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Single-Season Leaders & Records for Earned Run Average

Photo of Tim Keefe+ Photo of Dutch Leonard Photo of Mordecai Brown+ Photo of Bob Gibson+ Photo of Christy Mathewson+ Photo of Walter Johnson+ Photo of Jack Pfiester Photo of Addie Joss+ Photo of Carl Lundgren Photo of Denny Driscoll Photo of Pete Alexander+ Photo of George Bradley Photo of Cy Young+ Photo of Ed Walsh+ Photo of Walter Johnson+ Photo of Christy Mathewson+ Photo of Jack Taylor Photo of Guy Hecker Photo of Jack Coombs Photo of Mordecai Brown+

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

Statistic Description: 9 * ER / IP For recent years, leaders need 1 IP per team game played. Bold indicates lowest ERA using current stats Gold means awarded ERA title at end of year.

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.