Matias Oneille defeated Sebastian Decoud 4-6 7-5 6-0 in the Argentina F6 round of 16 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 |
|---|---|---|---|---|---|
| 2003-10-27 | Argentina F5 | R32 | clay | Sebastian Decoud | 6-4 6-4 |
| 2003-08-25 | Argentina F2 | R32 | clay | Matias Oneille | 6-1 6-1 |
| 2000-05-01 | Chile F6 | R16 | clay | Matias Oneille | 6-3 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.