Stadium: Court 1 Round: 27 Ground: Clay
| ITF M15 Antalya | 2019/02/18 07:00 | Alexander Weis v Gabriel Donev | 6-2,6-0 |
| ITF M15 Sofia | 2021/07/08 11:40 | Simeon Terziev v Gabriel Donev | 1-6,6-4,0-6 |
| ITF M15 Sofia | 2021/07/07 08:50 | Mattia Frinzi v Gabriel Donev | 5-7,2-6 |
| ITF M15 Novomoskovsk | 2021/06/03 11:45 | Alexander Zgirovsky v Gabriel Donev | 6-2,3-6,10-8 |
| 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 Sofia | 2021/07/08 10:15 | Timo Legout v Alexander Weis | 4-6,7-6,4-6 |
| ITF M15 Sofia | 2021/07/06 07:30 | Aziz Ouakaa v Alexander Weis | 0-6,3-6 |
| ITF M15 Bergamo | 2021/06/26 14:30 | Alexander Weis v Riccardo Balzerani | 3-6,4-6 |
| ITF M15 Bergamo | 2021/06/25 18:00 | Luca Nardi v Alexander Weis | 4-6,2-6 |
| ITF M15 Bergamo | 2021/06/23 11:05 | Alexander Weis v Rayane Roumane | 6-2,6-4 |
| ITF M15 Bergamo | 2021/06/22 13:35 | Alexander Weis v Federico Iannaccone | 6-2,6-4 |
| ITF M15 Bergamo | 2021/06/21 19:00 | Alexander Weis v Marcello Serafini | 7-5,6-4 |
| ITF M15 Genova | 2021/06/16 20:20 | Davide Galoppini v Alexander Weis | 6-4,6-3 |