Nadejda Vassileva defeated Katerina Avdiyenko 6-4 0-6 7-5 in the Cairo 4 10K qualifying round on clay. The upset overturned the form book — Katerina Avdiyenko came in leading the head-to-head 1–0. Nadejda Vassileva claimed a first win over Katerina Avdiyenko in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2006-03-20 | Al Mansoura 10K | R16 | clay | Katerina Avdiyenko | 6-3 3-6 7-6(4) |