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Watch: You may not see a more joyful celebration than Bryce Harper's mad sprint around the bases

PHILADELPHIA — Bryce Harper knows everyone in the dugout and ballpark expects him to get clutch hits in moments just like this.

Boy, he crushed it.

Harper blasted a grand slam with one out in the ninth inning, capping a six-run rally that sent the Philadelphia Phillies over the Chicago Cubs 7-5 Thursday night for a three-game sweep.

Harper delivered his biggest hit yet in his first season after signing a $330 million, 13-year contract with the Phillies, celebrating while running around the bases and then getting mobbed by teammates at the plate.

"Before I went to the plate, I touched my heart and I was thinking to myself: Why am I not jittery?