Hermes Gamonal defeated Raul Valdes 6-3 7-6 in the Chile 1 Masters 4 round of 32 on clay. The upset overturned the form book — Raul Valdes came in leading the head-to-head 1–0, but Hermes Gamonal had been the form player, winning 4 of their last 10 on clay. Hermes Gamonal claimed a first win over Raul Valdes in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1998-05-02 | Chile 2 Masters 2 | R16 | clay | Raul Valdes | 3-6 6-4 6-0 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.