2025 Japan Open Tennis Championships – Singles
| Singles | |
|---|---|
| 2025 Japan Open Tennis Championships | |
| Champion | Carlos Alcaraz |
| Runner-up | Taylor Fritz |
| Score | 6–4, 6–4 |
| Draw | 32 (4Q / 3WC) |
| Seeds | 8 |
Carlos Alcaraz defeated Taylor Fritz in the final, 6–4, 6–4 to win the singles tennis title at the 2025 Japan Open. It was his 24th career ATP Tour title.
Arthur Fils was the reigning champion, but did not participate this year due to a back injury.