World Championship Tennis

World Championship Tennis (WCT) was one of the principal organizing bodies of men's professional tennis headquartered at the WCT Lakeway World of Tennis facility, Austin, Texas, United States from 1968 to 1989. It administered the WCT Circuit a worldwide tour of associated tennis tournaments that was a rival tour to the ITF Grand Prix Circuit both of which were replaced by the Association of Tennis Professionals ATP Tour in 1990.

Source: Wikipedia — World Championship Tennis (CC BY-SA 4.0)