Chihiro Takayama defeated Kaori Onishi 6-2 7-5 in the Kurume 50K q16 on grass. The upset overturned the form book — Kaori Onishi came in leading the head-to-head 1–0. Chihiro Takayama claimed a first win over Kaori Onishi in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2011-03-14 | Miyazaki 10K | R16 | carpet | Kaori Onishi | 6-2 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.