Stadium: Court 1 Round: 25 Ground: Clay
| ITF M15 Sofia | 2021/07/09 07:00 | Nikita Mashtakov v Madaras, Dragos Nicolae | 5-7,2-6 |
| ITF M15 Sofia | 2021/07/08 09:00 | Nikita Mashtakov v Aleksandr Braynin | 6-4,6-2 |
| ITF M15 Sofia | 2021/07/07 13:10 | Nikita Mashtakov v Mihai Razvan Marinescu | 3-6,6-1,6-1 |
| ITF M15 Novomoskovsk | 2021/06/03 18:30 | Nikita Mashtakov v Podzus, Martins | 4-6,1-6 |
| ITF M15 Novomoskovsk | 2021/05/28 07:15 | Felix Gill v Nikita Mashtakov | 7-5,6-7,6-4 |
| ITF M15 Novomoskovsk | 2021/05/27 07:15 | Bielinskyi, Oleksandr v Nikita Mashtakov | 6-3,1-6,5-7 |
| ITF M15 Novomoskovsk | 2021/05/26 06:15 | Nikita Mashtakov v Podzus, Martins | 5-7,6-3,6-4 |
| Sibenik, Singles M-ITF-CRO-05A | 2021/05/20 11:00 | Nikita Mashtakov v Kocevar-Desman, Tom | 5-7,4-6 |
| ITF M15 Chornomorsk | 2021/08/30 10:30 | Mathieu Scaglia v Artem Podorozhnyi | 5-7,6-3,3-10 |
| ITF M15 Chornomorsk | 2021/08/30 07:00 | Artem Podorozhnyi v Ilnytskyy, Svyatoslav | 6-3,6-4 |
| ITF M15 Chornomorsk | 2021/08/29 09:30 | Artem Podorozhnyi v Davud Amirov | 6-3,6-1 |
| ITF M15 Novomoskovsk | 2021/05/25 12:30 | Dembek, Michal v Artem Podorozhnyi | 6-1,6-2 |