Maciej Domka defeated Aleksander Mierzwinski 6-3 6-2 in the Poland F1 round of 32 on clay. The upset overturned the form book — Aleksander Mierzwinski came in leading the head-to-head 1–0. Maciej Domka claimed a first win over Aleksander Mierzwinski in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1999-06-14 | Poland F2 | R32 | clay | Aleksander Mierzwinski | 6-4 6-1 |