2012 Rakuten Japan Open Tennis Championships – Singles

Andy Murray was the defending champion, but lost to Milos Raonic in the semifinals. Eighth-seeded Kei Nishikori won the title beating Milos Raonic in the final 7–6(7–5), 3–6, 6–0, and in doing so became the first home grown winner of the title since Toshiro Sakai in 1972.

Seeds
• # 🇬🇧 Andy Murray (semifinals)

• # 🇨🇿 Tomáš Berdych (quarterfinals)

• # 🇷🇸 Janko Tipsarević (quarterfinals)

• # 🇦🇷 Juan Mónaco (second round)

• # 🇪🇸 Nicolás Almagro (first round)

• # 🇨🇦 Milos Raonic (final)

• # Stanislas Wawrinka (quarterfinals)

• # 🇯🇵 Kei Nishikori (champion)

Seeds
• # 🇧🇬 Grigor Dimitrov (qualified)

• # Ivo Karlović (qualifying competition, lucky loser)

• # 🇺🇦 Sergiy Stakhovsky (qualified)

• # 🇷🇺 Dmitry Tursunov (qualified)

• # 🇩🇪 Philipp Petzschner (qualifying competition)

• # 🇨🇦 Vasek Pospisil (qualifying competition)

• # Marco Chiudinelli (qualified)

• # 🇷🇸 Dušan Lajović (qualifying competition)

Qualifiers
• # 🇧🇬 Grigor Dimitrov

• # Marco Chiudinelli

• # 🇺🇦 Sergiy Stakhovsky

• # 🇷🇺 Dmitry Tursunov

Lucky loser

 * 1)  Ivo Karlović