Ayumi Oka defeated Seiko Okamoto 7-6 4-6 6-4 in the Kusatsu 25K round of 32 on carpet. 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 |
|---|---|---|---|---|---|
| 2009-05-18 | Nagano 25K | R16 | carpet | Ayumi Oka | 6-3 4-6 6-2 |