Mateusz Cislo defeated Marcel Politowicz 4-6 6-3 10-7 in the M15 Koszalin 1 q32 on clay. The upset overturned the form book — Marcel Politowicz came in leading the head-to-head 1–0. Mateusz Cislo claimed a first win over Marcel Politowicz in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2023-08-13 | M25 Bielsko Biala 1 | Q32 | clay | Marcel Politowicz | 6-7(2) 6-1 10-4 |