Ramon Delgado defeated Mariano Zabaleta 6-2 7-5 in the Costa Do Sauipe round of 16 on hard. The upset overturned the form book — Mariano Zabaleta came in leading the head-to-head 1–0, defending last year's round of 16. Ramon Delgado claimed a first win over Mariano Zabaleta in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1998-11-02 | Bogota | F | hard | Mariano Zabaleta | 6-4 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 (62 vs 200). ATP, WTA & Challenger.