Mayumi Yamamoto defeated Etsuko Kitazaki 6-2 6-4 in the Gunma 25K qualifying round on carpet. The upset overturned the form book — Etsuko Kitazaki came in leading the head-to-head 1–0. Mayumi Yamamoto claimed a first win over Etsuko Kitazaki in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2007-09-24 | Hiroshima 10K | QF | carpet | Etsuko Kitazaki | 5-0 |