Matias Oneille defeated Bo Ram Cha 6-2 1-6 6-3 in the Argentina F1 round of 32 on clay. The upset overturned the form book — Bo Ram Cha came in leading the head-to-head 1–0. Matias Oneille claimed a first win over Bo Ram Cha in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2003-04-07 | Chile F1 | R32 | clay | Bo Ram Cha | 6-4 6-2 |