Hermes Gamonal defeated Miguel Tobon 6-4 6-7 6-3 in the Chile F4 round of 32 on clay. The upset overturned the form book — Miguel Tobon came in leading the head-to-head 1–0. Hermes Gamonal claimed a first win over Miguel Tobon in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1998-08-17 | Ecuador F3 | QF | clay | Miguel Tobon | 6-1 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.