Matias Oneille defeated Juan Martin Aranguren 6-4 2-6 6-3 in the Argentina F1 round of 16 on clay. The upset overturned the form book — Juan Martin Aranguren came in leading the head-to-head 1–0. Matias Oneille claimed a first win over Juan Martin Aranguren in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2005-09-12 | Uruguay F1 | R32 | clay | Juan Martin Aranguren | 6-1 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.