Melisa Arevalo defeated Sabrina Valenti 6-0 6-4 in the Guayaquil 10K round of 16 on clay. The upset overturned the form book — Sabrina Valenti came in leading the head-to-head 1–0, but Melisa Arevalo had been the form player, winning 3 of their last 8 on clay. Melisa Arevalo claimed a first win over Sabrina Valenti in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1998-09-07 | Lima 10K | SF | clay | Sabrina Valenti | 6-3 7-5 |