Cristian Villagran defeated Matias Oneille 7-5 4-6 6-4 in the Chile F8 round of 32 on clay. The upset overturned the form book — Matias Oneille came in leading the head-to-head 2–1, but Cristian Villagran had been the form player, winning 8 of their last 10 on clay. Cristian Villagran narrowed the head-to-head to 2–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2005-09-19 | Argentina F12 | R32 | clay | Cristian Villagran | 2-6 7-5 6-3 |
| 2000-07-31 | Argentina F8 | QF | clay | Matias Oneille | 2-6 6-4 7-5 |
| 2000-07-24 | Argentina F7 | R32 | clay | Matias Oneille | 6-2 6-3 |