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Single-Season Leaders & Records for Earned Run Average


+ - 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.