Stadium: Court 4 Round: 26 Ground: Clay
| ITF - M15 Celje | 2023/06/30 08:00 | Matej Dodig v Bor Artnak | 6-4,6-7,0-6 |
| ITF - M15 Celje | 2023/06/28 12:55 | Matej Dodig v Dimic, Matic | 6-3,6-4 |
| Sarajevo, Singles Main, M-ITF-BIH-05A | 2023/06/10 07:45 | Luka Mikrut v Matej Dodig | 5-7,7-6,7-5 |
| Sarajevo, Singles Main, M-ITF-BIH-05A | 2023/06/09 08:55 | Matej Dodig v Dusan Obradovic | 6-3,6-4 |
| Sarajevo, Singles Main, M-ITF-BIH-05A | 2023/06/08 10:05 | Felix Gill v Matej Dodig | 3-6,3-6 |
| Sarajevo, Singles Main, M-ITF-BIH-05A | 2023/06/06 11:00 | Kekez, Duje v Matej Dodig | 2-6,4-6 |
| ITF - M15 Doboj | 2023/05/12 10:00 | Matej Dodig v Martinez, Mirko | 6-2,1-6,4-6 |
| ITF - M15 Doboj | 2023/05/09 10:30 | Tarik Bajrovic v Matej Dodig | 0-6,1-6 |
| ITF M15 Sofia | 2023/07/05 09:45 | Alessandro Ingarao v Marcel Zielinski | 0-6,3-6 |
| ITF M15 Kamen | 2023/06/28 10:50 | Matyas Cerny v Marcel Zielinski | 6-4,6-4 |
| Saarlouis, Singles Qualifying M-ITF-GER-07A | 2023/06/23 16:30 | Marcel Zielinski v von Der Schulenburg, Jeffrey | 6-7,6-2,1-6 |
| Saarlouis, Singles Qualifying M-ITF-GER-07A | 2023/06/22 09:30 | Marcel Zielinski v Heger, Tim | 6-0,6-3 |
| Saarlouis, Singles Qualifying M-ITF-GER-07A | 2023/06/21 09:25 | Mika Brunold v Marcel Zielinski | 3-6,1-6 |
| ITF - M15 Meerbusch | 2023/04/27 08:55 | Marcel Zielinski v Liam Gavrielides | 6-7,1-6 |
| ITF - M15 Meerbusch | 2023/04/26 09:00 | Marcel Zielinski v John Sperle | 7-6,7-5 |
| ITF - M15 Telde | 2023/04/23 09:00 | Marcel Zielinski v Alejandro Manzanera Pertusa | 4-6,6-7 |