Stadium: Court 6 Round: 25 Ground: Clay
| ITF M15 Nules | 2021/11/16 12:15 | Denis Klok v Carlos Sanchez Jover | 4-6,1-6 |
| ITF M15 Antalya | 2021/11/03 13:05 | Mircea-Alexandru Jecan v Denis Klok | 6-2,6-1 |
| ITF M15 Antalya | 2021/10/27 11:35 | Marlon Vankan v Denis Klok | 6-0,6-0 |
| ITF M15 Antalya | 2021/10/18 12:45 | Denis Klok v Radovan Michalik | 1-6,0-6 |
| 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 |