Akari Inoue defeated Chihiro Nunome 7-5 6-2 in the Niigata 25K q16 on hard. The upset overturned the form book — Chihiro Nunome came in leading the head-to-head 2–1. Akari Inoue narrowed the head-to-head to 2–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2015-06-08 | Kashiwa $25K | Q16 | hard | Chihiro Nunome | 1-6 6-1 7-6(4) |
| 2013-03-18 | Kofu 10K | R16 | hard | Chihiro Nunome | 6-4 6-4 |
| 2012-03-26 | Nishi Tama 10K | Q16 | hard | Akari Inoue | 6-0 6-7(6) 2-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.