Major professional sports leagues in the United States and Canada to compete, with the provision that the Stanley Cup winners were to be recognized as "World's Champions". The phrase was repeatedly engraved on the Cup, and continued to be used, when the NHL began admitting American franchises. When the NHL assumed formal control of the Cup in 1947, the resulting agreement required "that the winners of this trophy shall be the acknowledged World's Professional Hockey Champions" (in contrast to the IIHF's Ice Hockey World Championships, at the time contested only by amateurs). When the World Hockey Association commenced play in the 1970s, they sought to challenge for the Stanley Cup,
Vezina Trophy GAA not to be a member of the team that allowed the fewest goals. The Vezina continued to be awarded to the goaltender who started the most games for the team that allowed the fewest goals, but the Vezina winners of , , and did not have the lowest GAAs. The National Hockey League began allowing teammates to split the Vezina Trophy following the 1964–65 NHL season. The Toronto Maple Leafs allowed 173 goals against, barely beating out Montreal's 175 goals against and Chicago's 176 goals against. Terry Sawchuk played 36 games for the Leafs with a GAA of 2.56,