Aki Yamasoto defeated Kaori Onishi 6-4 3-6 6-2 in the Hamamatsu 25K qualifying round of 16 on grass. The result followed the form book — Aki Yamasoto came in leading the head-to-head 2–0. Aki Yamasoto extended the head-to-head to 3–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2012-06-11 | Tokyo 10K | R32 | hard | Aki Yamasoto | 6-4 7-5 |
| 2010-08-02 | Niigata 10K | SF | carpet | Aki Yamasoto | 7-6(5) 6-1 |