Antonio Prieto defeated Carlos Zwetsch 6-2 6-2 in the Brazil 4 Masters 4 round of 16 on clay. The result followed the form book — Antonio Prieto came in leading the head-to-head 2–0. Antonio Prieto extended the head-to-head to 3–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1997-10-25 | Brazil 4 Masters 1 | R32 | clay | Antonio Prieto | 6-7 7-5 6-2 |
| 1996-10-19 | Brazil 4 Masters 3 | R16 | clay | Antonio Prieto | 7-6 7-5 |