Bumgarner, Posey first battery-mates to hit grand slams in same game

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So during the course of Sunday's Diamondbacks-Giants game (SF 8, ARI 4), Giants catcher Buster Posey hit a grand slam. That's notable, as grand slams, by definition, tend to be. The very next inning, though, Giants starter Madison Bumgarner decided that seemed like a cool thing to do ... 

Yes, that's a grand slam by each member of the starting battery in the same game. And now for implications of what you've just witnessed ... 

Everything has happened before in baseball, except for those things that have never happened. 

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