The Association of Tennis Professionals (ATP) World Tour is the elite professional tennis circuit organized by the ATP. The 2010 ATP World Tour calendar comprises the Grand Slam tournaments, the ATP World Tour Masters 1000, the ATP World Tour 500 series, the ATP World Tour 250 series, the ATP World Team Championship, the Davis Cup, and the ATP World Tour Finals. Also included in the 2010 calendar is the Hopman Cup, which does not distribute ranking points, and is organized by the ITF.