Akiko Kinebuchi defeated Mayumi Yamamoto 6-3 7-5 in the Gunma 10K round of 32 on carpet. The upset overturned the form book — Mayumi Yamamoto came in leading the head-to-head 1–0. Akiko Kinebuchi claimed a first win over Mayumi Yamamoto in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2003-05-12 | Nagano 10K | R32 | grass | Mayumi Yamamoto | 7-6(2) 6-3 |