Hiroyasu Ehara defeated Takuto Niki 6-2 2-6 6-4 in the Japan F5 round of 16 on hard. 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 |
|---|---|---|---|---|---|
| 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 |
| 2012-06-18 | Japan F6 | QF | grass | Hiroyasu Ehara | 1-6 6-3 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 (15 vs 108). 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