Enrique Perez Cassarino defeated Edvaldo Oliveira 6-0 7-6 in the Brazil 1 Masters 1 round of 16 on clay. The upset overturned the form book — Edvaldo Oliveira came in leading the head-to-head 1–0. Enrique Perez Cassarino claimed a first win over Edvaldo Oliveira in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1991-03-18 | Brazil 1 Masters 3 | R32 | clay | Edvaldo Oliveira | 7-6 6-4 |