Jelena Kostanic Tosic defeated Mariana Diaz Oliva 6-3 6-7 6-4 in the Australian Open round of 128 on hard. The upset overturned the form book — Mariana Diaz Oliva came in leading the head-to-head 2–0, defending last year's round of 128. Jelena Kostanic Tosic claimed a first win over Mariana Diaz Oliva in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2005-06-13 | s Hertogenbosch | R32 | grass | Mariana Diaz Oliva | 1-6 6-2 6-3 |
| 2001-04-30 | Bol | R16 | clay | Mariana Diaz Oliva | 6-4 6-2 |
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 (47 vs 22). ATP, WTA & Challenger.