Hikaru Shiraishi defeated Ryota Tanuma 6-7 6-4 6-2 in the M15 Tokyo 1 quarter-final on hard. The result followed the form book — Hikaru Shiraishi came in ranked #488, leading the head-to-head 2–0. Hikaru Shiraishi extended the head-to-head to 3–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2025-10-24 | M15 Tanagura 1 | QF | hard | Hikaru Shiraishi | 6-3 2-6 6-4 |
| 2023-12-20 | M15 Yanagawa 1 | R32 | hard | Hikaru Shiraishi | 6-0 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.