Hiroko Kuwata defeated Ayumi Oka 6-4 6-4 in the Makinohara 25K qualifying round on carpet. Hiroko Kuwata extended the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2012-03-19 | Kofu 10K | QF | hard | Hiroko Kuwata | 4-6 7-5 6-3 |
| 2011-04-25 | Gifu 50K | QF | hard | Ayumi Oka | 6-4 6-0 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.