2019 Rakuten Japan Open Tennis Championships – Singles
Daniil Medvedev was the defending champion, but chose not to defend his title.

Novak Djokovic won the title, defeating qualifier John Millman in the final, 6–3, 6–2.

Seeds

Draw

Finals

Top half

Bottom half

Qualifying

Seeds

Qualifiers

Qualifying draw

First qualifier

Second qualifier

Third qualifier

Fourth qualifier