Zuzana Valekova defeated Antonella Serra Zanetti 6-2 6-3 in the Juarez 25K round of 32 on clay. The upset overturned the form book — Antonella Serra Zanetti came in leading the head-to-head 1–0. Zuzana Valekova claimed a first win over Antonella Serra Zanetti in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1999-02-08 | Rogaska Slatina 25K | R32 | carpet | Antonella Serra Zanetti | 6-3 4-6 7-5 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.