Oscar Bustos defeated Diego Del Rio 7-5 7-6 in the Brazil 2 Masters 1 round of 32 on clay. The upset overturned the form book — Diego Del Rio came in leading the head-to-head 1–0. Oscar Bustos claimed a first win over Diego Del Rio in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1991-04-15 | Brazil 2 Masters 2 | R16 | clay | Diego Del Rio | 4-6 6-4 6-3 |