Marcello Wowk defeated Rafael Serpa Guinazu 6-1 6-7 6-4 in the Argentina B Masters 2 round of 16 on clay. The upset overturned the form book — Rafael Serpa Guinazu came in leading the head-to-head 3–0, but Marcello Wowk had been the form player, winning 5 of their last 10 on clay. Marcello Wowk claimed a first win over Rafael Serpa Guinazu in four meetings, narrowing the head-to-head to 3–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1995-09-30 | Argentina 3 Masters 1 | R32 | clay | Rafael Serpa Guinazu | 7-6 6-7 7-5 |
| 1995-08-05 | Argentina B Masters 4 | R32 | clay | Rafael Serpa Guinazu | 2-6 6-4 6-2 |
| 1994-08-13 | Argentina 3 Masters 4 | R32 | clay | Rafael Serpa Guinazu | 6-3 5-7 6-4 |