Batting Average with Runners in Scoring Position
Encyclopedia
Batting Average with Runners in Scoring Position (abbreviated BA/RISP or BA/RSP) is a baseball statistic derived by dividing a players hits with runners in scoring positions
Scoring position
In the sport of baseball, a baserunner is said to be in scoring position when he is on second or third base. The distinction between being on first base and second or third base is that a runner on first can usually only score if the batter hits an extra base hit, while a runner on second or third...

 (i.e. on second or third base) by his at bats with runners in scoring position. Batting Average with Runners in Scoring Position is often used as an indicator of clutch ability
Clutch hitter
A clutch hitter is a baseball player with a knack for coming up with the "big" hit. The big hit is typically a game-deciding hit, sometimes a home run, often coming with two outs...

, as a hit with a runner on second or third will likely score the runner and is thus considered a clutch situation. Recently, however, the statistic has been replaced with Win Probability Added
Win Probability Added
Win probability added is a sport statistic which attempts to measure a player's contribution to a win by figuring the factor by which each specific play made by that player has altered the outcome of a game...

, considered to be a better measure of clutch ability.

A variation to this statistic is called Batting Average with two outs and Runners in Scoring Position, which is also calculated by dividing a players' hits with runners on second or third by his at bats in this situation. A hit is more likely to score at least one or two runs-depending on the speed of the runner, the strength of the outfielder's arm, the number of runners in scoring position, etc-because the runners will be going on contact--that is, they run once the batter hits the ball. But if the batter records an out, then the inning ends with those runners left on base.
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