Portal:Baseball/Selected article/Week 18, 2007

Major League Baseball (MLB) is the highest level of play in professional baseball. More specifically, Major League Baseball refers to the organization that operates North American professional baseball's two leagues, the National League and the American League, by means of a joint organizational structure which has existed between them since 1903. The American League operates under the Designated Hitter Rule, but the National League does not ('inter-league' game rules are determined by the home team's league). In 2000, the American and National leagues were officially disbanded as separate legal entities with all rights and functions consolidated in the commissioner's office. MLB effectively operates as a single league and as such it constitutes one of the major professional sports leagues of North America.