Mariano Zabaleta defeated Franco Squillari 6-3 6-3 in the Vina del Mar round of 16 on clay. The upset overturned the form book — Franco Squillari came in leading the head-to-head 2–1. Mariano Zabaleta narrowed the head-to-head to 2–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1999-08-02 | Amsterdam | R16 | clay | Mariano Zabaleta | 7-5 6-4 |
| 1999-04-26 | Munich | SF | clay | Franco Squillari | 4-6 6-1 6-2 |
| 1998-10-05 | Palermo | QF | clay | Franco Squillari | 5-7 6-4 6-3 |
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 140). ATP, WTA & Challenger.