Federico Cardinali defeated Matias Oneille 6-4 6-7 6-4 in the Italy 5 3 round of 32 on clay. The upset overturned the form book — Matias Oneille came in leading the head-to-head 1–0. Federico Cardinali claimed a first win over Matias Oneille in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2000-09-11 | Peru F3 | R32 | clay | Matias Oneille | 7-6(3) 6-3 |