Luis Horna defeated Juan Antonio Marin 6-3 7-6 in the Acapulco round of 16 on hard. The upset overturned the form book — Juan Antonio Marin came in leading the head-to-head 1–0, defending last year's round of 32. Luis Horna claimed a first win over Juan Antonio Marin in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1999-04-26 | Atlanta | R32 | hard | Juan Antonio Marin | 6-4 6-3 |
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 (88 vs 16). ATP, WTA & Challenger.