Jumpei Yamasaki leads 3 to 2 over 5 singles meetings since 2023. Last meeting on 06/05/2026 at M25 Nakhon Pathom.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 06/05/2026 | M25 Nakhon Pathom | Round 1 | hard | Kumasaka | 6-2 6-2 |
| 19/09/2025 | M25 Takasaki | Quarter-final | hard | Kumasaka | 7-6 0-6 3-5 |
| 29/12/2023 | M15 Yanagawa | Quarter-final | hard | Yamasaki | 6-1 6-4 |
| 07/09/2023 | M25 Sapporo | Round 2 | hard | Yamasaki | 6-1 5-4 |
| 01/06/2023 | M15 Karuizawa | Round 2 | clay | Yamasaki | 6-3 6-2 |
| hard | Yamasaki 2 - 2 Kumasaka |
| clay | Yamasaki 1 - 0 Kumasaka |
| 2026 | Yamasaki 0 - 1 Kumasaka |
| 2025 | Yamasaki 0 - 1 Kumasaka |
| 2023 | Yamasaki 3 - 0 Kumasaka |
100 wins, 81 losses since 2021 (55.2%).
Last matches: D D V V V
155 wins, 107 losses since 2021 (59.2%).
Last matches: D D V D D
Jumpei Yamasaki leads 3 to 2 over 5 singles meetings since 2023.
On 06/05/2026, at M25 Nakhon Pathom (Round 1): Takuya Kumasaka won 6-2 6-2.