When he was playing for the Brewers, infielder Scooter Gennett could hit the long ball every so often — just nothing like this. He “went yard” four times in a 13-1 rout of the St. Louis Cardinals Tuesday night.  Gennett had been in an oh-for-19 slump when he doubled in the game-winning runs Monday.  Tuesday he went five-for-five, with those four home runs and 10 runs batted in.  Gennett is only the 17th player in Major League Baseball history to pop four home runs in one game.  The last to do it was Texas Rangers outfielder Josh Hamilton five years ago this month.