Baseball is the sport played by Alex Rodriguez.
Alex Rodriguez . He played 22 seasons in Major League Baseball ( MLB ) for the Seattle Mariners , Texas Rangers , and New York Yankees . The First-Year Player Draft , also known as the Rule 4 Draft , is Major League Baseball 's ( MLB ) primary mechanism for assigning amateur baseball players from high schools , colleges , and other amateur baseball clubs to its teams . Major League Baseball ( MLB ) is a professional baseball organization , the oldest of the four major professional sports leagues in the United States and Canada . A third baseman , abbreviated 3B , is the player in baseball whose responsibility is to defend the area nearest to third base -- the third of four bases a baserunner must touch in succession to score a run .