2011 Rakuten Japan Open Tennis Championships – Singles

Rafael Nadal was the defending champion, but lost in the final to second-seeded Andy Murray, 3–6, 6–2, 6–0.

Seeds
• # 🇪🇸 Rafael Nadal (final)

• # 🇬🇧 Andy Murray (champion)

• # 🇪🇸 David Ferrer (semifinals)

• # 🇺🇸 Mardy Fish (semifinals)

• # 🇷🇸 Viktor Troicki (first round)

• # 🇷🇸 Janko Tipsarević (first round)

• # 🇨🇿 Radek Štěpánek (quarterfinals)

• # 🇦🇷 Juan Mónaco (first round)