Keisuke Watanuki defeated Takuto Niki 6-4 7-6 in the Japan F7 round of 32 on hard. The upset overturned the form book — Takuto Niki came in leading the head-to-head 3–0. Keisuke Watanuki claimed a first win over Takuto Niki in four meetings, narrowing the head-to-head to 3–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2016-03-07 | Japan F1 | R32 | hard | Takuto Niki | 7-5 6-2 |
| 2015-06-08 | Japan F6 | R16 | hard | Takuto Niki | 6-7(6) 7-6(1) 6-4 |
| 2014-03-24 | Japan F3 | R32 | hard | Takuto Niki | 6-3 6-1 |
Averages over each player's completed matches in the selected window (9 vs 181). 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