Stadium: Court 7 Round: 25 Ground: Clay
| ITF M15 Novomoskovsk | 2021/05/26 09:05 | Nedelko, Ivan v Gabriel Donev | 6-3,6-4 |
| ITF Turkey F33 | 2018/10/24 07:00 | Nedelko, Ivan v Gabriel Donev | 7-5,1-6,6-4 |
| Nur Sultan, Kazakhstan | 2021/07/20 04:00 | Tashbulatov, Dostanbek v Nedelko, Ivan | 3-6,2-6 |
| ITF M25 Marburg | 2021/07/07 14:35 | Nedelko, Ivan v Nick Hardt | 5-7,7-6,4-6 |
| Challenger Almaty | 2021/06/06 06:45 | Benjamin Hassan v Nedelko, Ivan | 6-2,6-2 |
| ITF M15 Novomoskovsk | 2021/06/03 12:15 | Nedelko, Ivan v Aidan Mayo | 6-2,6-3 |
| ITF M15 Novomoskovsk | 2021/05/28 07:15 | Nedelko, Ivan v Carlos Sanchez Jover | 4-6,3-6 |
| ITF M15 Novomoskovsk | 2021/05/27 12:00 | Nedelko, Ivan v Alosha Ushakov, Nikita | 6-0,6-1 |
| ITF M15 Novomoskovsk | 2021/05/26 09:05 | Nedelko, Ivan v Gabriel Donev | 6-3,6-4 |
| ITF - M15 Antalya | 2021/05/20 07:30 | Luca Nardi v Nedelko, Ivan | 7-5,6-2 |
| ITF M15 Novi Sad | 2021/07/26 09:00 | Gabriel Donev v Rajic, Dusan | 6-2,6-2 |
| ITF M15 Novi Sad | 2021/07/25 12:00 | Gabriel Donev v Durguti, Besir | 6-1,6-1 |
| ITF M15 Sofia | 2021/07/09 08:30 | Gabriel Donev v Alexander Weis | 6-4,3-6,6-7 |
| ITF M15 Sofia | 2021/07/08 11:40 | Terziev, Simeon v Gabriel Donev | 1-6,6-4,0-6 |
| ITF M15 Sofia | 2021/07/07 08:50 | Frinzi, Mattia 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 Parshutin, Denis | 6-0,6-4 |
| ITF M15 Novomoskovsk | 2021/05/31 06:15 | Gabriel Donev v Boychuk, Roman | 6-1,6-0 |