Backstop Buster Posey and southpaw Madison Bumgarner become the first batterymates in major league history to hit grand slams in the same game when they both go deep in the Giants’ 8-4 victory over the Diamondbacks at AT&T Park. The left-hander’s four-run round-tripper marks only the second time that a hurler has hit two in a season, a feat also accomplished by Tony Cloninger, who hit both his grand salamis in the same game in 1966.

On July 13, 2014 — Backstop Buster Posey and southpaw Madison Bumgarner become the first batterymates in major league history to hit grand slams in the same game when they both go deep in the Giants’ 8-4 victory over the Diamondbacks at AT&T Park. The left-hander’s four-run round-tripper marks only the second time that a hurler has hit two in a season, a feat also accomplished by Tony Cloninger, who hit both his grand salamis in the same game in 1966.

Sources:
National Pastime January 28

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