Ryota Tanuma defeated N. Koizumi 6-3 7-6 in the M15 Tokyo 2 q16 on hard. Ryota Tanuma extended the head-to-head to 3–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2025-07-03 | M15 Tokyo 1 | R16 | hard | Ryota Tanuma | 6-4 6-1 |
| 2024-09-16 | M25 Takasaki 1 | Q16 | hard | Ryota Tanuma | 6-2 6-7(6) 10-4 |