Level, 1 wins each over 2 singles meetings since 2024. Last meeting on 01/06/2025 at Lexus Birmingham Open - Birmingham.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 01/06/2025 | Lexus Birmingham Open - Birmingham | Qualifiers | grass | Ishii | 6-3 6-7(3) 3-6 |
| 05/04/2024 | W50 Kashiwa | Quarter-final | hard | Hartono |
| grass | Hartono 0 - 1 Ishii |
| hard | Hartono 1 - 0 Ishii |
| 2025 | Hartono 0 - 1 Ishii |
| 2024 | Hartono 1 - 0 Ishii |
170 wins, 144 losses since 2021 (54.1%).
Last matches: D V D V D
129 wins, 90 losses since 2021 (58.9%).
Last matches: D V V V V
Level, 1 wins each over 2 singles meetings since 2024.
On 01/06/2025, at Lexus Birmingham Open - Birmingham (Qualifiers): Sayaka Ishii won 6-3 6-7(3) 3-6.