Katerina Avdiyenko defeated Nadejda Vassileva 6-3 3-6 7-6 in the Al Mansoura 10K round of 16 on clay. The upset overturned the form book — Nadejda Vassileva came in leading the head-to-head 1–0. Katerina Avdiyenko claimed a first win over Nadejda Vassileva in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2004-11-22 | Cairo 4 10K | QF | clay | Nadejda Vassileva | 6-4 0-6 7-5 |