David Nalbandian defeated Felix Mantilla 6-2 6-3 in the Umag quarter-final on clay. The upset overturned the form book — Felix Mantilla came in defending last year's round of 32, but David Nalbandian had been the form player, winning 4 of their last 6 on clay. David Nalbandian extended the head-to-head to 3–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2004-04-19 | Monte Carlo Masters | R32 | clay | David Nalbandian | 6-0 5-7 7-6(4) |
| 2003-05-05 | Rome Masters | R64 | clay | Felix Mantilla | 6-3 1-6 6-0 |
| 2001-09-24 | Palermo | F | clay | Felix Mantilla | 7-6(2) 6-4 |
| 2001-02-12 | Vina del Mar | R32 | clay | David Nalbandian | 6-3 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 (200 vs 200). ATP, WTA & Challenger.