Chihiro Takayama advanced when Sakiko Shimizu retired 6-7 6-3 4-1 in the Noto 25K q16. Chihiro Takayama extended the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2011-08-29 | Tsukuba 25K | Q32 | hard | Chihiro Takayama | 6-4 6-3 |
| 2007-10-29 | Kofu 10K | R16 | hard | Sakiko Shimizu | 6-2 7-5 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.