Mariano Puerta defeated Gaston Gaudio 3-6 6-4 6-2 in the Santiago semi-final on clay. The upset overturned the form book — Gaston Gaudio came in leading the head-to-head 5–0. Mariano Puerta claimed a first win over Gaston Gaudio in six meetings, narrowing the head-to-head to 5–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2005-11-14 | Masters Cup | RR | hard | Gaston Gaudio | 6-3 7-5 |
| 2005-02-07 | Buenos Aires | F | clay | Gaston Gaudio | 6-4 6-4 |
| 2003-02-17 | Buenos Aires | R32 | clay | Gaston Gaudio | 6-4 6-2 |
| 2001-05-14 | Hamburg Masters | R64 | clay | Gaston Gaudio | 6-2 6-3 |
| 1999-05-10 | Rome Masters | R64 | clay | Gaston Gaudio | 6-1 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 (161 vs 200). ATP, WTA & Challenger.