Stadium: Court 8 Round: 26 Ground: Clay
| ITF M15 Monastir | 2020/10/26 08:30 | Oleksandr Ovcharenko v Constantin Bittoun Kouzmine | 6-4,6-2 |
| ITF M15 Cairo | 2021/07/21 08:00 | Constantin Bittoun Kouzmine v Ammar Alhaqbani | 4-6,7-5,6-2 |
| ITF M25 Velenje | 2021/07/07 08:00 | Oscar Jose Gutierrez v Constantin Bittoun Kouzmine | 4-6,6-3,6-4 |
| ITF M25 Velenje | 2021/07/06 08:00 | Constantin Bittoun Kouzmine v Lukas Palovic | 6-2,2-6,10-8 |
| ITF M25 Velenje | 2021/07/04 07:30 | Constantin Bittoun Kouzmine v Francisco Vittar | 7-5,6-1 |
| ITF M25 The Hague | 2021/07/01 17:00 | Constantin Bittoun Kouzmine v Tim Van Rijthoven | 5-7,4-6 |
| ITF M25 The Hague | 2021/07/01 07:30 | Sidane Pontjodikromo v Constantin Bittoun Kouzmine | 6-7,2-6 |
| ITF M25 The Hague | 2021/06/28 07:55 | Dominik Palan v Constantin Bittoun Kouzmine | 6-2,2-6,6-10 |
| ITF M25 The Hague | 2021/06/27 08:00 | Roland Stuurman v Constantin Bittoun Kouzmine | 2-6,1-6 |
| ITF M15 Cairo | 2021/07/21 08:00 | Oleksandr Ovcharenko v Alejo Lorenzo Lingua Lavallen | 6-3,3-6,6-3 |
| ITF M15 Doboj | 2021/07/15 08:00 | Dusan Obradovic v Oleksandr Ovcharenko | 2-6,6-4,6-4 |
| ITF M15 Doboj | 2021/07/13 10:00 | Tomislav Jotovski v Oleksandr Ovcharenko | 3-6,0-6 |
| ITF M15 Poprad | 2021/07/06 11:00 | Oleksandr Ovcharenko v Eric Vanshelboim | 2-6,2-6 |
| ITF M25 Wroclaw | 2021/06/28 11:00 | Davide Tortora v Oleksandr Ovcharenko | 6-4,6-4 |
| ITF M25 Wroclaw | 2021/06/27 11:00 | Mikolaj Borkowski v Oleksandr Ovcharenko | 4-6,0-6 |
| ITF M15 Novomoskovsk | 2021/06/04 07:00 | Matias Zukas v Oleksandr Ovcharenko | 6-3,6-1 |
| ITF M15 Novomoskovsk | 2021/06/03 15:30 | Oleksandr Ovcharenko v Timur Mukhtarulin | 6-1,6-4 |