Eugenia Maia defeated Geraldine Aizenberg 2-6 6-1 6-3 in the Asuncion 10K qualifying round on clay. The upset overturned the form book — Geraldine Aizenberg came in leading the head-to-head 2–0. Eugenia Maia claimed a first win over Geraldine Aizenberg in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1999-09-06 | Buenos Aires 10K | R32 | clay | Geraldine Aizenberg | 6-0 7-5 |
| 1996-07-01 | Sao Paulo 10K | QF | clay | Geraldine Aizenberg | 6-3 6-2 |