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Video: Watch Phillies' Bryce Harper Crush Walk-off Grand Slam to Stun Cubs

Bryce Harper has his first signature moment with the Philadelphia Phillies.

Down two runs to the Chicago Cubs in the ninth inning, the superstar launched a walk-off grand slam that still might not have landed:

NBC Sports Philadelphia

BRYCE-GRAND-FREAKIN'-SLAMMIN-HARPER. https://t.co/qFFcqtoYV3

It was the first walk-off grand slam for the Phillies while trailing since Ozzie Virgil in 1983, per Sarah Langs of MLB.com.

Philadelphia trailed by five runs going into the eighth and was down 5-1 in the ninth, but the squad came through with a six-run inning off Rowan Wick, Pedro Strop and Derek Holland to seal the 7-5 victory and a three-game sweep of the Cubs.