Mari Tanaka defeated Chinami Ogi 3-6 6-4 6-3 in the Hamanako 25K round of 32 on carpet. The upset overturned the form book — Chinami Ogi came in leading the head-to-head 1–0. Mari Tanaka claimed a first win over Chinami Ogi in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2011-03-14 | Miyazaki 10K | R32 | carpet | Chinami Ogi | 6-3 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.