Aki Yamasoto defeated Kaori Onishi 6-4 7-5 in the Tokyo 10K round of 32 on hard. 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 |
|---|---|---|---|---|---|
| 2013-10-21 | Hamamatsu 25K | Q16 | grass | Aki Yamasoto | 6-4 3-6 6-2 |
| 2010-08-02 | Niigata 10K | SF | carpet | Aki Yamasoto | 7-6(5) 6-1 |