Major League Baseball

The MLB is the highest level a player can reach in professional baseball. More specifically, MLB refers to the organization that operates North American professional baseball's two major leagues, the National League and the American... [more]

The MLB is the highest level a player can reach in professional baseball. More specifically, MLB refers to the organization that operates North American professional baseball's two major leagues, the National League and the American League. On an organizational level, MLB effectively operates as a single "league," and as such it constitutes one of the major professional sports leagues in North America. See more Major League Baseball articles and pictures here.