Kacper Owsian defeated Andrzej Mach 1-6 7-5 6-4 in the Poland F7 round of 16 on clay. The upset overturned the form book — Andrzej Mach came in leading the head-to-head 1–0. Kacper Owsian claimed a first win over Andrzej Mach in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2008-08-18 | Poland F5 | R32 | clay | Andrzej Mach | 4-6 6-1 6-0 |