Kazuki Shimizu defeated Daisuke Sumizawa 3-6 6-4 10-6 in the M25 Matsuyama 1 q16 on hard. The upset overturned the form book — Daisuke Sumizawa came in leading the head-to-head 1–0. Kazuki Shimizu claimed a first win over Daisuke Sumizawa in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2019-03-04 | M15 Nishi-Tama 1 | Q32 | hard | Daisuke Sumizawa | 6-2 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.