Stadium: Court 21 Round: 62 Ground: Clay
| ITF M15 - Antalya | 2021/10/17 07:00 | Denis Klok v Sven Corbinais | 6-4,6-4 |
| ITF M15 - Antalya | 2021/10/12 07:00 | Lukas Palovic v Denis Klok | 4-6,6-0,6-3 |
| ITF M25 - Skopje | 2021/09/28 11:15 | Denis Klok v Andrey Chepelev | 2-6,1-6 |
| ITF M15 - Pirot | 2021/09/23 08:00 | Denis Klok v Kristijan Juhas | 1-6,0-6 |
| ITF M15 - Zlatibor | 2021/09/14 09:30 | Denis Klok v Lukas Palovic | 3-6,3-6 |
| ITF M25 - Denia | 2021/07/25 08:00 | Denis Klok v Lorenzo Joaquin Rodriguez | 6-7,1-6 |
| ITF M25 - Gandia | 2021/07/19 09:00 | Denis Klok v Nacho Serra Sanchez | 6-7,6-0,2-10 |
| ITF M25 - Gandia | 2021/07/18 07:00 | Denis Klok v Hans Albert Schubert | 6-3,6-2 |
| ITF M15 - Antalya | 2021/10/17 07:00 | Radovan Michalik v Adrian Mateo Bejenaru | 6-4,5-7,10-8 |
| ITF M25 - Budapest | 2021/09/26 08:00 | Nicolas Parizzia v Radovan Michalik | 6-1,7-5 |
| ITF M25 - Pardubice | 2021/09/19 10:00 | Radovan Michalik v Vitek Horak | 6-7,3-6 |
| ITF M15 - Zilina | 2021/08/31 07:30 | Kristof Minarik v Radovan Michalik | 6-2,6-2 |
| ITF M15 - Zilina | 2021/08/30 07:30 | Radovan Michalik v Eric Morris | 7-6,4-6,10-6 |
| ITF M15 - Bratislava | 2021/08/23 09:00 | Jiri Barnat v Radovan Michalik | 7-5,6-0 |
| ITF M15 - Poprad | 2021/07/04 08:00 | Timo Stodder v Radovan Michalik | 6-2,6-2 |
| ITF M15 - Bratislava | 2021/03/08 15:00 | Jakub Kroslak v Radovan Michalik | 6-1,1-6,10-7 |