Daniela Olivera defeated Cecilia Guillenea 6-3 6-2 in the Azemeis 10K round of 32 on clay. The upset overturned the form book — Cecilia Guillenea came in leading the head-to-head 1–0. Daniela Olivera claimed a first win over Cecilia Guillenea in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1998-09-07 | Lima 10K | R32 | clay | Cecilia Guillenea | 6-3 6-3 |