Riko Sawayanagi defeated Makoto Ninomiya 6-4 6-4 in the Kashiwa 10K round of 16 on hard. The result followed the form book — Riko Sawayanagi came in leading the head-to-head 2–0. Riko Sawayanagi extended the head-to-head to 3–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2015-05-25 | Changwon $25K | R32 | hard | Riko Sawayanagi | 6-1 6-2 |
| 2014-10-13 | Makinohara 25K | R32 | grass | Riko Sawayanagi | 6-3 4-6 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.