Diego Varela defeated Luis Valdez 6-4 6-3 in the Brazil 5 Masters 3 qualifying round on clay. The upset overturned the form book — Luis Valdez came in leading the head-to-head 1–0. Diego Varela claimed a first win over Luis Valdez in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1991-09-02 | Brazil 6 Masters 1 | R32 | clay | Luis Valdez | 6-2 4-0 |