2023-10-16 Tokyo

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

On 1 March 2022, the ATP, WTA, ITF and the four grand slam tournaments announced as a result of the Russian war in Ukraine, Belarus and Russia would not be allowed to play in tournaments under the names or flags of their countries. The tennis players are able to compete in tournaments but not under the Russian or Belarusian flags.

Singles

 * Seeds
 * Draw

Doubles

 * Seeds
 * Draw