2019 Rakuten Japan Open Tennis Championships – Singles
| Singles | |
|---|---|
| 2019 Rakuten Japan Open Tennis Championships | |
| Champion | Novak Djokovic |
| Runner-up | John Millman |
| Score | 6–3, 6–2 |
| Draw | 32 (4Q / 3WC) |
| Seeds | 8 |
Novak Djokovic defeated John Millman in the final, 6–3, 6–2 to win the 2019 Japan Open.
Daniil Medvedev was the reigning champion, but did not defend his title.