Geronimo Degreef defeated Rafael Serpa Guinazu 6-4 6-4 in the Argentina B Masters 3 round of 32 on clay. The upset overturned the form book — Rafael Serpa Guinazu came in leading the head-to-head 2–1. Geronimo Degreef narrowed the head-to-head to 2–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1996-11-02 | Uruguay Paraguay Masters 1 | R32 | clay | Geronimo Degreef | 6-4 6-4 |
| 1994-04-16 | Argentina 1 Masters 1 | R32 | clay | Rafael Serpa Guinazu | 7-5 6-3 |
| 1993-04-10 | Argentina 1 Masters 2 | R16 | clay | Rafael Serpa Guinazu | 6-1 6-3 |