 2021/04/13 20:20 | Michael Mmoh v Martin Damm | 6-4,4-6,6-1 |
| Challenger - Orlando | 2021/04/12 20:35 | Martin Damm v JC Aragone | 3-6,7-5,6-3 |
| Challenger - Orlando | 2021/04/12 14:00 | Hiroki Moriya v Martin Damm | 3-6,6-3,0-6 |
| ITF - M15 Opatija | 2021/03/25 10:55 | Martin Damm v Pavel Nejedly | 3-6,5-7 |
| ITF - M25 Jablonec nad Nisou | 2021/05/17 07:30 | Ondrej Horak v Tomas Papik | 1-6,4-6 |
| ITF - M25 Jablonec nad Nisou | 2021/05/16 08:30 | George Loffhagen v Ondrej Horak | 5-7,1-6 |
| ITF - M25 Praag | 2021/05/10 08:00 | Jan Satral v Ondrej Horak | 6-1,6-2 |
| ITF - M25 Praag | 2021/05/09 10:00 | Ondrej Horak v Jan Jermar | 7-6,6-3 |
| ITF M15 - Šibenik | 2021/04/20 08:00 | Alen Rogic-Hadzalic v Ondrej Horak | 6-1,6-4 |
| ITF M15 - Šibenik | 2021/04/19 12:15 | Ondrej Horak v Boris Butulija | 6-2,7-6 |
| ITF - M15 Sharm-el-Sheikh | 2021/03/24 11:20 | Ondrej Horak v Paul Jubb | 2-6,0-6 |
| ITF - M15 Sharm-el-Sheikh | 2021/03/15 07:30 | Niels Visker v Ondrej Horak | 6-7,7-6,13-11 |