Nicole Thyssen defeated Andrea Sieveke 6-3 6-3 in the Athens 10K qualifying round on hard. The upset overturned the form book — Andrea Sieveke came in leading the head-to-head 1–0, but Nicole Thyssen had been the form player, winning 3 of their last 6 on hard. Nicole Thyssen claimed a first win over Andrea Sieveke in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2005-09-05 | Enschede 10K | R32 | clay | Andrea Sieveke | 6-4 5-7 6-4 |