Tomoko Yonemura defeated Natsumi Hamamura 6-2 7-5 in the Hamanako 25K round of 32 on carpet. The upset overturned the form book — Natsumi Hamamura came in leading the head-to-head 3–1. Tomoko Yonemura narrowed 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 |
| 2007-05-21 | Nagano 25K | SF | carpet | Natsumi Hamamura | 7-6(7) 5-7 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.