Shuichi Sekiguchi defeated Seong Chan Hong 6-2 6-3 in the M25 Matsuyama 1 semi-final on hard. The upset overturned the form book — Seong Chan Hong came in leading the head-to-head 2–0, but Shuichi Sekiguchi had been the form player, winning 8 of their last 10 on hard. Shuichi Sekiguchi claimed a first win over Seong Chan Hong in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2019-03-17 | M15 Nishi-Tokyo 1 | F | hard | Seong Chan Hong | 7-6(4) 6-4 |
| 2018-03-12 | Japan F2 | R32 | hard | Seong Chan Hong | 6-4 1-6 7-6(2) |
Averages over each player's completed matches in the selected window (50 vs 131). 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