New York Yankees, Boston Red Sox, Chicago White Sox, Milwaukee Brewers, Toronto Blue Jays, and the Seattle Mariners. None of those no-hitters which the team allowed at least a run. The most baserunners allowed in a no-hitter were by Trucks (his first no-hitter in 1952) and Morris (in 1984), who each allowed six. Of the seven no-hitters, two have been won by a score of 1–0 and two by the score of 4–0, more common than any other results. The largest margin of victory in a no-hitter was a 9–0 win by Verlander in 2011. The smallest margin of victory was two 1–0 wins by Trucks both in 1952. The umpire is also an integral part of any no-hitter. The task of the umpire in a baseball game is to make any decision "which involves judgment, such as, but not limited to, whether a batted ball is fair or foul, whether a pitch is a strike or a ball, or whether a runner is safe or out… [the umpire's judgment on such matters] is final." Part of the duties of the umpire making calls at home plate includes defining the strike zone, which is defined as the "area over home plate the upper limit of which is a horizontal line at the midpoint between the top of the shoulders and the top of the uniform pants, and the lower level is a line at the hollow beneath the kneecap." These calls define every baseball game and are therefore integral to the completion of any no-hitter. A different umpire presided over each of the Tigers' eight no-hitters. The manager is another integral part of any no-hitter. The tasks of the manager include determining the starting rotation as well as batting order and defensive lineup every game. Managers choosing the right pitcher and right defensive lineup at a right game at a right place at a right time would lead to a no-hitter. Jim Leyland is the only Tigers manager to skipper more than one no-hitter, being at the helm for both of Verlander's. No-hitters See also Armando Galarraga's near-perfect game List of Major League Baseball no-hitters References No-hitters Lists of Major League Baseball no-hitters by franchise