The Association of Tennis Professionals (ATP) is the most important organization for men's professional tennis, meaning men who play tennis for their job instead of just for fun. It was started in September 1972 by Donald Dell, Jack Kramer, and Cliff Drysdale. Its job is to care for the interests of men's professional tennis. Starting in 1990, the ATP has organized the most important group of tennis competitions for men. In 2009, the organization changed the name of the competitions from "ATP Tour" to "ATP World Tour." It is based in London.
- Rankings as of 28 July 2014.