Luciana Sarmenti defeated Nataly Yoo 6-4 2-6 6-4 in the Asuncion 10K round of 32 on clay. The upset overturned the form book — Nataly Yoo came in leading the head-to-head 2–0. Luciana Sarmenti claimed a first win over Nataly Yoo in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2007-05-07 | Cordoba 10K | R32 | clay | Nataly Yoo | 6-2 6-4 |
| 2006-08-14 | Guayaquil 10K | R16 | hard | Nataly Yoo | 6-1 7-5 |