2017 Rakuten Japan Open Tennis Championships

The 2017 Rakuten Japan Open Tennis Championships was a men's tennis tournament played on outdoor hard courts. It was the 44th edition of the Japan Open, and part of the 500 Series of the 2017 ATP World Tour. It was held at the Ariake Coliseum in Tokyo, Japan, from October 2–8, 2017.

Seeds

 * 1 Rankings are as of September 25, 2017.

Other entrants
The following players received wildcards into the singles main draw:
 * 🇯🇵 Taro Daniel
 * 🇯🇵 Go Soeda
 * 🇯🇵 Yasutaka Uchiyama

The following player received entry as a special exempt:
 * 🇺🇦 Alexandr Dolgopolov

The following players received entry from the qualifying draw:
 * 🇦🇺 Matthew Ebden
 * Franko Škugor
 * 🇯🇵 Yusuke Takahashi
 * Stefanos Tsitsipas

Withdrawals

 * Before the tournament
 * 🇰🇷 Chung Hyeon →replaced by 🇺🇸 Donald Young
 * 🇫🇷 Gaël Monfils →replaced by 🇨🇿 Jiří Veselý
 * 🇱🇺 Gilles Müller →replaced by 🇷🇺 Daniil Medvedev

Retirements

 * 🇨🇦 Milos Raonic
 * 🇫🇷 Benoît Paire

Seeds

 * Rankings are as of September 25, 2017

Other entrants
The following pairs received wildcards into the doubles main draw:
 * 🇯🇵 Toshihide Matsui / 🇯🇵 Yūichi Sugita
 * 🇯🇵 Ben McLachlan / 🇯🇵 Yasutaka Uchiyama

The following pair received entry from the qualifying draw:
 * Treat Huey / 🇨🇦 Adil Shamasdin

Singles

 * 🇧🇪 David Goffin defeated 🇫🇷 Adrian Mannarino, 6–3, 7–5

Doubles

 * 🇯🇵 Ben McLachlan / 🇯🇵 Yasutaka Uchiyama defeated 🇬🇧 Jamie Murray / 🇧🇷 Bruno Soares, 6–4, 7–6(7–1)