Miguel Gallardo Valles defeated Diego Acuna 6-4 6-4 in the Mexico 1 Masters 1 round of 32 on hard. The upset overturned the form book — Diego Acuna came in leading the head-to-head 1–0, but Miguel Gallardo Valles had been the form player, winning 6 of their last 8 on hard. Miguel Gallardo Valles claimed a first win over Diego Acuna in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2003-10-13 | Mexico F17 | R32 | hard | Diego Acuna | 6-3 7-5 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.