Matias Oneille defeated Juan Pablo Guzman 5-7 6-1 6-1 in the Argentina F3 round of 32 on clay. The result followed the form book — Matias Oneille came in leading the head-to-head 2–1. Matias Oneille extended 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 |
| 2000-02-19 | Chile F1 FUTURES | R32 | clay | Juan Pablo Guzman | 7-6(1) 6-3 |
| 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.