2016 Rakuten Japan Open Tennis Championships – Singles

Stan Wawrinka was the defending champion, but withdrew before the tournament began.

Nick Kyrgios won the title, defeating David Goffin in the final, 4−6, 6−3, 7−5. This was his first ATP 500 level title.

Seeds
• #🇯🇵 Kei Nishikori (second round, retired)

• #🇫🇷 Gaël Monfils (semifinals)

• #🇨🇿 Tomáš Berdych (first round)

• # Marin Čilić (semifinals)

• #🇧🇪 David Goffin (final)

• #🇦🇺 Nick Kyrgios (champion)

• # Ivo Karlović (quarterfinals)

• #🇪🇸 Feliciano López (first round, retired)

Seeds
• # 🇷🇺 Mikhail Youzhny (first round)

• # 🇬🇧 Daniel Evans (first round)

• # Gastão Elias (first round)

• # 🇺🇸 Donald Young (qualifying competition, Lucky loser)

• # 🇺🇸 Jared Donaldson (first round)

• # 🇨🇿 Radek Štěpánek (qualified)

• # 🇨🇦 Vasek Pospisil (qualifying competition, retired)

• # 🇺🇸 Ryan Harrison (qualified)

Qualifiers
• # 🇦🇺 James Duckworth

• # 🇨🇿 Radek Štěpánek

• # 🇯🇵 Go Soeda

• # 🇺🇸 Ryan Harrison

Lucky losers
• # 🇺🇸 Donald Young