Ruben Ramirez Hidalgo defeated Mariano Zabaleta 7-5 6-3 in the Acapulco round of 16 on hard. The upset overturned the form book — Mariano Zabaleta came in leading the head-to-head 1–0, defending last year's final. Ruben Ramirez Hidalgo claimed a first win over Mariano Zabaleta in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2004-02-09 | Vina del Mar | R16 | clay | Mariano Zabaleta | 6-3 4-6 6-1 |
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 (200 vs 114). ATP, WTA & Challenger.