Mariana Diaz Oliva defeated Lilia Osterloh 7-6 7-6 in the Los Angeles round of 64 on hard. The upset overturned the form book — Lilia Osterloh came in leading the head-to-head 1–0, defending last year's round of 64. Mariana Diaz Oliva claimed a first win over Lilia Osterloh in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1998-03-31 | Phoenix 50K | R32 | hard | Lilia Osterloh | 6-2 6-0 |
Averages over each player's completed matches in the selected window (12 vs 48). ATP, WTA & Challenger.
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About