Ryota Tanuma leads 3 to 1 over 4 singles meetings since 2024. Last meeting on 17/08/2026 at M25 Taipei.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 17/08/2026 | M25 Taipei | Qualifiers | hard | Koizumi | 6-1 5-3 |
| 08/07/2025 | M15 Tokyo | Qualifiers | hard | Tanuma | 6-3 7-6(6) |
| 03/07/2025 | M15 Tokyo | Round 2 | hard | Tanuma | 4-6 1-6 |
| 16/09/2024 | M25 Takasaki | Qualifiers | hard | Tanuma | 6-2 6-7(6) 10-4 |
| hard | Tanuma 3 - 1 Koizumi |
| 2026 | Tanuma 0 - 1 Koizumi |
| 2025 | Tanuma 2 - 0 Koizumi |
| 2024 | Tanuma 1 - 0 Koizumi |
106 wins, 74 losses since 2021 (58.9%).
Last matches: D V V V V
27 wins, 27 losses since 2021 (50.0%).
Last matches: D V D V D
Ryota Tanuma leads 3 to 1 over 4 singles meetings since 2024.
On 17/08/2026, at M25 Taipei (Qualifiers): Noritaka Koizumi won 6-1 5-3.