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.[1]
See main article: 2023 Japan Open Tennis Championships – Singles.
Ben Shelton def. Aslan Karatsev, 7–5, 6–1See main article: 2023 Japan Open Tennis Championships – Doubles.
Rinky Hijikata / Max Purcell def. 
Jamie Murray / 
Michael Venus, 6–4, 6–1| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
| Taylor Fritz | 8 | 1 | ||
| Casper Ruud | 9 | 2 | ||
| Alexander Zverev | 10 | 3 | ||
| Alex de Minaur | 11 | 4 | ||
| Tommy Paul | 12 | 5 | ||
| Frances Tiafoe | 13 | 6 | ||
| Karen Khachanov | 14 | 7 | ||
| Félix Auger-Aliassime | 15 | 8 |
The following players received wildcards into the singles main draw:
The following players received entry from the qualifying draw:
Andy Murray → replaced by 
Sebastian Ofner
Kei Nishikori → replaced by 
Zhang Zhizhen
Milos Raonic → replaced by Christopher O'Connell| Country | Player | Country | Player | Rank1 | Seed | |
|---|---|---|---|---|---|---|
 India | Australia | |||||
 Spain |  Argentina | |||||
| Marcelo Arévalo | Jean-Julien Rojer | 33 | 3 | |||
 Belgium | Sander Gillé | Belgium | Joran Vliegen | 37 | 4 |
The following pairs received wildcards into the doubles main draw:
The following pair received entry from the qualifying draw:
The following pairs received entry as lucky losers:
Rohan Bopanna / Matthew Ebden → replaced by Kaichi Uchida / Yasutaka Uchiyama Marcel Granollers / Horacio Zeballos → replaced by Shintaro Mochizuki / Rio Noguchi
Jan Zieliński → replaced by Ben McLachlan / Yoshihito Nishioka