This day in baseball: Ground rule double

On December 12, 1930, the National League decided that a ball that bounces over the fence and into the stands would no longer be considered a home run, but a ground rule double.  The American League had already adopted this rule prior to the 1930 season. Before this rule was in place, all batted balls that cleared the fence after bouncing in fair territory or on a fly counted as home runs.


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