Hiroko Mochizuki defeated Sung Hee Park 7-5 6-7 6-4 in the Gifu 50K round of 32 on carpet. The upset overturned the form book — Sung Hee Park came in leading the head-to-head 2–0. Hiroko Mochizuki claimed a first win over Sung Hee Park in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1998-05-04 | Seoul I 25K | R16 | clay | Sung Hee Park | 6-0 6-3 |
| 1997-03-17 | Noda 25K | R32 | hard | Sung Hee Park | 6-3 4-6 6-2 |