Giants’ Williamson does it again — homer beats Nationals

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If you're name is Mac Williamson and you want to give your team and a stadium full of fans the tremors, just run full-speed toward a Bryce Harper foul ball, trip over the bullpen mound, slam head-first into a wall and stay on the ground for a spell.

If you want to let everyone know you're OK, come to the plate an inning later, swing at the first pitch and send a ball 423 feet onto the netting above the kale garden in center field.

Williamson homered for the third time in five games since his promotion Tuesday night, with two outs in the sixth inning, breaking a tie and delivering a 4-3…