2017 Rakuten Japan Open Tennis Championships – Singles

Nick Kyrgios was the defending champion, but chose to compete in Beijing instead.

David Goffin won the title, defeating Adrian Mannarino in the final, 6–3, 7–5.

Seeds
• # Marin Čilić (semifinals)

• #🇦🇹 Dominic Thiem (first round)

• #🇨🇦 Milos Raonic (second round, retired)

• #🇧🇪 David Goffin (champion)

• # Kevin Anderson (second round)

• #🇺🇸 Sam Querrey (first round)

• #🇪🇸 Albert Ramos Viñolas (first round)

• #🇦🇷 Diego Schwartzman (semifinals)

Seeds
• # 🇺🇸 Frances Tiafoe (qualifying competition)

• # 🇨🇦 Vasek Pospisil (qualifying competition)

• # 🇦🇷 Nicolás Kicker (first round)

• # 🇲🇩 Radu Albot (qualifying competition)

• # Nicolás Jarry (first round)

• # Stefanos Tsitsipas (qualified)

• # 🇪🇸 Adrián Menéndez-Maceiras (first round)

• # 🇩🇪 Yannick Hanfmann (qualifying competition)

Qualifiers
• # Stefanos Tsitsipas

• # 🇯🇵 Yusuke Takahashi

• # 🇦🇺 Matthew Ebden

• # Franko Škugor