A man by the name of Brian Matusz held the worst qualifying ERA in a season. It was 10.69. I am still looking for the worst qualifying career ERA.
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A hurler is a slang term for a pitcher in baseball. ERA stands for Earned Run Average and is a statistic for pitchers that shows the number of 'earned' runs a pitcher allows for every nine innings. An earned run is a run that is scored without the help of an error or passed ball. One might think that the earned run average of a pitcher is similar to that of the batting average of a hitter.
In 1962, the NL ERA was 3.94 (6,345 earned runs in 14,490 innings pitched) and the AL ERA was 3.97 (6,402 earned runs in 14515 innings pitched) for an MLB average of 3.9553.
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Pedro Martinez of the Boston Red Sox led MLB in ERA in 2003 with 2.22.