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Major League Baseball (MLB) Major League Baseball (MLB) is the highest level of play in North American professional baseball. More specifically, Major League Baseball refers to the organization that operates North American professional baseball's two major leagues, the National League and the American League, by means of a joint organizational structure which has existed between them since 1903. Major League Baseball teams play a 162-game season. The two leagues follow the same rules, with one exception: the American League operates under the Designated Hitter Rule, while the National League does not. Utilisation of the DH Rule in Interleague, All-Star and World Series games is determined by the home team's league rules. 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.
Arizona Diamondbacks, Atlanta Braves, Baltimore Orioles, Boston Red Sox, Chicago Cubs, Chicago White Sox, Cincinnati Reds, Cleveland Indians, Colorado Rockies, Detroit Tigers, Florida Marlins, Houston Astro, Kansas City Royals, Los Angeles Angels of Anaheim, Los Angeles Dodgers, Milwaukee Brewers, Minnesota Twins, New York Mets, New York Yankees, Oakland Athletics, Philadelphia Phillies, Pittsburgh Pirates, San Diego Padres, San Francisco Giants, Seattle Mariners, St. Louis Cardinals, Tampa Bay Rays, Texas Rangers, Toronto Blue Jays, Washington Nationals