Ayumi Oka defeated Chihiro Takayama 6-4 3-6 7-5 in the Noto 25K round of 32 on carpet. Ayumi Oka extended the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2010-06-07 | Tokyo 10K | R32 | hard | Chihiro Takayama | 6-3 1-1 |
| 2008-09-08 | Noto 25K | R32 | carpet | Ayumi Oka | 6-4 4-6 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.