Natsumi Hamamura defeated Maika Ozaki 6-1 7-6 in the Tokyo 2 10K round of 16 on hard. 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 |
| 2004-09-20 | Hiroshima 10K | QF | grass | Natsumi Hamamura | 6-2 6-4 |
| 2004-07-12 | Gunma 25K | R32 | carpet | Natsumi Hamamura | 6-1 6-3 |