Kotomi Takahata defeated Hirono Watanabe 6-4 1-6 6-2 in the Makinohara 25K round of 32 on grass. The result followed the form book — Kotomi Takahata came in leading the head-to-head 3–1. Kotomi Takahata extended the head-to-head to 4–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2015-09-07 | Kyoto $10K | R32 | hard | Hirono Watanabe | 6-4 6-2 |
| 2015-03-23 | Nishi Tama $10K | R32 | hard | Kotomi Takahata | 7-6(1) 6-4 |
| 2014-11-17 | Toyota 75K | Q16 | carpet | Kotomi Takahata | 6-1 6-1 |
| 2014-06-09 | Kashiwa 10K | R32 | hard | Kotomi Takahata | 6-4 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.