Stadium: MTA 23 Round: 62 Ground: Clay
| ITF M15 Antalya | 2021/04/18 07:00 | Denis Klok v Noel Larwig | 5-7,0-6 |
| ITF M15 Shymkent | 2021/04/15 04:00 | Denis Klok v Ivan Gakhov | 5-7,6-7 |
| ITF M15 Shymkent | 2021/04/14 08:45 | Kirill Kolganov v Denis Klok | 4-6,1-6 |
| ITF M15 Shymkent | 2021/04/08 05:30 | Denis Klok v Dostanbek Tashbulatov | 2-6,4-6 |
| ITF M15 Shymkent | 2021/04/07 03:50 | Denis Klok v Islam Orynbasar | 6-1,6-2 |
| ITF M15 Kazan | 2021/03/09 12:15 | Sergey Fomin v Denis Klok | 6-2,6-4 |
| ITF M15 Antalya | 2021/02/07 06:00 | Benedikt Henning v Denis Klok | 6-1,6-1 |
| ITF M25 Villena | 2021/02/01 10:30 | Denis Klok v Alejandro Manzanera Pertusa | 2-6,2-6 |
| ITF M15 Antalya | 2021/04/19 09:00 | Gabriele Bosio v Vladislav Ivanov | 7-6,0-6,11-9 |
| ITF M25 Reus | 2021/04/12 07:30 | Vladislav Ivanov v Louis Dussin | 3-6,0-6 |
| ITF M25 Reus | 2021/04/11 11:00 | Lluc S Vinolas v Vladislav Ivanov | 0-6,0-6 |
| ITF M15 St Petersburg | 2021/02/08 08:30 | Alexander Vasilenko v Vladislav Ivanov | 6-4,6-2 |
| ITF M15 St Petersburg Qual | 2021/02/07 11:35 | Ivan Denisov v Vladislav Ivanov | 6-4,5-7,7-10 |
| ITF M15 St Petersburg | 2021/01/31 07:50 | Vladislav Ivanov v Alexandr Binda | 6-4,3-6,8-10 |
| ITF M15 Antalya | 2021/01/19 06:30 | Vladislav Ivanov v Billy Harris | 5-7,4-6 |
| ITF M15 Antalya | 2021/01/18 09:00 | Gianmarco Ferrari v Vladislav Ivanov | 6-4,6-7,3-10 |