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Yearly League Leaders & Records for Win Probability Added (WPA)
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Yearly League
+ - Indicates Hall of Famer. Bold indicates active player.
Statistic Description: Win Probability Added for Offensive Player Given average teams, this is the change in probability caused by this batter during the game A change of +/- 1 would indicate one win added or lost.
This statistic is computed from play-by-play data which is only complete from 1974 to the present. From 1945-1973, the data is incomplete, though for most seasons only less than 20 games per season total are missing. Please see our page on data coverage for a full view of the data used to create these lists.
See Front Page for time of last update
Much of the play-by-play, game results, and transaction information
both shown and used to create certain data sets was obtained free of
charge from and is copyrighted by RetroSheet.
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
selected seasons (players who debuted before 1960) for which we
believe the image has reverted into the public domain. We will
quickly remove any images for which that can be shown to not be the
case.Please let us know if you are aware of any
such images on this site.
Play Index
Loading Photos from the George Grantham
Bain Collection at the Library of Congress.
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