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Single-Season Leaders & Records for Win-Loss %

Photo of Roy Face Photo of Johnny Allen Photo of Perry Werden Photo of Greg Maddux+ Photo of Randy Johnson+ Photo of Ron Guidry Photo of Freddie Fitzsimmons Photo of Lefty Grove+ Photo of <strong>Aaron Sanchez</strong> Photo of Bob Stanley Photo of Cliff Lee Photo of Preacher Roe Photo of Ron Davis Photo of Fred Goldsmith Photo of <strong>Clayton Kershaw</strong> Photo of Deacon Phillippe Photo of <strong>Max Scherzer</strong> Photo of Tom Seaver+ Photo of Smoky Joe Wood Photo of Roger Clemens

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

Statistic Description: Win-Loss Percentage W / (W + L) For players, leaders need one decision for every ten team games. For managers, minimum to qualify for leading is 320 games.

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.

For batting rate stats, generally a minimum of 3.1 Plate Appearances/G, 1.0 IP/G, 0.67 Gm and Chances/Team Game (fielding), 0.2 SB att/Team Game (catchers), and 0.1 SB att/Team Game (baserunners only since 1951), and 0.1 decision/G for single-season leaderboards generally needed for rate statistics. For pitcher fielding the minimums are reduced by a third. For LF, CF, RF fielding stats, we only have reliable data since 1954, so all leaders are since 1954. Explanation of min. requirements

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