Naoki Koizumi defeated Ryota Tanuma in the quarterfinals of the M25 Taipei tournament. The match ended with a score of 6-1, 6-3 in favor of Koizumi.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2025-07-08 | M15 Tokyo 2 | Q16 | hard | Ryota Tanuma | 6-3 7-6(6) |
| 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 |