Ground: Clay
| ITF M15 Novi Sad | 2023/07/24 11:10 | Novak Novakovic v Aleksandar Mihailovic | 7-6,6-1 |
| ITF M15 Novi Sad | 2023/07/23 13:00 | Aleksandar Mihailovic v Andrej Krajcik | 6-0,0-6,10-7 |
| ITF M15 Kursumlijska Banja | 2023/06/19 10:55 | Aleksandar Mihailovic v Shendrit Deari | 6-4,4-6,2-10 |
| ITF M15 Kursumlijska Banja | 2023/06/18 15:00 | Mwendwa Mbithi v Aleksandar Mihailovic | 4-6,4-6 |
| ITF M25 Kursumlijska Banja | 2023/06/05 15:40 | Aleksandar Mihailovic v Simone Agostini | 5-7,6-7 |
| ITF M15 Kursumlijska Banja | 2023/05/22 08:40 | Aleksandar Mihailovic v Lorenzo Carboni | 4-6,2-6 |
| ITF M25 Kursumlijska Banja | 2023/05/08 07:00 | Mikalai Haliak v Aleksandar Mihailovic | 6-4,6-2 |
| ITF M15 Kursumlijska Banja | 2023/05/01 09:45 | Aleksandar Mihailovic v Chukang Wang | 5-7,2-6 |
| 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 |
| UTR Pro Tennis Series Zadar | 2021/07/01 11:00 | Karlo Kajin v Matija Pecotic | 1-6,2-5 |
| UTR Pro Tennis Series Zadar | 2021/06/30 09:30 | Karlo Kajin v Alexander Kiefer | 3-6,1-6 |
| UTR Pro Tennis Series Zadar | 2021/06/29 12:30 | Karlo Kajin v Aleksei Khomich | 6-4,3-6,2-6 |
| UTR ProTennis Series Zadar | 2021/06/28 08:00 | Karlo Kajin v Ryan Goetz | 1-6,1-5 |