Diego Hartfield defeated Mariano Zabaleta 6-3 7-5 in the Vina del Mar round of 32 on clay. The upset overturned the form book — Mariano Zabaleta came in leading the head-to-head 1–0, defending last year's round-robin. Diego Hartfield claimed a first win over Mariano Zabaleta in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-02-01 | Vina del Mar | Q16 | clay | Mariano Zabaleta | 0-6 6-4 7-6(4) |
Averages over each player's completed matches in the selected window (6 vs 1). ATP, WTA & Challenger.
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. Small sample — read as indicative. About