The eighth spot is reserved, if needed, for a player or team who won a major in the current year and is ranked from ninth to twentieth.

The tournament uses a unique format not seen in other ATP Tour events, where the singles players and doubles teams are separated into two groups of four, within which they each play three round-robin matches.

After the round-robin stage, the top two performers from each group play in knock-out semifinals and a final to determine the champion(s).

In the tournament's current format, the champion can earn a maximum of 1,500 ranking points, if they win the event after going undefeated in the round-robin stage.

By winning the 2024 title, Sinner earned a record $4,881,100, the highest payout for a tournament winner in tennis.

[1] In 2022, Rajeev Ram and Joe Salisbury claimed $930,300, the highest payout in doubles history.

[3] It was organised by the International Lawn Tennis Federation (ILTF) and ran alongside the competing WCT Finals from 1971 to 1989.

The Masters was a year-end showpiece event between the best players on the men's tour, but did not count for any world ranking points.

In 2009, the championship was renamed the "ATP World Tour Finals" and was held at The O2 Arena in London.

Instead of line umpires, the system detects the relevant movements of the player and where the ball bounces on court.

[20] In September 2020, Nitto Denko announced it will extend its title partnership of the ATP Finals for another five years, until 2025.

ATP Finals is the men's premier indoor event of the season, only in three editions it was played outdoors; 1974, 2003 and 2004.