Stadium: Court 1 Round: 25 Ground: Clay
| ITF M15 Eindhoven | 2022/08/15 11:00 | Marcel Zielinski v John Sperle | 6-2,7-6 |
| 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 M15 Telde | 2023/04/21 09:00 | Marcel Zielinski v Martin Cuevas | 6-4,6-1 |
| ITF M15 Telde | 2023/04/20 12:30 | Jorge Martinez Martinez v Marcel Zielinski | 3-6,2-6 |
| ITF M15 Telde | 2023/04/18 08:00 | Marcel Zielinski v Benjamin Winter Lopez | 3-6,6-2,6-4 |
| ITF M15 Telde | 2023/04/17 08:00 | Marcel Zielinski v Ian Luca Cervantes Tomas | 6-4,6-2 |
| ITF M15 Telde | 2023/04/16 08:00 | Marcel Zielinski v Iker Urribarrens | 7-6,6-2 |
| ITF M15 Telde | 2023/04/14 09:00 | Marcel Zielinski v Vilius Gaubas | 4-6,2-6 |
| ITF M15 Meerbusch | 2023/04/25 08:00 | Philipp Pavlenko v John Sperle | 2-6,0-6 |
| ITF M15 Meerbusch | 2023/04/24 10:00 | Dawid Wisniewski v John Sperle | 0-6,2-6 |
| ITF M15 Meerbusch | 2023/04/24 08:00 | Torben Steinorth v John Sperle | 3-6,3-6 |
| ITF M15 Antalya | 2023/04/06 09:50 | Dragos Nicolae Madaras v John Sperle | 6-3,6-3 |
| ITF M15 Antalya | 2023/04/05 10:25 | Tom Gentzsch v John Sperle | 4-6,2-6 |
| ITF M15 Antalya | 2023/04/03 12:40 | Tom Schonenberg v John Sperle | 3-6,6-4,3-10 |
| ITF M15 Antalya | 2023/04/02 07:00 | Luca Hesselmann v John Sperle | 0-6,2-6 |
| ITF M15 Antalya | 2023/03/29 11:20 | John Sperle v Nicolas Zanellato | 6-7,3-6 |