Marcella Koek defeated Petra Mokra 6-2 2-6 6-3 in the Michalovce 10K round of 32 on clay. The upset overturned the form book — Petra Mokra came in leading the head-to-head 1–0. Marcella Koek claimed a first win over Petra Mokra in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2006-10-23 | Pretoria 10K | R32 | hard | Petra Mokra | 5-7 6-4 6-4 |