Antoaneta Pandjerova defeated Nathalie Vierin 6-4 2-6 6-1 in the Orbetello 25K round of 16 on clay. The upset overturned the form book — Nathalie Vierin came in leading the head-to-head 2–0, but Antoaneta Pandjerova had been the form player, winning 5 of their last 9 on clay. Antoaneta Pandjerova claimed a first win over Nathalie Vierin in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2002-09-16 | Luxembourg 25K | R16 | clay | Nathalie Vierin | 6-3 6-1 |
| 2001-10-22 | St Raphael 25K | QF | hard | Nathalie Vierin | 6-2 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.