Stefanie Haidner defeated Nathalie Vierin 3-6 7-6 7-5 in the Lecce 10K round of 16 on clay. The upset overturned the form book — Nathalie Vierin came in leading the head-to-head 3–0, but Stefanie Haidner had been the form player, winning 3 of their last 9 on clay. Stefanie Haidner claimed a first win over Nathalie Vierin in four meetings, narrowing the head-to-head to 3–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2004-09-06 | Fano 50K | R32 | clay | Nathalie Vierin | 6-2 6-4 |
| 2002-09-23 | Lecce 25K | R32 | clay | Nathalie Vierin | 6-3 6-0 |
| 1998-07-21 | Lido Di Camaiore 10K | R16 | clay | Nathalie Vierin | 6-4 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.