It was organized by World Championship Tennis (WCT).

The 1975 circuit divided the players in three groups, Red, Blue and Green who played 24 tournaments in 12 countries.

The first tournament, U.S. Professional Indoor Championships, was a combined event as was the season's final which was played in Dallas by the eight best performers and was won by American Arthur Ashe who defeated Björn Borg from Sweden in four sets.

[1] Additionally there were three special non–ranking events; the CBS Classic (Puerto Rico, 13–19 January), the Aetna World Cup team contest between Australia and America (Hartford, 6–9 March) and the Rothmans International Trophy an eight-nation contest between 16 players (London, 4–8 March).

[1] This is the complete schedule of events on the 1975 WCT circuit, with player progression documented until the quarterfinals stage.