See main article: 2014 Rakuten Japan Open Tennis Championships.
Juan Martín del Potro was the defending champion, but withdrew with a wrist injury.
Kei Nishikori won the title, defeating Milos Raonic in the final, 7–6(7–5), 4–6, 6–4.
See also: 1. Stan Wawrinka (first round)
See also: 2. David Ferrer (first round)
See also: 3. Milos Raonic (final)
See also: 4. Kei Nishikori (champion)
See also: 5. Jo-Wilfried Tsonga (first round)
See also: 6. Roberto Bautista Agut (first round, retired)
See also: 7. Kevin Anderson (second round)
See also: 8. Alexandr Dolgopolov (first round)
See also: 1. James Ward (qualifying competition, retired)
See also: 2. Pierre-Hugues Herbert (qualified)
See also: 3. James Duckworth (qualifying competition)
See also: 4. Michał Przysiężny (qualified)
See also: 5. Rajeev Ram (qualified)
See also: 6. Hiroki Moriya (qualified)
See also: 7. Thanasi Kokkinakis (qualifying competition)
See also: 8. Yasutaka Uchiyama (qualifying competition)