Mauricio Aquino defeated Carlos Engel 6-1 6-4 in the Brazil 5 Masters 1 round of 32 on clay. The upset overturned the form book — Carlos Engel came in leading the head-to-head 1–0. Mauricio Aquino claimed a first win over Carlos Engel in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1991-09-02 | Brazil 6 Masters 4 | R32 | clay | Carlos Engel | 6-4 6-3 |