Carlos Engel defeated Luis Valdez 6-1 7-5 in the Brazil 5 Masters 4 round of 32 on clay. The upset overturned the form book — Luis Valdez came in leading the head-to-head 1–0, but Carlos Engel had been the form player, winning 6 of their last 10 on clay. Carlos Engel claimed a first win over Luis Valdez in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1991-05-13 | Brazil 3 Masters 3 | R32 | clay | Luis Valdez | 7-6 7-5 |