MLB Single-Season (Post 1900) Pitching Leaders - Earned Run Average
PLAYERYRGGSCGSHIPHERBBSOWLSVERA
51Ray Collins19103526184244.22054441109131111.62
 Rube Waddell19044646398383.03076991349251901.62
 Howie Camnitz19094130206283.0207516813325631.62
 Cy Young19014341385371.13246737158331001.62
55Greg Maddux19952828103209.2147382318119201.63
56Spud Chandler19433030205253.0197465413420401.64
 Ernie Shore19153832174247.0207456610219801.64
 Ed Summers19084032235301.02715555103241211.64
59Dean Chance196446351511278.1194518620720941.65
 Walter Johnson19083630236256.11944753160141411.65
PLAYERYRGGSCGSHIPHERBBSOWLSVERA
 Ed Reulbach19063324206218.012940929419431.65
 Russ Ford19103633298299.2194557020926611.65
63Chief Bender19093429245250.0196464516118811.66
 Carl Hubbell193345332210308.22565747156231251.66
 Sam Leever19073124175216.218240466514901.66
66Otto Hess19042116154151.11342831648701.67
67Joe Wood19103517143198.21553756145121301.68
 Orval Overall19073630268268.1201506914123731.68
69Ed Reulbach19072722164192.014736649617401.69
 Bill Burns19082319112165.013531185561101.69
PLAYERYRGGSCGSHIPHERBBSOWLSVERA
 Claude Hendrix19144937346362.02626877189291051.69
72Rube Foster19143227175211.216440528914801.70
73Addie Joss19093328244242.2198463167141301.71
 Ed Killian19092519143173.115033495411911.71
75Ned Garvin19042524162193.215537809451601.72
 Walter Johnson19145140339371.22877174225281811.72
 Mark Eichhorn198669000157.01053045166146101.72
 Doc White19092421143177.214934317711901.72
 Pete Alexander19193027209235.01804538121161111.72
 Bill Doak19143633167256.0193498711819611.72
PLAYERYRGGSCGSHIPHERBBSOWLSVERA
 Addie Joss19063431289282.0220544310621911.72
82Sandy Koufax19664141275323.0241627731727901.73
 Bob Ewing19074137322332.22796485147171901.73
 Vic Willis19064136326322.02956276124231311.73
85Sandy Koufax19642928157223.0154435322319511.74
 Hippo Vaughn19183533278290.12165676148221001.74
 Charlie Chech19082720144165.213632345111701.74
 Pedro Martinez2000292974217.0128423228418601.74
 Ron Guidry19783535169273.2187537224825301.74
 Carl Mays19173533272289.023056749122901.74
PLAYERYRGGSCGSHIPHERBBSOWLSVERA
 Earl Moore19032927273247.2196486214819911.74
92Babe Ruth19164441239323.223063118170231211.75
93Tom Seaver19713635214286.12105661289201001.76
 Doc White19053633254260.12045158120171301.76
 Eddie Plank19093433243265.12155262132191001.76
96Noodles Hahn19023636356321.02826358142231201.77
 Bob Rhoads19083730201270.0229537362181201.77
 Jack Powell19062826253244.01964855132131411.77
 Clayton Kershaw2014272762198.1139393123921301.77
100Mort Cooper194237352210278.2207556815222701.78