Federico Pierini defeated Luis Valdez 6-4 6-4 in the Bolivia Chile Masters 4 qualifying round on clay. The result followed the form book — Federico Pierini came in leading the head-to-head 1–0. Federico Pierini extended the head-to-head to 2–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1991-04-15 | Brazil 2 Masters 1 | R16 | clay | Federico Pierini | 6-4 4-6 6-3 |