As the World Series shifts to Busch Stadium, playing from the comforts of their home ballpark presents more than just a friendly crowd and a familiar setting for the Cardinals. The change of venue also accompanies a change of rules, as the designated hitter vanishes in the National League park, forcing the Red Sox to move one of their better hitters — either Mike Napoli or David Ortiz — to the bench for Games 3, 4 and 5.