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 Kamen | 2023/06/28 10:50 | Matyas Cerny v Marcel Zielinski | 6-4,6-4 |
| ITF M15 Saarlouis | 2023/06/23 16:30 | Marcel Zielinski v Jeffrey Von Der Schulenburg | 6-7,6-2,1-6 |
| ITF M15 Saarlouis | 2023/06/22 09:30 | Marcel Zielinski v Tim Heger | 6-0,6-3 |
| ITF M15 Saarlouis | 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 |
| ITF M15 Telde | 2023/04/22 09:00 | Kai Lemstra v Marcel Zielinski | 2-6,4-6 |
| ITF M25 Bourg-en-Bresse | 2023/06/27 08:50 | David Pichler v Tiago Pires | 4-6,3-6 |
| Challenger Poznan | 2023/06/18 15:40 | Emilio Nava v David Pichler | 7-6,4-6,6-2 |
| Challenger Bratislava | 2023/06/11 10:00 | Daniel Dutra Da Silva v David Pichler | 2-6,6-2,6-2 |
| ITF M25 Kursumlijska Banja | 2023/06/08 06:55 | David Pichler v Sebastian Prechtel | 2-6,4-6 |
| ITF M25 Kursumlijska Banja | 2023/06/07 16:30 | David Pichler v Ognjen Milic | 6-1,6-3 |
| ITF M25 Rome | 2023/05/30 08:00 | David Pichler v Federico Iannaccone | 3-6,6-3,5-7 |
| ITF M15 Brcko | 2023/05/24 13:35 | Viacheslav Bielinskyi v David Pichler | 3-6,7-5,6-2 |
| Challenger Turin | 2023/05/14 10:00 | Andrea Gola v David Pichler | 6-4,6-4 |