If a pitcher makes his major league debut in the bottom of the ninth with the score tied, and his first and only pitch is a walk off solo shot, what's his ERA? Keep in mind he has one pitch, no outs, no innings, and has given up one.
so since you can't divide anything into zero, he doesnt have a ERA yet, until he completes a full inning. but the one run should like carry over to the full inning.
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