Stadium: KARISMA Court (1) Round: 25 Ground: Clay
| ITF M15 Novi Sad | 2021/07/26 09:00 | Gabriel Donev v Dusan Rajic | 6-2,6-2 |
| ITF M15 Ulcinj | 2021/09/03 08:55 | Gabriel Donev v Ignacio Carou | 4-6,3-6 |
| ITF M15 Ulcinj | 2021/09/02 08:30 | Gorazd Srbljak v Gabriel Donev | 1-6,6-7 |
| ITF M15 Telavi | 2021/08/04 08:45 | Evgeny Philippov v Gabriel Donev | 2-6,3-6 |
| ITF M15 Telavi | 2021/08/03 09:45 | Martin Borisiouk v Gabriel Donev | 3-6,2-6 |
| ITF M15 Novi Sad | 2021/07/30 08:00 | Gabriel Donev v Juan Pablo Paz | 4-6,5-7 |
| ITF M15 Novi Sad | 2021/07/29 09:25 | Gabriel Donev v Gorazd Srbljak | 6-2,6-4 |
| ITF M15 Novi Sad | 2021/07/28 11:10 | Ivan Nedelko v Gabriel Donev | 4-6,1-6 |
| ITF M15 Novi Sad | 2021/07/26 09:00 | Gabriel Donev v Dusan Rajic | 6-2,6-2 |
| ITF M15 Ulcinj | 2021/09/06 13:00 | Matthew Dellavedova v Dusan Rajic | 2-6,5-7 |
| ITF M15 Ulcinj | 2021/09/06 07:30 | Dusan Rajic v Igor Smilansky | 6-4,6-4 |
| ITF M15 Ulcinj | 2021/09/05 07:30 | Ammar Elamin v Dusan Rajic | 4-6,4-6 |
| ITF M15 Ulcinj | 2021/09/01 11:25 | Matthew Dellavedova v Dusan Rajic | 6-2,6-3 |
| ITF M15 Ulcinj | 2021/08/30 11:30 | Dusan Obradovic v Dusan Rajic | 4-6,6-3,2-10 |
| ITF M15 Ulcinj | 2021/08/30 07:30 | Lautaro Agustin Falabella v Dusan Rajic | 6-3,3-6,2-10 |
| ITF M15 Novi Sad | 2021/08/02 11:00 | Dusan Rajic v Lukas Palovic | 4-6,1-6 |
| ITF M15 Novi Sad | 2021/07/26 09:00 | Gabriel Donev v Dusan Rajic | 6-2,6-2 |