This is a list of the career leaders in earned run average. In the sport of baseball, a pitcher's earned run average is a statistic denoting the mean of earned runs given up by a pitcher per nine innings pitched.
Ed Walsh holds the Major League Baseball earned run average record with a 1.82. He and Addie Joss are the only two players in Major League Baseball history with 2000 or more innings pitched with an earned run average lower than 2.00 .
Players highlighted in gold are active as of the 2010 Major League Baseball season (including free agents), with the number in parentheses designating that player's earned run average during the 2010 season.
The stats are updated as of the end of the 2010 regular season.
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