Mariano Zabaleta defeated Oscar Hernandez 6-1 6-4 in the Buenos Aires round of 16 on clay. The result followed the form book — Mariano Zabaleta came in leading the head-to-head 1–0, defending last year's round of 16. Mariano Zabaleta extended the head-to-head to 2–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2004-07-19 | Kitzbuhel | R32 | clay | Mariano Zabaleta | 7-6(5) 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 (114 vs 184). ATP, WTA & Challenger.