Stadium: Court 1 Round: 44 Ground: Clay
| ITF - M25 Belehrad | 2021/06/27 09:00 | Boris Butulija v Luka Pavlovic | 4-6,3-6 |
| ITF - M15 Skopje | 2021/06/07 07:00 | Rrezart Cungu v Boris Butulija | 6-1,6-4 |
| ITF - M15 Skopje | 2021/06/01 09:30 | Petr Michnev v Boris Butulija | 6-3,6-2 |
| ITF - M15 Skopje | 2021/05/30 14:00 | Dian Nedev v Boris Butulija | 6-4,4-6,6-10 |
| ITF - M15 Brčko | 2021/05/17 15:30 | Boris Butulija v Drazen Petrovic | 2-6,5-7 |
| ITF - M15 Šibenik | 2021/04/19 12:15 | Ondrej Horak v Boris Butulija | 6-2,7-6 |
| Challenger - Belgrade | 2021/04/11 10:00 | Dmitry Popko v Boris Butulija | 6-2,6-1 |
| ITF - M15 - Antalya | 2021/03/21 07:00 | Boris Butulija v Bautista Vilicich | 6-4,5-7,9-11 |
| ITF - M15 Doboj | 2021/07/11 11:00 | Milos Vukovic v Luca Teboul | 6-0,6-3 |
| ITF - M25 Belehrad | 2021/06/27 07:00 | Tadija Radovanovic v Milos Vukovic | 6-7,6-4,10-8 |
| ITF - M15 Brčko | 2021/05/18 07:00 | Milos Vukovic v Dusan Obradovic | 4-6,0-6 |
| ITF - M15 Brčko | 2021/05/16 11:00 | Luca Teboul v Milos Vukovic | 1-6,1-6 |
| ITF - M15 Prijedor | 2021/05/10 09:15 | Milos Vukovic v Stefan Ivic | 6-7,4-6 |
| ITF - M15 Prijedor | 2021/05/09 07:00 | Joris Hoogland v Milos Vukovic | 2-6,2-6 |
| ITF - M15 Opatija | 2021/03/21 13:00 | Milos Vukovic v Stefan Loncar | 2-6,6-4,7-10 |
| ITF - M15 Rovinj | 2021/03/15 09:30 | Davide Galoppini v Milos Vukovic | 6-2,6-0 |