Every inherited runner who scores when a relief pitcher is in the game counts as an inherited run allowed against that relief pitcher. It's a way of quantifying how well a reliever performs when thrown into a situation with men already on base. (This is somewhat necessary, for evaluation purposes, because those runs won't be charged against that relief pitcher's ERA.)
Inherited runs allowed shouldn't be looked at in a leaderboard context, as some of the best relievers at stranding runners are among the leaders in IR-A because they appear so frequently in situations with runners on base.
Watch: David Robertson enters with the bases loaded and allows three inherited runs to score.
In A Call
"inherited runs," "inherited runs against," "inherited runs scored," "inherited runners who scored"