Yunosuke Tanaka defeated Takuto Niki 7-6 1-6 6-1 in the M15 Kashiwa 1 round of 16 on hard. The upset overturned the form book — Takuto Niki came in leading the head-to-head 1–0, but Yunosuke Tanaka had been the form player, winning 4 of their last 7 on hard. Yunosuke Tanaka claimed a first win over Takuto Niki in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2017-03-13 | Japan F2 | R32 | hard | Takuto Niki | 6-4 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.