| ITF M15 Mungia-Laukariz | 2025/06/16 14:30 | Marcel Zielinski v Nacho Serra Sanchez | 6-4,7-6 |
| UTR Pro Ahaus | 2025/06/08 10:25 | Marcel Zielinski v Benjamin Dhoe | 6-1,6-2 |
| UTR Pro Ahaus | 2025/06/07 08:25 | Marcel Zielinski v Tim Hammes | 6-4,6-2 |
| UTR Pro Ahaus | 2025/06/06 09:35 | Marcel Zielinski v Jimmy Yang | 6-2,6-3 |
| UTR Pro Ahaus | 2025/06/04 13:15 | Marcel Zielinski v Vitek Horak | 6-4,1-6,6-3 |
| UTR Pro Ahaus | 2025/06/03 08:50 | Marcel Zielinski v Finn Hopfe | 6-4,6-2 |
| UTR Pro Ahaus | 2025/06/02 13:45 | Cornelius Alexander Shalmi v Marcel Zielinski | 5-7,3-6 |
| ITF M15 Antalya | 2025/04/23 09:00 | Marcel Zielinski v Mert Naci Turker | 4-6,2-6 |
| ITF M15 Nyiregyhaza | 2025/06/17 08:00 | Neil Oberleitner v Jeremy Gschwendtner | 6-4,6-4 |
| ITF M15 Nyiregyhaza | 2025/06/15 09:00 | Neil Oberleitner v Peter Fajta | 3-6,4-6 |
| ITF M15 Nyiregyhaza | 2025/06/14 10:00 | Neil Oberleitner v Jeremy Gschwendtner | 6-4,6-2 |
| ITF M15 Nyiregyhaza | 2025/06/13 09:00 | Neil Oberleitner v Mate Valkusz | 6-3,6-1 |
| ITF M15 Nyiregyhaza | 2025/06/12 08:00 | Neil Oberleitner v Rethin Pranav Senthil Kumar | 6-2,6-2 |
| ITF M15 Nyiregyhaza | 2025/06/10 08:00 | Neil Oberleitner v Oscar Jose Gutierrez | 6-3,6-1 |
| Challenger Skopje | 2025/05/20 09:40 | Neil Oberleitner v Oriol Roca Batalla | 7-6,3-6,4-6 |
| Challenger Skopje | 2025/05/19 13:25 | Andrew Paulson v Neil Oberleitner | 4-6,3-6 |