Ronaldo Carvalho defeated Oscar Zarzosa 6-2 6-1 in the Mexico F3 round of 32 on clay. 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 |
|---|---|---|---|---|---|
| 2003-10-20 | Mexico F18 | R32 | hard | Ronaldo Carvalho | 6-7(5) 6-3 6-4 |
| 2003-05-05 | Mexico F4 | R16 | hard | Ronaldo Carvalho | 6-3 6-3 |