Natsumi Hamamura defeated Maika Ozaki 6-1 6-3 in the Gunma 25K round of 32 on carpet. The result followed the form book — Natsumi Hamamura came in leading the head-to-head 2–1. Natsumi Hamamura extended the head-to-head to 3–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2006-09-11 | Hiroshima 10K | SF | carpet | Maika Ozaki | 6-2 6-3 |
| 2006-08-14 | Tokyo 2 10K | R16 | hard | Natsumi Hamamura | 6-1 7-6(4) |
| 2004-09-20 | Hiroshima 10K | QF | grass | Natsumi Hamamura | 6-2 6-4 |