Natalia Garbellotto defeated Sarah Riske 4-6 6-2 6-4 in the Monterrey 10K qualifying round on hard. The upset overturned the form book — Sarah Riske came in leading the head-to-head 1–0. Natalia Garbellotto claimed a first win over Sarah Riske in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2004-03-29 | Obregon 10K | R32 | hard | Sarah Riske | 6-2 6-3 |