Natsumi Hamamura defeated Akiko Yonemura 7-5 6-2 in the Komoro 25K round of 32 on clay. The upset overturned the form book — Akiko Yonemura came in leading the head-to-head 2–0. Natsumi Hamamura claimed a first win over Akiko Yonemura in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2010-02-15 | Mildura 25K | R16 | grass | Akiko Yonemura | 6-4 6-1 |
| 2004-08-30 | Saitama 10K | R32 | hard | Akiko Yonemura | 6-3 4-6 6-3 |