Sarah Riske defeated Natalia Garbellotto 6-2 6-3 in the Obregon 10K round of 32 on hard. The upset overturned the form book — Natalia Garbellotto came in leading the head-to-head 1–0. Sarah Riske claimed a first win over Natalia Garbellotto in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2004-03-22 | Monterrey 10K | QF | hard | Natalia Garbellotto | 4-6 6-2 6-4 |