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Single-Season Leaders & Records for Win Probability Added (WPA)

Photo of Barry Bonds Photo of Barry Bonds Photo of Barry Bonds Photo of Willie McCovey+ Photo of Mark McGwire Photo of <strong>Albert Pujols</strong> Photo of Mickey Mantle+ Photo of Todd Helton Photo of Mickey Mantle+ Photo of Joe Torre+ Photo of <strong>David Ortiz</strong> Photo of Jason Giambi Photo of Mickey Mantle+ Photo of Carl Yastrzemski+ Photo of Ted Williams+ Photo of Will Clark Photo of <strong>Ryan Howard</strong> Photo of Barry Bonds Photo of Roberto Clemente+ Photo of Hank Aaron+

+ - 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.

Only players who finished in the top 40 for the majors in a season will appear on this list.
Leaders from the current season are only included for rate stats after July 1st.

This statistic is computed from play-by-play data which is only complete from 1974 to the present. From 1938-1973, 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.

Note that seasons prior to 1876 are not included in single-season marks, but are included in career marks.