Jumpei Yamasaki defeated Yusuke Watanuki 6-7 6-4 7-6 in the Japan F4 round of 32 on hard. The upset overturned the form book — Yusuke Watanuki came in leading the head-to-head 1–0, but Jumpei Yamasaki had been the form player, winning 3 of their last 5 on hard. Jumpei Yamasaki claimed a first win over Yusuke Watanuki in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2015-03-30 | Japan F4 | R16 | hard | Yusuke Watanuki | 7-6(0) 6-3 |
Averages over each player's completed matches in the selected window (200 vs 8). 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