2025 Japan Women's Open – Singles
| Singles | |
|---|---|
| 2025 Japan Women's Open | |
| Champion | Leylah Fernandez |
| Runner-up | Tereza Valentová |
| Score | 6–0, 5–7, 6–3 |
| Draw | 32 (6 Q / 4 WC) |
| Seeds | 8 |
Leylah Fernandez defeated Tereza Valentová in the final, 6–0, 5–7, 6–3 to win the singles title at the 2025 Japan Women's Open. It was her fifth WTA Tour singles title.
Suzan Lamens was the defending champion, but lost in the second round to Naomi Osaka.