Alejandro Aramburu defeated Joao Zwetsch 6-1 2-6 7-5 in the Uruguay Paraguay Masters 1 round of 16 on clay. The upset overturned the form book — Joao Zwetsch came in leading the head-to-head 1–0. Alejandro Aramburu claimed a first win over Joao Zwetsch in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1996-03-30 | Brazil 1 Masters 1 | QF | clay | Joao Zwetsch | 3-6 6-3 6-1 |