Inherited runs allowed
Encyclopedia
In baseball statistics
Baseball statistics
Statistics play an important role in summarizing baseball performance and evaluating players in the sport.Since the flow of a baseball game has natural breaks to it, and normally players act individually rather than performing in clusters, the sport lends itself to easy record-keeping and statistics...

, inherited runs allowed (denoted by IRA) is a measure of the effectiveness of a relief pitcher
Relief pitcher
A relief pitcher or reliever is a baseball or softball pitcher who enters the game after the starting pitcher is removed due to injury, ineffectiveness, fatigue, ejection, or for other strategic reasons, such as being substituted by a pinch hitter...

 who enters a game with runners on base.

Definition: A relief pitcher is charged with an 'inherited run allowed' when he enters the game with a runner or runners on base and one or more of those runners scores a run while that relief pitcher is in the game. The pitcher is charged with one IRA for each such runner that scores.
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