Ko Suzuki defeated Ryusuke Horiuchi 6-3 6-4 in the M25 Sapporo 2 q32 on hard. The upset overturned the form book — Ryusuke Horiuchi came in leading the head-to-head 2–0. Ko Suzuki claimed a first win over Ryusuke Horiuchi in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2024-09-15 | M25 Takasaki 1 | Q32 | hard | Ryusuke Horiuchi | 7-6(3) 6-4 |
| 2022-09-08 | M25 Sapporo 2 | R16 | hard | Ryusuke Horiuchi | 6-2 3-6 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.