Ronaldo Carvalho defeated Oscar Zarzosa 6-7 6-3 6-4 in the Mexico F18 round of 32 on hard. The result followed the form book — Ronaldo Carvalho came in leading the head-to-head 2–0. Ronaldo Carvalho extended the head-to-head to 3–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2003-05-05 | Mexico F4 | R16 | hard | Ronaldo Carvalho | 6-3 6-3 |
| 2003-04-28 | Mexico F3 | R32 | clay | Ronaldo Carvalho | 6-2 6-1 |