Stadium: Court 2 Round: 44 Ground: Clay
| ITF M15 Doboj | 2021/07/12 09:30 | Boris Butulija v Milos Vukovic | 6-3,6-3 |
| ITF M25 Belgrade | 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 Brcko | 2021/05/17 15:30 | Boris Butulija v Drazen Petrovic | 2-6,5-7 |
| ITF M15 Sibenik | 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 Doboj | 2021/07/12 09:30 | Danijal Muminovic v Sabit Suntic | 6-0,6-2 |
| ITF M15 Doboj | 2021/07/11 11:00 | Daniil Savelev v Danijal Muminovic | 1-6,6-7 |