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 Jose Theodore for ; and Carey Price for . Two other Vezina-winning goaltenders have also won the Hart Memorial Trophy: Roy Worters and Al Rollins. Chuck Rayner was the only goaltender to win the Hart Memorial Trophy, but never the Vezina. When introduced, the Vezina Trophy was awarded to the top goaltender in the league. Several winners, including Hainsworth in 1927 and Gardiner in 1934, did not have the lowest goals-against average. In 1946, the NHL Governors further clarified the criteria for winning. It was to go to the team with the fewest goals scored against it during the season.