Stadium: Court 1 Round: 27 Ground: Clay
| ITF M15 Eindhoven | 2022/08/18 11:00 | David Pichler v Marcel Zielinski | 6-4,6-1 |
| ITF M15 Kamen | 2022/06/21 14:00 | Marcel Zielinski v David Pichler | 3-6,6-7 |
| ITF M15 Bad Waltersdorf | 2023/10/05 11:45 | Matthias Ujvary v Marcel Zielinski | 4-6,7-6,2-6 |
| ITF M15 Bad Waltersdorf | 2023/10/04 12:20 | Patrick Zahraj v Marcel Zielinski | 7-6,3-6,0-6 |
| ITF M15 Buschhausen | 2023/09/14 14:30 | Jonas Forejtek v Marcel Zielinski | 6-3,6-2 |
| ITF M15 Buschhausen | 2023/09/13 10:45 | Marcel Zielinski v Christian Hansen | 7-5,6-1 |
| ITF M15 Koszalin | 2023/09/09 11:00 | Marcel Zielinski v Dominik Kellovsky | 3-6,3-6 |
| ITF M15 Koszalin | 2023/09/08 10:00 | Marcel Zielinski v Patrick Zahraj | 6-3,7-5 |
| ITF M15 Koszalin | 2023/09/07 12:00 | Marcel Zielinski v Fryderyk Lechno-Wasiutynski | 6-7,7-5,6-4 |
| ITF M15 Koszalin | 2023/09/06 15:00 | Marcel Zielinski v Bruno Kokot | 6-2,6-2 |
| ITF M15 Bad Waltersdorf | 2023/10/05 09:15 | Maik Steiner v David Pichler | 4-6,0-6 |
| ITF M15 Bad Waltersdorf | 2023/10/04 10:05 | Radovan Michalik v David Pichler | 2-6,1-6 |
| ITF M25 Zlatibor | 2023/09/29 11:30 | Sebastian Gima v David Pichler | 7-6,6-3 |
| ITF M25 Zlatibor | 2023/09/29 07:30 | David Pichler v Andrej Nedic | 3-6,6-4,6-4 |
| ITF M25 Zlatibor | 2023/09/28 10:30 | David Pichler v Petr Bar Biryukov | 6-1,7-6 |
| Challenger Bad Waltersdorf | 2023/09/17 08:00 | Henri Squire v David Pichler | 6-7,6-3,6-4 |
| Challenger Tulln | 2023/09/04 10:50 | Daniel Masur v David Pichler | 6-2,6-7,6-4 |
| Challenger Tulln | 2023/09/03 11:40 | David Pichler v Kirill Kivattsev | 7-6,4-6,6-3 |