2015 Rakuten Japan Open Tennis Championships

The 2015 Rakuten Japan Open Tennis Championships was a men's tennis tournament played on outdoor hard courts. It was the 42nd edition of the Japan Open, and part of the 500 Series of the 2015 ATP World Tour. It was held at the Ariake Coliseum in Tokyo, Japan, from October 5–11, 2015.

Seeds

 * 1 Rankings are as of September 28, 2015.

Other entrants
The following players received wildcards into the singles main draw:
 * 🇯🇵 Tatsuma Ito
 * 🇯🇵 Yoshihito Nishioka
 * 🇯🇵 Yasutaka Uchiyama

The following players received entry from the qualifying draw:
 * 🇦🇺 Matthew Ebden
 * 🇺🇸 Austin Krajicek
 * 🇺🇸 Donald Young
 * 🇷🇺 Mikhail Youzhny

Withdrawals

 * Before the tournament
 * 🇪🇸 Pablo Andújar →replaced by Sam Groth
 * Ernests Gulbis →replaced by Marcos Baghdatis
 * 🇫🇷 Gaël Monfils →replaced by Albert Ramos Viñolas

Retirements

 * 🇦🇺 Sam Groth (foot injury)
 * 🇦🇺 Bernard Tomic (illness)

Seeds

 * Rankings are as of September 28, 2015

Other entrants
The following pairs received wildcards into the doubles main draw:
 * 🇺🇸 Austin Krajicek / 🇯🇵 Yasutaka Uchiyama
 * 🇯🇵 Toshihide Matsui / 🇫🇮 Jarkko Nieminen

The following pair received entry from the qualifying draw:
 * 🇺🇸 Steve Johnson / 🇺🇸 Sam Querrey

The following pair received entry as lucky losers:
 * 🇩🇪 Andre Begemann / 🇳🇿 Artem Sitak

Withdrawals

 * Before the tournament
 * Kevin Anderson (right knee injury)

Singles

 * Stan Wawrinka defeated 🇫🇷 Benoît Paire, 6–2, 6–4

Doubles

 * Raven Klaasen / 🇧🇷 Marcelo Melo defeated 🇨🇴 Juan Sebastián Cabal / 🇨🇴 Robert Farah, 7–6(7–5), 3–6, [10–7]