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Year-by-Year Top-Tens Leaders & Records for Earned Run Average
Baseball Leaders & Baseball Records:
Single-Season
Career
Active
Progressive
Year-by-Year Top-Tens
Yearly League
+ - Indicates Hall of Famer. Bold indicates active player.
Statistic Description: 9 * ER / IP For recent years, leaders need 1 IP per team game played
This table lists the MLB top ten for each season in this category. When possible we have used the leaderboard standards at that time to compute the top ten players for this statistic.
Baseball Leaders & Baseball Records:
Single-Season
Career
Active
Progressive
Year-by-Year Top-Tens
Yearly League
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Win
Expectancy, Run Expectancy, and Leverage Index calculations provided by Tom Tango of InsideTheBook.com, and
co-author of The
Book: Playing the Percentages in Baseball.
Total Zone Rating and Wins above Replacement calculations
provided by Sean Smith of BaseballProjection.com.
Full-year
historical Major League statistics provided by Pete Palmer and Gary
Gillette of 24-7
Baseball.
Some
defensive statistics Copyright BIS, 2010-2011 
.
.Player head
shots courtesy of David Davis. Many thanks to him. We have only
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