Ground rule double

In baseball, a ground rule double is any award of two bases from the time of pitch to all baserunners including the batter-runner. Such an award is traditionally called a "ground rule" double even though the award is usually not a result of ground rules. Most commonly, a batted ball bouncing fair on the field and then leaving play (such as over a fence) is called a ground rule double. However, any fair ball that leaves the playing field in a situation where regulations prohibit calling the hit a home run is also a ground rule double.

Minnesota was hurt by a blown call by left-field umpire Phil Cuzzi in the top of the 11th. Joe Mauer started the inning with a drive down the line that appeared to go off Melky Cabrera 's glove before clearly landing about a foot inside the line and bouncing into the stands.
Cuzzi said it was foul - it's been a tough week for umpires, with several missed calls - and Mauer ended up with a single when he should have had a ground-rule double.
''You can't see at all from the dugout, but I think we all know the ball was fair by a long ways,'' Twins manager Ron Gardenhire said.