Hector Moretti defeated Rafael Serpa Guinazu 6-3 6-3 in the Argentina F8 round of 16 on clay. The upset overturned the form book — Rafael Serpa Guinazu came in leading the head-to-head 2–0, but Hector Moretti had been the form player, winning 5 of their last 10 on clay. Hector Moretti claimed a first win over Rafael Serpa Guinazu in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1999-05-29 | Argentina 1 Masters 3 | R16 | clay | Rafael Serpa Guinazu | 7-6 4-6 6-4 |
| 1994-08-13 | Argentina 3 Masters 2 | R32 | clay | Rafael Serpa Guinazu | 5-7 6-4 6-4 |