Matias Oneille defeated Cristian Villagran 2-6 6-4 7-5 in the Argentina F8 qualifying round on clay. The upset overturned the form book — Cristian Villagran came in leading the head-to-head 2–1. Matias Oneille 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 |
| 2000-11-27 | Chile F8 | R32 | clay | Cristian Villagran | 7-5 4-6 6-4 |
| 2000-07-24 | Argentina F7 | R32 | clay | Matias Oneille | 6-2 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.