Davis Cup by Rakuten is the men’s World Cup of Tennis. Having been founded in 1900, it is the longest-running and largest annual international team event in sport, with 137 nations competing in 2022. This season, 807 players have been nominated to represent their nations (with 630 players contesting at least one match at the time of writing).
https://www.daviscup.com/en/news/327643.aspx