Australia defeated Cuba in the North/Central America Zone, and then received a walkover from Brazil (the only team in the South America Zone) in the Americas Inter-Zonal playoff.
The USA defeated Sweden in the Inter-Zonal play-off, and then defeated defending champions Australia in the Challenge Round.
Canada did not progress beyond the America Zone Final stage during Main's time, losing either to the United States or Australia in that round.
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India then fell to defending champions Australia in the Challenge Round which was the 1966 Davis Cup finals.