Natsumi Hamamura defeated Mari Inoue 7-5 6-7 6-3 in the Tokachi 250K round of 32 on carpet. The result followed the form book — Natsumi Hamamura came in leading the head-to-head 2–0. Natsumi Hamamura extended the head-to-head to 3–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2011-10-24 | Hamanako 25K | R32 | carpet | Natsumi Hamamura | 6-7(4) 6-2 6-3 |
| 2010-05-03 | Bundaberg 25K | QF | clay | Natsumi Hamamura | 6-2 6-2 |