Stadium: Court 7 Round: 25 Ground: Clay
| ITF M15 Novi Sad | 2021/07/28 09:35 | Spec, Matic v Mariano Navone | 1-6,6-4,1-6 |
| ITF M15 Novi Sad | 2021/07/27 07:30 | Spec, Matic v Koray Kirci | 6-3,7-5 |
| ITF M15 Novi Sad | 2021/07/25 12:00 | Spec, Matic v Daniil Savelev | 6-1,6-3 |
| ITF - M15 Prijedor | 2021/05/09 12:30 | Spec, Matic v Luka Miklavcic | 3-6,6-3,8-10 |
| ITF M15 St Petersburg | 2021/04/17 09:45 | Spec, Matic v Yanki Erel | 6-7,2-6 |
| ITF M15 St Petersburg | 2021/04/16 07:55 | Spec, Matic v Alexey Zakharov | 6-2,6-4 |
| ITF M15 St Petersburg | 2021/04/15 07:00 | Jakub Paul v Spec, Matic | 6-7,6-4,3-6 |
| ITF M15 St Petersburg | 2021/04/14 09:15 | Spec, Matic v Alafia Ayeni | 6-3,6-4 |
| ITF M15 Novi Sad | 2021/08/03 08:00 | Alex Knaff v Roko Horvat | 4-6,6-1,6-10 |
| ITF M15 Novi Sad | 2021/08/02 08:00 | Suntic, Sabit v Roko Horvat | 1-6,1-6 |
| ITF M15 Novi Sad | 2021/07/26 07:30 | Paroulek, Tadeas v Roko Horvat | 6-4,7-5 |
| ITF M15 Novi Sad | 2021/07/25 09:30 | Roko Horvat v Lazar Vojinovic | 6-2,3-6,10-3 |
| ITF - M15 Doboj | 2021/07/11 13:45 | Roko Horvat v Nicolas Bruna | 6-1,2-6,8-10 |
| ITF M25 Velenje | 2021/07/05 16:20 | Goldsteiner, Peter v Roko Horvat | 7-6,6-4 |
| ITF M25 Velenje | 2021/07/04 07:30 | Schiavetti, Pietro v Roko Horvat | 6-2,3-6,6-10 |
| UTR Pro Tennis Series Zadar | 2021/07/03 07:00 | Matija Pecotic v Roko Horvat | 6-3,5-4 |