| UTR Pro Zadar | 2023/10/20 09:02 | Tim Heger v Christos Keisidis | 4-6,3-5 |
| UTR Pro Zadar | 2023/10/19 06:00 | Josh Roe Flannelly v Christos Keisidis | 0-6,0-2 |
| UTR Pro Zadar | 2023/10/17 07:30 | Duje Kekez v Christos Keisidis | 6-3,6-3 |
| UTR Pro Zadar | 2023/10/16 10:15 | Christos Keisidis v Hugo Coquelin | 6-4,6-2 |
| UTR Pro Beograd | 2023/10/14 07:30 | Karlo Kajin v Christos Keisidis | 4-6,6-3,5-1 |
| 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 Zadar | 2023/10/20 09:49 | Yanais Laurent v Josip Simundza | 6-2,6-3 |
| UTR Pro Zadar | 2023/10/19 10:09 | Enrique Bogo v Josip Simundza | 3-6,3-5 |
| UTR Pro Zadar | 2023/10/18 10:12 | Jerko Brkic v Josip Simundza | 3-6,6-3,3-6 |
| ITF M15 Bad Waltersdorf | 2023/10/02 08:00 | Jan Kupcic v Josip Simundza | 6-3,6-2 |
| ITF M15 Bad Waltersdorf | 2023/10/01 09:00 | Leon Benedict v Josip Simundza | 2-6,2-6 |
| ITF M25 Madrid | 2023/09/10 15:00 | Josip Simundza v Rodrigo Mora Clement | 6-2,6-4 |
| ITF M15 Budapest | 2023/09/06 10:00 | Josip Simundza v Gabriel Decamps | 1-6,4-6 |
| ITF M15 Budapest | 2023/09/04 10:00 | Josip Simundza v Kevin Humpfner | 2-6,3-6 |