Marta Marrero defeated Jelena Kostanic Tosic 7-6 6-1 in the Australian Open round of 128 on hard. The upset overturned the form book — Jelena Kostanic Tosic came in leading the head-to-head 3–0, defending last year's round of 64. Marta Marrero claimed a first win over Jelena Kostanic Tosic in four meetings, narrowing the head-to-head to 3–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2003-08-04 | Helsinki | R16 | clay | Jelena Kostanic Tosic | 6-1 6-2 |
| 2002-09-30 | Japan Open | R16 | hard | Jelena Kostanic Tosic | 5-7 6-0 6-2 |
| 2002-09-09 | Shanghai | R32 | hard | Jelena Kostanic Tosic | 6-4 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 (11 vs 47). ATP, WTA & Challenger.