Rodrigo Cerdera defeated Federico Dondo 6-4 6-1 in the Argentina 1 Masters 4 semi-final on clay. The upset overturned the form book — Federico Dondo came in leading the head-to-head 3–1, but Rodrigo Cerdera had been the form player, winning 5 of their last 10 on clay. Rodrigo Cerdera narrowed the head-to-head to 3–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1999-04-19 | Argentina F1 | R16 | clay | Rodrigo Cerdera | 6-4 1-6 6-3 |
| 1998-04-20 | Argentina F1 | R16 | clay | Federico Dondo | 7-6 4-6 6-3 |
| 1997-04-05 | Argentina 1 Masters 1 | F | clay | Federico Dondo | 4-6 6-4 6-3 |
| 1995-09-02 | Argentina 2 Masters 4 | R32 | clay | Federico Dondo | 2-6 6-3 6-2 |