In [[baseball]], a '''ground rule double''' is when a line drive bounces on the field and over the wall in fair territory. The hit is scored as a ground rule double and the batter advances to second base with runners on base advancing two bases in line with this.
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In [[baseball]], a '''ground rule double''' is when a batted ball bounces on the field in fair territory and then over the wall and out of play (the wall can be in fair or foul territory). The hit is scored as a double and all runners on base automatically advance two bases.