Mari Tanaka defeated Kaori Onishi 6-1 6-4 in the Kyoto 10K round of 32 on carpet. Mari Tanaka extended the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2010-07-05 | Tokyo 10K | F | carpet | Kaori Onishi | 4-6 6-4 6-1 |
| 2009-06-08 | Tokyo 10K | R32 | hard | Mari Tanaka | 4-6 6-4 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.