2023 Japan Open Tennis Championships

The 2023 Japan Open Tennis Championships (also known as the Kinoshita Group Japan Open Tennis Championships for sponsorship reasons) was a men's tennis tournament played on outdoor hard courts. It was the 48th edition of the Japan Open, and was part of the ATP Tour 500 series of the 2023 ATP Tour. It was held at the Ariake Coliseum in Tokyo, Japan, from 16 to 22 October 2023.

Singles

 * 🇺🇸 Ben Shelton def. Aslan Karatsev, 7–5, 6–1

Doubles

 * 🇦🇺 Rinky Hijikata / 🇦🇺 Max Purcell def. 🇬🇧 Jamie Murray / 🇳🇿 Michael Venus, 6–4, 6–1

Seeds

 * 1 Rankings are as of 2 October 2023.

Other entrants
The following players received wildcards into the singles main draw:
 * 🇯🇵 Shintaro Mochizuki
 * 🇯🇵 Sho Shimabukuro
 * 🇯🇵 Yosuke Watanuki

The following players received entry from the qualifying draw:
 * 🇯🇵 Taro Daniel
 * 🇬🇧 Jack Draper
 * Cristian Garín
 * 🇺🇸 Marcos Giron

Withdrawals

 * 🇬🇧 Andy Murray → replaced by 🇦🇹 Sebastian Ofner
 * 🇯🇵 Kei Nishikori → replaced by 🇨🇳 Zhang Zhizhen
 * 🇨🇦 Milos Raonic → replaced by 🇦🇺 Christopher O'Connell

Seeds

 * Rankings are as of 2 October 2023.

Other entrants
The following pairs received wildcards into the doubles main draw:
 * 🇯🇵 Toshihide Matsui / 🇯🇵 Kaito Uesugi
 * 🇯🇵 Sho Shimabukuro / 🇯🇵 Yosuke Watanuki

The following pair received entry from the qualifying draw:
 * 🇯🇵 Taisei Ichikawa / 🇯🇵 Masamichi Imamura

The following pairs received entry as lucky losers:
 * 🇯🇵 Shintaro Mochizuki / 🇯🇵 Rio Noguchi
 * 🇯🇵 Kaichi Uchida / 🇯🇵 Yasutaka Uchiyama

Withdrawals

 * 🇮🇳 Rohan Bopanna / 🇦🇺 Matthew Ebden → replaced by 🇯🇵 Kaichi Uchida / 🇯🇵 Yasutaka Uchiyama
 * 🇪🇸 Marcel Granollers / 🇦🇷 Horacio Zeballos → replaced by 🇯🇵 Shintaro Mochizuki / 🇯🇵 Rio Noguchi
 * Hugo Nys / 🇵🇱 Jan Zieliński → replaced by 🇯🇵 Ben McLachlan / 🇯🇵 Yoshihito Nishioka