Stadium: Court 2 Round: 25 Ground: Clay
| ITF M25 Belgrade | 2021/06/27 07:00 | Denis Klok v George Botezan | 3-6,1-6 |
| ITF M15 Antalya | 2021/04/28 11:40 | Francesco Maestrelli v Denis Klok | 1-6,6-2,6-1 |
| ITF M15 Antalya | 2021/04/27 07:00 | Denis Klok v Vladimir Korolev | 6-1,4-6,10-3 |
| 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 | Denis Klok v Vladislav Ivanov | 6-1,7-6 |
| 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 Sofia | 2021/07/05 08:00 | Aleksandr Braynin v Maxim Krapivin | 6-4,6-3 |
| ITF M15 Novomoskovsk | 2021/06/04 14:00 | Aleksandr Braynin v Alex M Pujolras | 1-6,6-3,3-6 |
| ITF M15 Novomoskovsk | 2021/06/03 11:20 | Aleksandr Braynin v Benjamin Dhoe | 6-4,5-7,10-3 |
| ITF M15 Novomoskovsk | 2021/05/31 06:15 | Aleksandr Braynin v Simon Sedliak | 7-6,6-1 |
| ITF M15 Novomoskovsk | 2021/05/26 07:40 | Matteo Arnaldi v Aleksandr Braynin | 6-1,6-3 |
| ITF M15 Novomoskovsk | 2021/05/25 06:15 | Sergo Sikharulidze v Aleksandr Braynin | 2-6,0-6 |
| ITF M15 Novomoskovsk | 2021/05/25 06:15 | Martin Dimitrov v Aleksandr Braynin | 6-7,2-6 |
| ITF M15 Novomoskovsk | 2021/05/23 10:30 | Myroslav Bondar v Aleksandr Braynin | 4-6,1-6 |