Ronaldo Carvalho defeated Guillermo Carter 3-6 6-1 6-4 in the Mexico F7 round of 16 on hard. The upset overturned the form book — Guillermo Carter came in leading the head-to-head 1–0. Ronaldo Carvalho claimed a first win over Guillermo Carter in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2003-03-31 | Mexico F1 | R16 | hard | Guillermo Carter | 6-4 3-6 7-6(4) |