Stadium: Court 3 Round: 44 Ground: Clay
| ITF - M15 Kottingbrunn | 2023/08/13 12:00 | Maks Meh v Martin Zeljenka | 6-2,6-3 |
| ITF - M25 Osijek | 2023/08/06 10:00 | Martin Zeljenka v Marcell Bartakovics | 3-6,3-6 |
| ITF - M25 Telfs | 2023/07/16 07:00 | Stepan Pecak v Martin Zeljenka | 6-4,1-6,10-2 |
| ITF - M15 Kursumlijska Banja | 2023/06/19 09:25 | Marko Stakusic v Martin Zeljenka | 6-3,6-3 |
| ITF - M15 Kursumlijska Banja | 2023/06/18 07:00 | Martin Zeljenka v Dmitrii Vasilev | 6-3,6-4 |
| ITF - M15 Nyiregyhaza | 2023/06/05 09:30 | Peter Nad v Martin Zeljenka | 7-5,6-3 |
| ITF - M15 Nyiregyhaza | 2023/06/04 14:30 | Gabor Hornung v Martin Zeljenka | 6-7,7-5,5-10 |
| ITF - M15 Osijek | 2023/05/02 10:30 | Emanuele Mazzeschi v Martin Zeljenka | 6-3,6-3 |
| ITF - M25 Poznan | 2023/08/20 13:30 | Adam Bajurko v James Markiewicz | 6-3,7-5 |