Mari Inoue defeated Miyabi Inoue 6-3 7-6 in the Makinohara 25K round of 32 on carpet. The upset overturned the form book — Miyabi Inoue came in leading the head-to-head 2–0. Mari Inoue claimed a first win over Miyabi Inoue in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2011-05-02 | Fukuoka 50K | Q32 | grass | Miyabi Inoue | 6-2 4-6 6-2 |
| 2010-11-15 | Hyogo 10K | QF | carpet | Miyabi Inoue | 6-4 6-0 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.