In baseball statistics, earned run average (ERA) is the mean of earned runs given up by a pitcher per nine innings pitched (i.e. the traditional length of a game). It is determined by dividing the number of earned runs allowed by the number of innings pitched and multiplying by nine. Runs resulting from defensive errors (including pitchers' defensive errors) are recorded as unearned runs and are not used to determine ERA.
This is a list of the top 100 players in career earned run average, who have thrown at least 1,000 innings.
Ed Walsh [1] [2] holds the MLB earned run average record with a 1.816. Addie Joss [3] (1.887) and Jim Devlin [4] (1.896) are the only other pitchers with a career earned run average under 2.000.
Rank | Rank amongst leaders in career earned run average. A blank field indicates a tie. |
Player | Name of player. |
ERA | Total career earned run average. |
* | denotes elected to National Baseball Hall of Fame. |
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Bold | denotes active player. [lower-alpha 1] |
Baseball statistics play an important role in evaluating the progress of a player or team.
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In baseball statistics, earned run average (ERA) is the average of earned runs allowed by a pitcher per nine innings pitched. It is determined by dividing the number of earned runs allowed by the number of innings pitched and multiplying by nine. Thus, a lower ERA is better. Runs resulting from passed balls, defensive errors, and runners placed on base at the start of extra innings are recorded as unearned runs and omitted from ERA calculations.