Stadium: Court 3 Round: 25 Ground: Clay
| ITF - M15 Novomoskovsk | 2021/05/25 08:45 | Gabriel Donev v Alexander Zgirovsky | 6-4,6-2 |
| ITF - M15 Novomoskovsk | 2021/05/31 13:45 | Alexander Zgirovsky v Piotr Pawlak | 6-3,6-1 |
| ITF - M15 Novomoskovsk | 2021/05/31 06:15 | Alexander Zgirovsky v Dmitrii Vasilev | 6-1,6-1 |
| ITF - M15 Novomoskovsk | 2021/05/30 06:15 | Alexander Zgirovsky v Inaki Cabrera Bello | 6-0,6-4 |
| ITF - M15 Novomoskovsk | 2021/05/25 08:45 | Gabriel Donev v Alexander Zgirovsky | 6-4,6-2 |
| ITF - M15 Novomoskovsk | 2021/05/24 12:00 | Olexiy Kolisnyk v Alexander Zgirovsky | 7-6,2-6,8-10 |
| ITF - M15 Novomoskovsk | 2021/05/23 08:00 | Egor Matvievici v Alexander Zgirovsky | 1-6,3-6 |
| ITF - M15 Petrohrad | 2021/04/12 08:30 | Daniil Glinka v Alexander Zgirovsky | 7-6,7-6 |
| ITF - M15 Petrohrad - kvalifikácia | 2021/04/11 11:00 | Leonid Sheyngezikht v Alexander Zgirovsky | 6-4,4-6,4-10 |
| ITF - M15 Novomoskovsk | 2021/05/31 06:15 | Gabriel Donev v Denis Parshutin | 6-0,6-4 |
| ITF - M15 Novomoskovsk | 2021/05/31 06:15 | Gabriel Donev v Roman Boychuk | 6-1,6-0 |
| ITF - M15 Novomoskovsk | 2021/05/26 09:05 | Ivan Nedelko v Gabriel Donev | 6-3,6-4 |
| ITF - M15 Novomoskovsk | 2021/05/25 08:45 | Gabriel Donev v Alexander Zgirovsky | 6-4,6-2 |
| ITF - M15 Novomoskovsk | 2021/05/24 12:00 | Gabriel Donev v Dzianis Zharyn | 7-6,6-7,10-6 |
| ITF - M15 Káhira | 2021/05/07 10:15 | Gabriel Donev v Oliver Crawford | 6-3,2-6,2-6 |
| ITF - M15 Káhira | 2021/05/06 08:00 | Gabriel Donev v Volodymyr Uzhylovskyi | 6-1,6-1 |
| ITF - M15 Káhira | 2021/05/04 09:45 | Gabriel Donev v Benedikt Emesz | 6-2,6-2 |