When the American League expanded to 10 teams in the 1961 season their schedule was lengthened to 162 games. When the National League expanded to 10 teams in the 1962 season their schedule was lengthened to 162 games.
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The American League switched in 1961 when they expanded from 8 to 10 teams and the National League switched in 1962 when they expanded from 8 to 10 teams.