Toshihide Matsui defeated Shuichi Sekiguchi 6-1 6-1 in the Japan F9 round of 16 on hard. The upset overturned the form book — Shuichi Sekiguchi came in leading the head-to-head 1–0. Toshihide Matsui claimed a first win over Shuichi Sekiguchi in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2015-06-15 | Thailand F4 | SF | hard | Shuichi Sekiguchi | 6-4 6-4 |
Averages over each player's completed matches in the selected window (94 vs 200). 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