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The right-hander allowed three hits through the first four innings, then fell apart in the fifth. Crawford had an RBI triple and scored on rookie shortstop Zack Cozart’s error. A four-pitch walk and a single loaded the bases for Posey.

As soon as he connected, Reds catcher Ryan Hanigan stood and turned away, unable to watch the ball head for the seats.

Cincinnati’s 17-year history of playoff futility was about to go on.

NOTES: Posey’s other career grand slam came on July 7, 2010 at Milwaukee. … The Reds are 3-3 in winner-take-all playoff games, including 1-2 in best-of-five series and 2-1 in best-of-seven series. .. Teams that lose the first two games in a best-of-five series are 7-59 all-time. … Cain gave up six hits and three runs in 6 2-3 innings, the longest appearance by a Giants starter during the series.