Mariana Diaz Oliva defeated Miriam Schnitzer 6-4 6-4 in the Vienna round of 32 on clay. The upset overturned the form book — Miriam Schnitzer came in leading the head-to-head 1–0. Mariana Diaz Oliva claimed a first win over Miriam Schnitzer in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1999-05-10 | Berlin | R64 | grass | Miriam Schnitzer | 6-4 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.