McCain's greatest victories were over Raúl Ramírez at the 1981 Queens Club tournament, Wojtek Fibak, then world No.

The following year, he would do the same at the 1981 US Open, defeating Bill Cowan of Canada, and falling again to Tim Mayotte of the United States in five sets in the second round.

As with his singles career McCain's best doubles performances came in 1984, when he reached the finals at Melbourne and Sydney Outdoors.

He and Gullikson finally fell to Paul Annacone of the US and Christo van Rensburg of the Republic of South Africa.

Here they stormed the rankings once again, only to fall in a three-set loss to Broderick Dyke and Wally Masur, both of Australia, in the finals.