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, levelling the head-to-head at 1–1.
Olivera D. took it in straight sets.
Daniela Olivera beat Cecilia Guillenea 6-3 6-2. Umpiry, "Daniela Olivera vs Cecilia Guillenea — Azemeis 10K Round of 32", https://umpiry.com/match/1999-05-31/guillenea-vs-olivera-azemeis-10k-r32?utm_source=cite (as of 31 May 1999).