Stadium: Court 3 Round: 25 Ground: Clay
| ITF Turkey F33 | 2018/10/24 07:00 | Nedelko, Ivan v Gabriel Donev | 7-5,1-6,6-4 |
| ITF - M15 Antalya | 2021/05/20 07:30 | Luca Nardi v Nedelko, Ivan | 7-5,6-2 |
| ITF - M15 Antalya | 2021/05/19 10:00 | Paul Woerner v Nedelko, Ivan | 7-6,5-7,4-6 |
| ITF - M15 Antalya | 2021/05/13 06:50 | Naoki Nakagawa v Nedelko, Ivan | 4-6,7-6,6-3 |
| ITF - M15 Antalya | 2021/05/11 07:00 | Umut Akkoyun v Nedelko, Ivan | 2-6,0-6 |
| ITF M15 St Petersburg | 2021/04/11 09:00 | Nedelko, Ivan v Illya Beloborodko | 2-6,7-5,6-4 |
| ITF M15 St Petersburg | 2021/04/10 08:00 | Cozbinov, Alexander v Nedelko, Ivan | 6-2,4-6,3-6 |
| ITF M15 St Petersburg | 2021/04/09 08:00 | Nedelko, Ivan v Sarp Agabigun | 6-1,6-4 |
| ITF M15 St Petersburg | 2021/04/08 07:00 | Nedelko, Ivan v Simon Freund | 6-2,6-4 |
| 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 Zharyn, Dzianis | 7-6,6-7,10-6 |
| ITF M15 Cairo | 2021/05/07 10:15 | Gabriel Donev v Oliver Crawford | 6-3,2-6,2-6 |
| ITF M15 Cairo | 2021/05/06 08:00 | Gabriel Donev v Uzhylovsky, Vladimir | 6-1,6-1 |
| ITF M15 Cairo | 2021/05/04 09:45 | Gabriel Donev v Emesz, Benedikt | 6-2,6-2 |
| ITF M15 Cairo | 2021/05/03 08:00 | Gabriel Donev v Santiago De La Fuente | 7-5,1-6,17-15 |
| ITF M15 Cairo | 2021/04/28 09:35 | Carlos Sanchez Jover v Gabriel Donev | 6-1,6-2 |
| UTR Pro Tennis Series Pazardzhik | 2021/04/10 10:30 | Gergely Madarasz v Gabriel Donev | 4-6,6-3,6-0 |