Ivan Lendl (3)
| 1 January 1983 – 1 May 1983|
John McEnroe (2)
1983 World Championship Tennis circuit Wikipedia
The 1983 World Championship Tennis circuit was one of the two rival professional male tennis circuits of 1983. It was organized by World Championship Tennis (WCT). The WCT circuit withdrew from the Grand Prix circuit in 1982 and established its own full calendar season consisting of 20 tournaments. For the 1983 season the WCT circuit was downsized to eight tournaments and ran from January to May.