David Sanchez defeated Gaston Gaudio 7-5 3-6 6-2 in the Vina del Mar quarter-final on clay. The upset overturned the form book — Gaston Gaudio came in leading the head-to-head 6–0, defending last year's semi-final, but David Sanchez had been the form player, winning 4 of their last 9 on clay. David Sanchez claimed a first win over Gaston Gaudio in seven meetings, narrowing the head-to-head to 6–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2005-05-09 | Hamburg Masters | R64 | clay | Gaston Gaudio | 6-2 6-2 |
| 2005-01-31 | Vina del Mar | R16 | clay | Gaston Gaudio | 6-4 6-2 |
| 2003-05-12 | Hamburg Masters | R32 | clay | Gaston Gaudio | 6-7(8) 6-3 6-1 |
| 2003-04-21 | Barcelona | R16 | clay | Gaston Gaudio | 7-5 4-6 6-1 |
| 2003-02-24 | Acapulco | R32 | hard | Gaston Gaudio | 1-6 6-4 6-4 |
| 2002-02-11 | Vina del Mar | R32 | clay | Gaston Gaudio | 6-7(6) 6-2 7-6(6) |
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 (69 vs 200). ATP, WTA & Challenger.