Mariana Diaz Oliva defeated Petra Mandula 7-5 6-2 in the Fed Cup WG PO: HUN vs ARG round robin on clay. The upset overturned the form book — Petra Mandula came in leading the head-to-head 1–0. Mariana Diaz Oliva claimed a first win over Petra Mandula in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1999-10-04 | Sao Paulo | R32 | hard | Petra Mandula | 6-3 6-4 |
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About
Averages over each player's completed matches in the selected window (22 vs 15). ATP, WTA & Challenger.