Hermes Gamonal defeated Antonio Couvert 6-4 6-4 in the Argentina F5 round of 32 on clay. The upset overturned the form book — Antonio Couvert came in leading the head-to-head 1–0. Hermes Gamonal claimed a first win over Antonio Couvert in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1998-10-19 | Argentina F4 | R16 | clay | Antonio Couvert | 6-4 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.