Natsumi Hamamura defeated Tomoko Yonemura 7-6 5-7 6-4 in the Nagano 25K semi-final on carpet. Natsumi Hamamura extended the head-to-head to 3–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-09-28 | Hamanako 25K | SF | carpet | Tomoko Yonemura | 3-6 6-3 6-2 |
| 2007-09-17 | Tsukuba 25K | R32 | hard | Natsumi Hamamura | 7-5 6-1 |
| 2007-05-28 | Gunma 25K | R16 | carpet | Natsumi Hamamura | 6-4 1-6 6-4 |
| 2006-10-23 | Hamanako 25K | R32 | carpet | Tomoko Yonemura | 6-2 7-5 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.