Fun Fact: The Only Inside-the-Park Walk-Off Grand Slam in MLB History! On July 25, 1956, Roberto Clemente of the Pittsburgh Pirates did something no other MLB player has ever done—he hit a walk-off, inside-the-park grand slam! With the bases loaded in the bottom of the 9th, Clemente smashed a ball off the outfield wall. Instead of stopping at third, he kept running full speed and slid home safely, giving the Pirates a dramatic 9-8 victory. Would you rather hit a towering home run or race around the bases for an inside-the-park one? ⚾💨 #FunFact #BaseballHistory #FlipFam #baseball