Stadium: Court 3 Round: 62 Ground: Clay
| 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 |
| 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 |