A grand slam is a home run hit with the bases loaded — runners on first, second and third. It scores four runs at once, the maximum a single swing can produce, which makes it the biggest play in baseball.
Four runs in one swing
Because all three runners plus the batter score, a grand slam can flip a game in an instant. There’s no bigger momentum swing off a single pitch, which is why the crowd erupts the moment the ball clears the fence.
A rare, huge moment
It needs two things to line up: the bases loaded and a home run, so it doesn’t happen every day. Some of the sport’s most legendary moments are walk-off grand slams — a bases-loaded homer that ends the game on the spot.
FAQ
How many runs does a grand slam score?
Four: the three runners plus the batter.
What is a walk-off grand slam?
A bases-loaded home run that wins the game for the home team in its final at-bat.
