Marcella Koek defeated Karolina Wlodarczak 7-5 7-6 in the Wiesbaden 10K semi-final on clay. The upset overturned the form book — Karolina Wlodarczak came in leading the head-to-head 1–0. Marcella Koek claimed a first win over Karolina Wlodarczak in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-06-15 | Lenzerheide 10K | R32 | clay | Karolina Wlodarczak | 7-5 6-4 |