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ATLANTA --  Atlanta Braves  rookie  Ronald Acuna Jr . has become the youngest player to hit a grand slam in the postseason. The 20-year-old Acuna made history with his second-inning homer off  Walker Buehler  in the NL Division Series on Sunday night. The previous youngest hitter with a postseason grand slam was Yankees Hall of Famer Mickey Mantle, who was 21 when he accomplished the feat against the Brooklyn Dodgers in the 1953 World Series. Buehler issued a bases-loaded walk to Braves pitcher  Sean Newcomb  to force in a run. Acuna took three balls and a questionable called strike before pulling a 98-mph fastball from Buehler into the seats in left-center. The homer gave the Braves, who trail 2-0 in the series, a 5-0 lead. The five second-inning runs were the first of the series for Atlanta. Associated Press