Stadium: Court 1 Round: 25 Ground: Hardcourt outdoor
| ITF - Sozopol M15 | 2021/10/05 09:00 | Dragomir Draganov v George Tsivadze | 3-6,2-6 |
| ITF - Sozopol M15 | 2021/09/15 09:30 | Simon A Ivanov v Dragomir Draganov | 6-2,6-4 |
| ITF - Sozopol M15 | 2021/10/09 07:00 | Alexander Donski v Kai Wehnelt | 6-4,3-6,6-7 |
| ITF - Sozopol M15 | 2021/10/08 08:35 | Tim Handel v Alexander Donski | 3-6,6-3,2-6 |
| ITF - Sozopol M15 | 2021/10/05 15:15 | Dragos Constantin Ignat v Alexander Donski | 1-6,2-6 |
| ATP Sofia | 2021/09/27 09:00 | Andreas Seppi v Alexander Donski | 6-3,6-2 |
| ATP Sofia | 2021/09/26 09:00 | Alexander Donski v Jurij Rodionov | 2-6,6-1,7-6 |
| ITF - Plaisir M25 | 2021/09/16 09:55 | Robin Bertrand v Alexander Donski | 3-6,3-6 |
| ITF - Plaisir M25 | 2021/09/14 08:00 | Alexander Donski v Quentin Robert | 7-5,1-6,6-2 |
| ITF - Ricany M25 | 2021/09/02 08:00 | Alexander Donski v Ryan Peniston | 2-6,4-6 |