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Madison Bumgarner's slam was historic, but Buster Posey's was the hit the Giants have yearned for while shut out in five of the last 13 games.
In a bit of a surprising personnel move, Bruce Bochy decided to shake up the pitching rotation, pushing his most rested arm to the fifth slot.
The Giants wrap up their homestand with a win against Arizona thanks to a pair of grand slams from Madison Bumgarner and Buster Posey.