Gustavo Cavallaro defeated Rafael Serpa Guinazu 6-4 6-3 in the Argentina 2 Masters 3 round of 32 on clay. The upset overturned the form book — Rafael Serpa Guinazu came in leading the head-to-head 1–0. Gustavo Cavallaro claimed a first win over Rafael Serpa Guinazu in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1994-04-16 | Argentina 1 Masters 2 | R16 | clay | Rafael Serpa Guinazu | 4-6 6-4 6-3 |