Ruben Alvarenga defeated Egberto Caldas 7-6 6-4 in the Brazil 5 Masters 4 round of 16 on clay. The upset overturned the form book — Egberto Caldas came in leading the head-to-head 1–0. Ruben Alvarenga claimed a first win over Egberto Caldas in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1991-07-15 | Brazil 5 Masters 3 | R32 | clay | Egberto Caldas | 6-1 6-3 |