The perfect game is one of the rarest accomplishments in sports. No hits, no walks, no men reaching base. In nearly four hundred thousand contests in more than 130 years of Major League Baseball, it has only happened twenty times. On June 2, 2010, Armando Galarraga threw baseball's twenty-first perfect game. Except that's not how it entered the record books. That's because Jim Joyce, a veteran umpire with more than twenty years of big league experience,...