Natsumi Hamamura defeated Rika Fujiwara 7-5 6-3 in the Nagoya 25K round of 16 on hard. The upset overturned the form book — Rika Fujiwara came in leading the head-to-head 3–0. Natsumi Hamamura claimed a first win over Rika Fujiwara in four meetings, narrowing the head-to-head to 3–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-07-27 | Obihiro-Tokachi 25K | R16 | carpet | Rika Fujiwara | 3-6 7-6(11) 6-2 |
| 2007-09-10 | Tokyo 50K | R16 | hard | Rika Fujiwara | 7-5 6-2 |
| 2007-05-21 | Nagano 25K | F | carpet | Rika Fujiwara | 7-5 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.