Erika Takao defeated Ai Yamamoto 6-2 5-7 6-1 in the Noto 25K round of 16 on carpet. The upset overturned the form book — Ai Yamamoto came in leading the head-to-head 1–0. Erika Takao claimed a first win over Ai Yamamoto in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-07-27 | Obihiro-Tokachi 25K | R32 | carpet | Ai Yamamoto | 6-2 7-5 |