Hiroyasu Ehara defeated Takuto Niki 1-6 6-3 6-2 in the Japan F6 qualifying round on grass. The upset overturned the form book — Takuto Niki came in leading the head-to-head 4–1. Hiroyasu Ehara narrowed the head-to-head to 4–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2018-04-02 | Japan F5 | R16 | hard | Hiroyasu Ehara | 6-2 2-6 6-4 |
| 2016-07-11 | Korea F5 | R16 | hard | Takuto Niki | 6-4 6-2 |
| 2015-03-23 | Japan F3 | R16 | hard | Takuto Niki | 4-6 6-3 6-3 |
| 2015-03-16 | Japan F2 | SF | hard | Takuto Niki | 6-3 6-7(2) 6-2 |
| 2012-03-19 | Japan F2 | SF | hard | Takuto Niki | 7-5 7-5 |
Averages over each player's completed matches in the selected window (40 vs 200). ATP, WTA & Challenger.
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About