| UTR Pro Beograd | 2023/10/13 06:00 | Egor Gorin v Karlo Kajin | 0-6,2-6 |
| UTR Pro Beograd | 2023/10/11 06:00 | Janos Fekete v Karlo Kajin | 6-4,6-4 |
| UTR Pro Beograd | 2023/10/10 09:00 | Yanais Laurent v Karlo Kajin | 6-2,6-3 |
| UTR Pro Beograd | 2023/10/09 07:30 | Nikola Mitrovic v Karlo Kajin | 4-6,3-6 |
| 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 Beograd | 2023/10/12 06:00 | Christos Keisidis v Niksa Arsic | 6-2,6-2 |
| UTR Pro Beograd | 2023/10/11 07:30 | Stefan Popovic v Christos Keisidis | 6-3,6-2 |
| UTR Pro Beograd | 2023/10/10 12:40 | Tadija Radovanovic v Christos Keisidis | 4-6,3-6 |
| UTR Pro Beograd | 2023/10/08 09:00 | Christos Keisidis v Domagoj Biljesko | 4-6,0-6 |
| UTR Pro Beograd | 2023/10/04 08:44 | Christos Keisidis v Ilya Snitari | 2-6,0-6 |
| UTR Pro Beograd | 2023/10/03 07:30 | Christos Keisidis v Drazen Petrovic | 2-6,5-7 |
| UTR Pro Beograd | 2023/10/02 06:00 | Christos Keisidis v Zoran Ludoski | 4-6,6-7 |
| UTR Pro Olomouc | 2023/09/17 07:30 | Mikolaj Lis v Christos Keisidis | 1-6,3-6 |