Felix Mantilla defeated Sjeng Schalken 7-5 6-0 in the Buenos Aires round of 32 on clay. The upset overturned the form book — Sjeng Schalken came in leading the head-to-head 4–2. Felix Mantilla narrowed the head-to-head to 4–3.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2004-01-05 | Chennai | QF | hard | Sjeng Schalken | 6-2 5-7 7-6 |
| 2002-08-05 | Cincinnati Masters | R64 | hard | Sjeng Schalken | 7-6 4-6 6-3 |
| 2002-01-07 | Auckland | R16 | hard | Felix Mantilla | 6-4 6-4 |
| 2000-04-24 | Barcelona | R64 | clay | Felix Mantilla | 6-1 6-3 |
| 1995-10-02 | Valencia | SF | hard | Sjeng Schalken | 6-4 4-6 6-2 |
| 1993-11-06 | Israel 2 Masters 3 | R32 | hard | Sjeng Schalken | 6-4 7-5 |
Averages over each player's completed matches in the selected window (200 vs 200). 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. About