You can’t use ERA+ for relief pitchers because they don’t put in any innings to qualify on a yearly basis. For example, a relief pitcher who has 1 appearance for the year and doesn’t let in a run has an ERA+ of infinity (I think, although dividing by zero screws thing up). In fact, Rivera’s career ERA+ was 11 before his final year of 194.
Dumb stat for low inning relief pitchers. Probably a dumb stat regardless.
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