Gonzalo Fernandez defeated Hermes Gamonal 6-4 6-0 in the Chile Masters 4 qualifying round on clay. The upset overturned the form book — Hermes Gamonal came in leading the head-to-head 2–0. Gonzalo Fernandez claimed a first win over Hermes Gamonal in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1998-11-16 | Chile F1 | R16 | clay | Hermes Gamonal | 4-6 6-1 6-4 |
| 1997-11-08 | Chile 2 Masters 1 | R16 | clay | Hermes Gamonal | 6-1 6-7 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.