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Career Leaders & Records for Win Probability Added (WPA)

Photo of Roger Clemens Photo of Greg Maddux+ Photo of Warren Spahn+ Photo of Mariano Rivera Photo of Tom Seaver+ Photo of Lefty Grove+ Photo of Pedro Martinez+ Photo of Randy Johnson+ Photo of Jim Palmer+ Photo of Mike Mussina Photo of John Smoltz+ Photo of Bob Gibson+ Photo of Roy Halladay Photo of Bob Feller+ Photo of Whitey Ford+ Photo of Gaylord Perry+ Photo of Tom Glavine+ Photo of Curt Schilling Photo of <strong>Clayton Kershaw</strong> Photo of Robin Roberts+

+ - Indicates Hall of Famer. Bold indicates active player.

Statistic Description: Win Probability Added by Pitcher Given average teams, this is the change in probability A change of +/- 1 would indicate one win added or lost.

Minimum of 1000 IP, 3000 PA, 500 games (fielding, 500 IP for Ps), 200 stolen base attempts (catchers) or 80 stolen base attempts (baserunners only since 1951) or 100 decisions for career and active leaderboards for rate statistics.

This statistic is computed from play-by-play data which is only complete from 1974 to the present. From 1930-1973, 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.