Stadium: Court 7 Round: 62 Ground: Clay
| ITF M15 Parnu | 2021/08/02 08:00 | Martins Rocens v Matthias Uwe Kask | 6-4,6-1 |
| ITF M15 Sibenik | 2021/05/16 12:30 | Leon Benedict v Matthias Uwe Kask | 4-6,6-2,10-6 |
| ITF M15 Sibenik | 2021/04/19 13:50 | Matthias Uwe Kask v Luigi Castelletti | 5-7,6-2,15-17 |
| ITF M15 Opatija | 2021/03/21 11:00 | Matthias Uwe Kask v Bozo Barun | 2-6,4-6 |
| ITF M25 Prostejov | 2021/08/16 09:40 | Christopher Patzanovsky v Vojtech Mares | 6-2,6-0 |
| ITF M25 Most | 2021/05/24 08:00 | Petr Cervinka v Vojtech Mares | 3-6,6-0,11-9 |
| ITF M25 Most | 2021/05/23 08:00 | Kris Krawcewicz v Vojtech Mares | 4-6,5-7 |
| ITF M25 Jablonec Nad Nisou | 2021/05/17 07:30 | Vojtech Mares v Gianluca Coloma-Heck | 6-2,4-6,4-10 |
| ITF M25 Jablonec Nad Nisou | 2021/05/16 08:30 | Jiri Krouzek v Vojtech Mares | 4-6,5-7 |
| ITF M15 Antalya | 2021/04/26 07:00 | Denis Klok v Vojtech Mares | 6-3,6-2 |
| ITF M15 Antalya | 2021/04/25 07:00 | Flemming Peters v Vojtech Mares | 3-6,3-6 |
| ITF M15 Prague | 2019/11/05 09:00 | Oleksii Krutykh v Vojtech Mares | 6-2,6-1 |