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Single-Season Leaders & Records for Adjusted ERA+

Photo of Tim Keefe+ Photo of Pedro Martinez+ Photo of Dutch Leonard Photo of Greg Maddux+ Photo of Greg Maddux+ Photo of Walter Johnson+ Photo of Bob Gibson+ Photo of Mordecai Brown+ Photo of Walter Johnson+ Photo of Pedro Martinez+ Photo of Christy Mathewson+ Photo of Dwight Gooden Photo of Roger Clemens Photo of Pete Alexander+ Photo of <strong>Zack Greinke</strong> Photo of <strong>Jake Arrieta</strong> Photo of Roger Clemens Photo of Christy Mathewson+ Photo of Pedro Martinez+ Photo of Cy Young+

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

Statistic Description: ERA+ 100*[lgERA/ERA] Adjusted to the player’s ballpark(s).

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.