Estadio: Court 7 Round: 25 Ground: Clay
| ITF M15 Novomoskovsk | 2021/05/26 09:05 | Ivan Nedelko v Gabriel Donev | 6-3,6-4 |
| ITF Turquía F33 | 2018/10/24 07:00 | Ivan Nedelko v Gabriel Donev | 7-5,1-6,6-4 |
| Challenger de Nur-Sultan | 2021/07/20 04:00 | Dostanbek Tashbulatov v Ivan Nedelko | 3-6,2-6 |
| ITF M25 Marburgo | 2021/07/07 14:35 | Ivan Nedelko v Nick Hardt | 5-7,7-6,4-6 |
| Challenger Almaty | 2021/06/06 06:45 | Benjamin Hassan v Ivan Nedelko | 6-2,6-2 |
| ITF M15 Novomoskovsk | 2021/06/03 12:15 | Ivan Nedelko v Aidan Mayo | 6-2,6-3 |
| ITF M15 Novomoskovsk | 2021/05/28 07:15 | Ivan Nedelko v Carlos Sanchez Jover | 4-6,3-6 |
| ITF M15 Novomoskovsk | 2021/05/27 12:00 | Ivan Nedelko v Nikita Alosha | 6-0,6-1 |
| ITF M15 Novomoskovsk | 2021/05/26 09:05 | Ivan Nedelko v Gabriel Donev | 6-3,6-4 |
| ITF 15 Antalya | 2021/05/20 07:30 | Luca Nardi v Ivan Nedelko | 7-5,6-2 |
| ITF M15 Novi Sad | 2021/07/26 09:00 | Gabriel Donev v Dusan Rajic | 6-2,6-2 |
| ITF M15 Novi Sad | 2021/07/25 12:00 | Gabriel Donev v Besir Durguti | 6-1,6-1 |
| ITF M15 Sofía | 2021/07/09 08:30 | Gabriel Donev v Alexander Weis | 6-4,3-6,6-7 |
| ITF M15 Sofía | 2021/07/08 11:40 | Simeon Terziev v Gabriel Donev | 1-6,6-4,0-6 |
| ITF M15 Sofía | 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 |