Marcos Daniel defeated Matias Oneille 6-3 7-5 in the Brazil F3 round of 16 on clay. The upset overturned the form book — Matias Oneille came in leading the head-to-head 1–0. Marcos Daniel claimed a first win over Matias Oneille in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2000-09-11 | Peru F3 | SF | clay | Matias Oneille | 7-5 7-6(4) |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.