Juan Pablo Guzman defeated Matias Oneille 7-6 6-3 in the Chile F1 FUTURES round of 32 on clay. The upset overturned the form book — Matias Oneille came in leading the head-to-head 3–0, but Juan Pablo Guzman had been the form player, winning 7 of their last 10 on clay. Juan Pablo Guzman claimed a first win over Matias Oneille in four meetings, narrowing the head-to-head to 3–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2001-08-06 | Argentina F8 | R16 | clay | Matias Oneille | 7-5 2-1 |
| 2000-03-27 | Argentina F3 | R32 | clay | Matias Oneille | 5-7 6-1 6-1 |
| 1999-11-01 | Argentina F4 | R16 | clay | Matias Oneille | 6-3 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.