ATP rankings – Wikipedia

The ATP Race is an annual points race to determine the year-end No. 1 singles player and doubles team in the ATP rankings system used by the ATP. The race, initially called the “ATP Champions Race”, was introduced by the ATP for the 2000 season as part of their “21st Century Tennis” strategy announced in 1999. All players and teams start the year with zero points, and accumulate points from …

https://en.wikipedia.org/wiki/ATP_rankings