| 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 Antalya | 2025/04/17 08:30 | Marcel Zielinski v Ryan Nijboer | 4-6,4-6 |
| ITF M15 Antalya | 2025/04/16 08:30 | Maxwell Exsted v Marcel Zielinski | 5-7,4-6 |
| ITF M15 Alaminos | 2025/03/13 07:30 | Pablo Masjuan Ginel v Marcel Zielinski | 7-6,6-4 |
| ITF M15 Alaminos | 2025/03/12 11:00 | Marcel Zielinski v Adrian Oetzbach | 6-3,4-6,7-5 |
| 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 |
| Challenger Skopje | 2025/05/18 11:35 | Berk Bugarikj v Neil Oberleitner | 6-3,3-6,4-6 |
| Challenger Zagreb | 2025/05/13 10:50 | Marco Trungelliti v Neil Oberleitner | 6-2,2-6,6-4 |
| Challenger Zagreb | 2025/05/12 08:00 | Luka Pavlovic v Neil Oberleitner | 6-7,6-7 |
| Challenger Zagreb | 2025/05/11 08:00 | Nikita Mashtakov v Neil Oberleitner | 4-6,6-7 |
| Challenger Mauthausen | 2025/05/02 10:55 | Cristian Garin v Neil Oberleitner | 6-2,6-7,6-4 |
| Challenger Mauthausen | 2025/05/01 09:00 | Joel Schwaerzler v Neil Oberleitner | 4-6,6-7 |