Maciej Rajski defeated Jonas Pelle Hartenstein 6-4 6-2 in the M15 Koszalin 1 q16 on clay. The result followed the form book — Maciej Rajski came in leading the head-to-head 1–0. Maciej Rajski extended the head-to-head to 2–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2023-09-06 | M15 Koszalin 1 | R32 | clay | Maciej Rajski | 6-4 6-4 |