Stadium: Court 2 Round: 54 Ground: Clay
| ITF M15 Troisdorf | 2021/05/09 08:00 | Luke Johnson v Mats Hermans | 6-1,6-4 |
| ITF M25 Meerbusch | 2021/04/13 11:30 | Marvin Netuschil v Mats Hermans | 6-4,6-1 |
| ITF M25 Meerbusch | 2021/04/12 13:00 | Johann Lars v Mats Hermans | 6-3,2-6,3-10 |
| ITF M25 Meerbusch | 2021/04/12 09:00 | Mats Hermans v Jurgen Briand | 6-3,2-6,11-9 |
| ITF M15 Antalya | 2021/04/04 06:30 | Marco Furlanetto v Mats Hermans | 6-1,6-0 |
| ITF M25 Trimbach | 2021/03/08 15:40 | Mats Hermans v Giovanni Agostinetto | 6-4,4-6,10-12 |
| Eastern European Championship | 2020/11/26 11:00 | Mats Hermans v Tuna Altuna | 3-6,1-6 |
| Eastern European Championship | 2020/11/25 15:45 | Nini Gabriel Dica v Mats Hermans | 3-6,6-3,6-4 |