Roger Federer and Novak Djokovic hold the record for the most singles titles with six, while Peter Fleming and John McEnroe jointly hold the record for the most doubles titles with seven. The tournament was first held in 1970, although it was then known by a different name. The top two players from each group after the round-robin stage move on to the semifinals, followed by a final to determine the champion. The tournament uses a unique format not seen in other ATP Tour events: The players are separated into two groups of four, within which they each play three round-robin matches. The tournament is sometimes referred to as a 'fifth Grand Slam,' due to the prestige that comes with qualifying for and winning the event.
The eighth spot is reserved, if needed, for a player or team who won a major in the current year and are ranked from 8th–20th. It is the most significant event in the annual ATP calendar after the four majors as it features the top-eight singles players and top-eight doubles teams based on their results throughout the season. The ATP Finals is the season-ending championship of the ATP Tour.
