Ayumi Oka defeated Ai Yamamoto 6-2 7-5 in the Sutama 10K round of 32 on clay. The result followed the form book — Ayumi Oka came in leading the head-to-head 1–0. Ayumi Oka extended the head-to-head to 2–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2011-09-12 | Kyoto 10K | R16 | carpet | Ayumi Oka | 6-3 6-1 |