Luis Valdez defeated Sebastian Weisz 5-7 6-3 6-3 in the Bolivia Chile Masters 4 round of 16 on clay. The upset overturned the form book — Sebastian Weisz came in leading the head-to-head 1–0. Luis Valdez claimed a first win over Sebastian Weisz in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1991-10-21 | Bolivia Chile Masters 2 | R32 | clay | Sebastian Weisz | 6-3 7-5 |