Matias Niemiz defeated Antonio Pastorino 7-6 6-3 in the Uruguay F1 round of 32 on clay. The upset overturned the form book — Antonio Pastorino came in leading the head-to-head 1–0. Matias Niemiz claimed a first win over Antonio Pastorino in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2006-11-27 | Uruguay F4 | R16 | clay | Antonio Pastorino | 6-1 6-0 |