Stadium: Court 1 Round: 26 Ground: Clay
| Koszalin, Singles Qualifying M-ITF-POL-02A | 2023/09/06 15:00 | Zielinski, Marcel v Bruno Kokot | 6-2,6-2 |
| ITF M15 Szczawno | 2023/08/31 14:35 | 자라이, 패트릭 v Zielinski, Marcel | 6-3,6-3 |
| ITF M15 Szczawno | 2023/08/30 08:35 | Adam Majchrzak v Zielinski, Marcel | 2-6,3-6 |
| ITF M15 Huy | 2023/08/25 08:00 | Zielinski, Marcel v 코르윈, 펠릭스 | 6-1,1-6,3-6 |
| ITF M15 Huy | 2023/08/23 14:10 | Zielinski, Marcel v 팔라벨라, 라우타로 아거스틴 | 6-3,6-4 |
| ITF M15 Frankfurt Am Main | 2023/08/09 13:00 | Schnaitter, Jakob v Zielinski, Marcel | 6-7,6-2,6-2 |
| ITF M15 Eindhoven | 2023/08/03 11:20 | Moller, Elmer v Zielinski, Marcel | 6-3,6-1 |
| ITF M15 Eindhoven | 2023/08/01 15:20 | 보우레아우, 알렉시스 v Zielinski, Marcel | 1-6,1-6 |
| Koszalin, Singles Qualifying M-ITF-POL-02A | 2023/09/06 12:00 | Fryderyk Lechno-Wasiutynski v Henrik Bladelius | 6-3,6-3 |
| ITF M15 Szczawno | 2023/08/28 14:00 | Fryderyk Lechno-Wasiutynski v 필라르, 카롤 | 6-4,3-6,8-10 |
| ITF M15 Szczawno | 2023/08/28 08:30 | Philipp Pavlenko v Fryderyk Lechno-Wasiutynski | 4-6,1-6 |
| ITF M15 Szczawno | 2023/08/27 09:30 | Fryderyk Lechno-Wasiutynski v Andy Allen | 6-2,6-2 |
| ITF M25 Poznan | 2023/08/23 11:50 | Fryderyk Lechno-Wasiutynski v Compagnucci, Tommaso | 3-6,2-6 |
| ITF M25 Bielsko Biala | 2023/08/16 10:40 | Fryderyk Lechno-Wasiutynski v 올로브, 블라디슬라브 | 6-7,2-6 |
| ITF M25 Lodz | 2023/08/09 15:50 | Szajrych, Jasza v Fryderyk Lechno-Wasiutynski | 7-5,6-2 |
| ITF M15 Wroclaw | 2023/06/28 09:40 | Fryderyk Lechno-Wasiutynski v Matthew William Donald | 6-4,3-6,4-6 |