Stadium: Court 4 Round: 62 Ground: Clay
| ITF M15 Novi Sad | 2021/07/26 07:30 | Tadeas Paroulek 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 | Peter Goldsteiner v Roko Horvat | 7-6,6-4 |
| ITF M25 Velenje | 2021/07/04 07:30 | Pietro Schiavetti 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 |
| UTR Pro Tennis Series Zadar | 2021/07/01 08:00 | Roko Horvat v Anatoliy Petrenko | 6-2,6-1 |
| UTR Pro Tennis Series Zadar | 2021/06/30 12:30 | Roko Horvat v Yaraslav Shyla | 5-7,6-3,3-5 |
| ITF M15 Novi Sad | 2021/07/25 10:45 | Tomislav Jotovski v Luka Petrovic | 7-6,6-2 |
| ITF M25 Belgrade | 2021/06/30 12:45 | Luka Petrovic v Alexandar Lazarov | 0-6,2-6 |
| ITF M15 Sarajevo | 2021/06/04 09:00 | Joao Lucas Reis da Silva v Luka Petrovic | 6-3,6-3 |
| ITF M15 Sarajevo | 2021/06/03 10:50 | Luka Petrovic v Din Karahodza | 6-1,7-5 |
| ITF M15 Sarajevo | 2021/06/02 14:05 | Luka Petrovic v Aleksandar Mihailovic | 6-4,6-0 |
| ITF M15 Sarajevo | 2021/06/01 09:00 | Petar Jovanovic v Luka Petrovic | 3-6,7-5,9-11 |
| ITF M15 Sarajevo | 2021/05/31 12:00 | Max Van Wijk v Luka Petrovic | 3-6,2-6 |
| ITF M15 Brcko | 2021/05/17 15:30 | Lazar Vojinovic v Luka Petrovic | 6-3,6-4 |