Sheila Guerberg defeated Mariana Conde 6-1 6-2 in the Cordoba 10K round of 32 on clay. The upset overturned the form book — Mariana Conde came in leading the head-to-head 1–0. Sheila Guerberg claimed a first win over Mariana Conde in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2004-10-11 | Campo Grande 10K | R16 | clay | Mariana Conde | 5-7 6-1 6-3 |