Masaki Sasai defeated Yusuke Watanuki 6-3 6-2 in the Japan F6 round of 16 on hard. The upset overturned the form book — Yusuke Watanuki came in leading the head-to-head 1–0. Masaki Sasai claimed a first win over Yusuke Watanuki in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2017-04-03 | Japan F5 | R32 | hard | Yusuke Watanuki | 6-2 6-2 |
Averages over each player's completed matches in the selected window (12 vs 47). 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