Carlos Engel defeated Oscar Bustos 5-7 7-6 6-3 in the Brazil 2 Masters 4 round of 16 on clay. The upset overturned the form book — Oscar Bustos 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 Oscar Bustos in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1991-03-18 | Brazil 1 Masters 2 | R32 | clay | Oscar Bustos | 7-5 6-7 7-6 |