Natsumi Hamamura defeated Maya Kato 6-3 6-3 in the Obihiro 25K round of 16 on carpet. Natsumi Hamamura extended the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2008-05-26 | Gunma 25K | R32 | carpet | Maya Kato | 6-3 1-6 7-6(5) |
| 2006-08-14 | Tokyo 2 10K | R32 | hard | Natsumi Hamamura | 6-1 6-1 |