Yu An Chen defeated Akiko Gunji 6-3 6-4 in the Ibaraki 1 10K round of 32 on hard. The upset overturned the form book — Akiko Gunji came in leading the head-to-head 1–0. Yu An Chen claimed a first win over Akiko Gunji in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1998-09-07 | Kugayama 4 10K | R16 | hard | Akiko Gunji | 6-0 6-0 |