Jelena Kostanic Tosic defeated Zuzana Valekova 6-3 6-1 in the Biograd 10K round of 32 on clay. The upset overturned the form book — Zuzana Valekova came in leading the head-to-head 1–0, but Jelena Kostanic Tosic had been the form player, winning 1 of their last 5 on clay. Jelena Kostanic Tosic claimed a first win over Zuzana Valekova in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1998-03-25 | Makarska Satellite 10K | QF | clay | Zuzana Valekova | 6-3 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.