Hikaru Shiraishi defeated Issei Okamura 6-2 6-2 in the M15 Hinode 1 round of 16 on hard. Hikaru Shiraishi claimed a first win over Issei Okamura in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2019-03-12 | M15 Nishi-Tokyo 1 | Q16 | hard | Issei Okamura | 6-2 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.