Sebastian Weisz defeated Luis Valdez 6-3 7-5 in the Bolivia Chile Masters 2 round of 32 on clay. The upset overturned the form book — Luis Valdez came in leading the head-to-head 1–0. Sebastian Weisz claimed a first win over Luis Valdez in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1991-10-21 | Bolivia Chile Masters 4 | R16 | clay | Luis Valdez | 5-7 6-3 6-3 |