Stadium: Court 6 Round: 25 Ground: Hardcourt outdoor
| ITF M15 Sofia | 2023/07/06 08:10 | Matej Dodig v Marcel Zielinski | 6-4,6-2 |
| ITF M15 Sofia | 2023/07/05 09:45 | Alessandro Ingarao v Marcel Zielinski | 0-6,3-6 |
| 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 M25 The Hague | 2023/07/05 14:30 | Simon Beaupain v Jakub Wojcik | 5-7,2-6 |
| ITF M15 Duffel | 2023/06/15 08:00 | John Sperle v Simon Beaupain | 7-6,4-6,7-6 |
| ITF M15 Bucharest | 2023/05/25 08:00 | Simon Beaupain v Petr Nesterov | 2-6,2-6 |
| ITF M15 Bucharest | 2023/05/24 09:40 | Simon Beaupain v Darius Florin Pop | 6-0,4-6,6-1 |
| ITF M15 Antalya | 2023/05/12 11:00 | Simon Beaupain v Peter Benjamin Privara | 6-4,3-6,1-6 |
| ITF M15 Antalya | 2023/05/11 09:25 | Simon Beaupain v Mikhail Gorokhov | 6-1,6-2 |
| ITF M15 Antalya | 2023/05/10 09:50 | Simon Beaupain v Caspar Schuetze | 4-6,6-4,6-4 |
| UTR Pro Hilversum | 2023/05/05 16:00 | Jakub Wojcik v Simon Beaupain | 6-3,6-1 |