| UTR Pro Beograd | 2023/10/01 07:02 | Enrique Bogo v Nikola Mitrovic | 0-0 |
| ITF M25 Zlatibor | 2023/09/26 07:00 | Nikola Mitrovic v Lorenzo Ferri | 2-6,4-6 |
| ITF M15 Kursumlijska Banja | 2023/09/11 09:30 | Hernando J E Isnardi v Nikola Mitrovic | 6-2,6-4 |
| ITF M15 Pirot | 2023/09/04 08:30 | Nikola Mitrovic v Nikola Kolyachev | 3-6,0-6 |
| ITF M15 Kursumlijska Banja | 2023/08/27 12:00 | Nikola Mitrovic v Shendrit Deari | 0-6,5-7 |
| ITF M25 Osijek | 2023/08/07 07:30 | Gal Emersic Potocnik v Nikola Mitrovic | 6-2,6-0 |
| ITF M15 Novi Sad | 2023/07/31 16:05 | Lorenzo Gagliardo v Nikola Mitrovic | 6-1,6-2 |
| ITF M15 Novi Sad | 2023/07/31 07:00 | Nikola Mitrovic v Dennis Dragomirov | 6-4,4-6,11-9 |
| UTR Pro Beograd | 2023/10/05 06:00 | Tadija Radovanovic v Karlo Kajin | 6-7,6-4,6-2 |
| UTR Pro Beograd | 2023/10/03 14:10 | Karlo Kajin v Obrad Markovski | 6-4,3-6,4-6 |
| UTR Pro Beograd | 2023/10/02 13:41 | Karlo Kajin v Milan Drinic | 3-6,6-0,6-2 |
| UTR Pro Beograd | 2023/10/01 10:30 | Vuk Radjenovic v Karlo Kajin | 6-2,6-3 |
| UTR Pro Tennis Series Zadar | 2022/05/31 07:30 | Dmitrii Vasilev v Karlo Kajin | 3-6,7-6,2-0 |
| UTR Pro Tennis Series Zadar | 2022/05/30 06:00 | Karlo Kajin v Maximilian Homberg | 4-6,2-6 |
| UTR Pro Tennis Series Zadar | 2021/07/04 08:30 | Jerko Brkic v Karlo Kajin | 6-4,6-4 |
| UTR Pro Tennis Series Zadar | 2021/07/03 11:30 | Ihor Dudun v Karlo Kajin | 3-6,1-6 |