Matias Oneille defeated Ignacio Gonzalez King 6-3 6-1 in the Argentina 1 Masters 1 round of 32 on clay. The upset overturned the form book — Ignacio Gonzalez King came in leading the head-to-head 3–1. Matias Oneille narrowed the head-to-head to 3–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2002-09-23 | Bolivia F3 | R16 | clay | Ignacio Gonzalez King | 7-5 3-6 6-0 |
| 2001-10-15 | Paraguay F2 | R32 | clay | Ignacio Gonzalez King | 6-4 7-6(11) |
| 1999-07-26 | Uruguay F2 | R16 | clay | Matias Oneille | 6-2 0-6 6-4 |
| 1999-04-19 | Argentina F1 | R32 | clay | Ignacio Gonzalez King | 6-4 6-3 |