2019 Rakuten Japan Open Tennis Championships – Singles

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.

Seeds
• #🇷🇸 Novak Djokovic (champion)

• # Borna Ćorić (first round)

• #🇧🇪 David Goffin (semifinals)

• #🇫🇷 Benoît Paire (first round)

• #🇫🇷 Lucas Pouille (quarterfinals)

• # Marin Čilić (second round)

• #🇺🇸 Taylor Fritz (first round)

• #🇦🇺 Alex de Minaur (first round)

Seeds
• # 🇪🇸 Pablo Andújar (qualified)

• # Nicolás Jarry (first round)

• # 🇦🇺 John Millman (qualified)

• # 🇮🇹 Thomas Fabbiano (first round)

• # 🇦🇺 Alexei Popyrin (qualified)

• # 🇰🇷 Kwon Soon-woo (qualifying competition)

• # 🇩🇪 Peter Gojowczyk (first round)

• # 🇺🇸 Steve Johnson (first round)

Qualifiers
• # 🇪🇸 Pablo Andújar

• # 🇯🇵 Yasutaka Uchiyama

• # 🇦🇺 John Millman

• # 🇦🇺 Alexei Popyrin