Federico Dondo defeated Gustavo Diaz 6-1 6-1 in the Argentina 3 Masters 1 round of 32 on clay. The upset overturned the form book — Gustavo Diaz came in leading the head-to-head 1–0. Federico Dondo claimed a first win over Gustavo Diaz in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1995-08-05 | Argentina B Masters 3 | R32 | clay | Gustavo Diaz | 6-1 7-5 |