Sakiko Shimizu defeated Chihiro Takayama 6-2 7-5 in the Kofu 10K round of 16 on hard. The upset overturned the form book — Chihiro Takayama came in leading the head-to-head 2–0. Sakiko Shimizu claimed a first win over Chihiro Takayama in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2011-09-05 | Noto 25K | Q16 | carpet | Chihiro Takayama | 6-7(4) 6-3 4-1 |
| 2011-08-29 | Tsukuba 25K | Q32 | hard | Chihiro Takayama | 6-4 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.