Level, 1 wins each over 2 singles meetings since 2025. Last meeting on 01/07/2025 at M15 Tokyo.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 01/07/2025 | M15 Tokyo | Round 1 | hard | Koyama | 6-7(2) 7-6(7) 6-1 |
| 18/03/2025 | M15 Nishi-Tokyo | Round 1 | hard | Sach | 6-2 6-3 |
| hard | Sach 1 - 1 Koyama |
| 2025 | Sach 1 - 1 Koyama |
160 wins, 127 losses since 2021 (55.7%).
Last matches: D V D V V
38 wins, 41 losses since 2021 (48.1%).
Last matches: D D V V V
Level, 1 wins each over 2 singles meetings since 2025.
On 01/07/2025, at M15 Tokyo (Round 1): Hiromasa Koyama won 6-7(2) 7-6(7) 6-1.