Geraldine Aizenberg defeated Hiroko Mochizuki 7-6 3-6 6-1 in the Jakarta 50K round of 32 on clay. The upset overturned the form book — Hiroko Mochizuki came in leading the head-to-head 1–0. Geraldine Aizenberg claimed a first win over Hiroko Mochizuki in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1998-04-29 | Gifu 50K | R32 | carpet | Hiroko Mochizuki | 6-3 1-6 6-3 |