(minimum 1,500 innings pitched) PLAYER SPAN PLAYER LEAGUE DIFF Pedro Martinez 1992-2009 2.93 4.40 -1.47 Carl Hubbell 1928-1943 2.98 4.13 -1.15 Lefty Grove 1925-1941 3.06 4.21 -1.15 Hoyt Wilhelm 1952-1972 2.52 3.67 -1.14 Greg Maddux 1986-2008 3.16 4.28 -1.13 Roger Clemens 1984-2007 3.12 4.25 -1.12 Felix Hernandez 2005-2014 3.07 4.15 -1.07 Whitey Ford 1950-1967 2.75 3.80 -1.06 Johan Santana 2000-2012 3.20 4.25 -1.05 Sandy Koufax 1955-1966 2.76 3.77 -1.01 Randy Johnson 1988-2009 3.29 4.30 -1.01 Kevin Brown 1986-2005 3.28 4.26 -0.98 John Smoltz 1988-2009 3.33 4.30 -0.97 Note: ERA became an official statistic in 1913 Source: STATS LLC
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