High Quality Content by WIKIPEDIA articles! The Association of Tennis Professionals (ATP) Tour is the elite professional tennis circuit organised by the ATP. The 1999 ATP Tour calendar comprises the Grand Slam tournaments (supervised by the International Tennis Federation (ITF)), the ATP Super 9, the ATP International Series Gold, the ATP International Series, the ATP World Team Cup, the ATP Tour World Championships and the Grand Slam Cup (organised by the ITF). Also included in the 1999 calendar are the Davis Cup and the Hopman Cup, which do not distribute ranking points, and are both organised by the ITF.