| UTR Pro Tennis Series Zadar | 2021/07/02 08:00 | Ihor Dudun v Vito Tonejc | 4-6,4-6 |
| UTR Pro Tennis Series Zadar | 2021/06/30 12:00 | Ihor Dudun v Bozo Barun | 1-6,1-5 |
| UTR Pro Tennis Series Zadar | 2021/06/29 08:00 | Ihor Dudun v Deni Zmak | 3-6,2-6 |
| UTR Pro Tennis Series Zadar | 2021/06/28 09:30 | Arthus De La Bassetiere v Ihor Dudun | 3-6,6-1,6-1 |
| UTR Pro Tennis Series Barcelona | 2021/06/25 11:00 | Xavier Gabarro v Ihor Dudun | 6-2,5-1 |
| UTR Pro Tennis Series Barcelona | 2021/06/23 09:30 | Kuzey Cekirge v Ihor Dudun | 6-0,5-1 |
| UTR Pro Tennis Series Barcelona | 2021/06/22 12:30 | Tristan Meraut v Ihor Dudun | 6-4,3-5 |
| UTR Pro Tennis Series Barcelona | 2021/06/21 14:00 | Ihor Dudun v David Perez Sanz | 1-6,6-3,6-4 |
| 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 |
| ITF Croatia F3 | 2018/03/19 12:30 | Tommaso Gabrieli v Karlo Kajin | 7-6,6-4 |
| ITF Croatia F3 | 2018/03/18 10:30 | Marco De Rosa v Karlo Kajin | 6-7,6-2,2-6 |
| ITF Croatia F2 | 2018/03/12 08:00 | Andres Gabriel Ciurletti v Karlo Kajin | 6-3,6-3 |
| ITF Croatia F2 | 2018/03/10 09:00 | Karlo Kajin v Justin Schlageter | 3-6,6-2,6-4 |