Carlos Zwetsch defeated Juan Pablo Etchecoin 3-6 6-4 6-2 in the Brazil 1 Masters 2 round of 32 on clay. The upset overturned the form book — Juan Pablo Etchecoin came in leading the head-to-head 1–0. Carlos Zwetsch claimed a first win over Juan Pablo Etchecoin in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1991-05-13 | Brazil 3 Masters 2 | QF | clay | Juan Pablo Etchecoin | 3-6 7-5 6-3 |