In a nod to new technology, Major League Baseball will tweak its postseason tradition and add a seventh umpire to rotate between the replay booth and field for the World Series and league championship series.Second base umpirer Eric Cooper checks on a replay during the seventh inning of a baseball game between the San Francisco Giants and the San Diego Padres in San Francisco, Sunday, Sept. 28, 2014. The Giants won 9-3.Colorado Rockies' Wilin Rosario, right, hits a solo home run as Los Angeles Dodgers relief pitcher Daniel Coulombe, left, looks on along with catcher Drew Butera, second from left, and home plate umpire Mike Estabrook during the eighth inning of a baseball game, Sunday, Sept. 28, 2014, in Los Angeles.