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