Ken Onishi defeated Ryota Tanuma 6-4 3-6 6-1 in the Malaysia F2 round of 32 on hard. The upset overturned the form book — Ryota Tanuma came in leading the head-to-head 1–0. Ken Onishi claimed a first win over Ryota Tanuma in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2017-04-03 | Japan F5 | R32 | hard | Ryota Tanuma | 7-6(4) 6-2 |
Averages over each player's completed matches in the selected window (7 vs 22). 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