Matias Oneille defeated Juan Pablo Brzezicki 6-2 2-6 6-2 in the Argentina 1 Masters 3 round of 16 on clay. The upset overturned the form book — Juan Pablo Brzezicki came in leading the head-to-head 3–2. Matias Oneille narrowed the head-to-head to 3–3.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2001-08-06 | Argentina F8 | SF | clay | Matias Oneille | 6-4 7-6(2) |
| 2000-09-25 | Brazil F2 | R16 | clay | Juan Pablo Brzezicki | 6-7(4) 7-5 1-0 |
| 2000-07-24 | Argentina F7 | QF | clay | Juan Pablo Brzezicki | 6-3 7-5 |
| 2000-05-22 | Argentina F6 | QF | clay | Juan Pablo Brzezicki | 6-3 4-6 7-6(3) |
| 2000-05-01 | Chile F6 | R32 | clay | Matias Oneille | 6-2 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.