2018 Rakuten Japan Open Tennis Championships – Singles
| Singles | |
|---|---|
| 2018 Rakuten Japan Open Tennis Championships | |
| Champion | Daniil Medvedev |
| Runner-up | Kei Nishikori |
| Score | 6–2, 6–4 |
| Draw | 32 (4Q / 3WC) |
| Seeds | 8 |
David Goffin was the defending champion, but withdrew before the competition began.
Daniil Medvedev won the title, defeating Kei Nishikori in the final, 6–2, 6–4.