Stadium: Court Center Round: 25 Ground: Hardcourt outdoor
| ITF M15 Budapest | 2023/09/04 10:00 | Josip Simundza v Kevin Humpfner | 2-6,3-6 |
| ITF M15 Budapest | 2023/09/03 09:30 | Josip Simundza v Gregor Hausberger | 6-1,5-7,12-10 |
| ITF M25 Osijek | 2023/08/08 11:15 | Dusan Obradovic v Josip Simundza | 6-3,6-4 |
| ITF M15 Celje | 2023/06/27 08:45 | Josip Simundza v Maurus Malgiaritta | 2-6,6-7 |
| ITF M15 Celje | 2023/06/26 09:30 | Michal Novansky v Josip Simundza | 2-6,4-6 |
| ITF M15 Store | 2023/06/20 08:00 | Filip Jeff Planinsek v Josip Simundza | 3-6,6-3,10-8 |
| ITF M15 Store | 2023/06/19 12:50 | Edison Ambarzumjan v Josip Simundza | 4-6,3-6 |
| ITF M15 Litija | 2023/06/15 11:50 | Sebastian Prechtel v Josip Simundza | 7-5,6-1 |
| ITF M15 Budapest | 2023/09/03 08:00 | Gabriel Decamps v Giles Hussey | 6-2,3-6,3-6 |
| ITF M15 Budapest | 2023/09/02 10:00 | Matyas Fuele v Gabriel Decamps | 3-6,3-6 |
| ITF M15 Budapest | 2023/08/31 10:25 | Gabriel Decamps v Max Wiskandt | 6-2,6-3 |
| ITF M15 Budapest | 2023/08/29 17:06 | Gabriel Decamps v Amit Vales | 0-6,6-4,7-5 |
| Challenger Barletta | 2023/04/02 08:00 | Jakub Paul v Gabriel Decamps | 6-1,6-2 |
| Challenger Sanremo | 2023/03/26 10:40 | Andrea Vavassori v Gabriel Decamps | 6-0,6-1 |
| Challenger Puerto Vallarta | 2023/03/06 21:00 | Gabriel Decamps v Christian Langmo | 4-6,6-1,3-6 |
| Challenger Puerto Vallarta | 2023/03/05 19:55 | Gabriel Decamps v Shinji Hazawa | 6-4,6-3 |