Patricia Aznar defeated Gisela Riera Roura 6-4 6-0 in the Zaragoza 10K round of 32 on clay. The upset overturned the form book — Gisela Riera Roura came in leading the head-to-head 1–0, but Patricia Aznar had been the form player, winning 3 of their last 6 on clay. Patricia Aznar claimed a first win over Gisela Riera Roura in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1999-07-12 | Getxo 25K | R32 | clay | Gisela Riera Roura | 7-5 7-6 |