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Earned run average

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A pitcher's Earned Run Average (aka ERA) is a primary measure of his success. It is expressed as an average number of opponents' earned runs scored per notional nine inning game:

ERA = Earned Runs Allowed * 9 / Innings Pitched
All Time Leaders
Span Player Total Notes
Career Ed Walsh 1.82
Season Tim Keefe 0.86 1880
Season (since 1920) Bob Gibson 1.12 1968
NPB Career Hideo Fujimoto 1.90
NPB Season Hideo Fujimoto 0.73 1943
KBO Career Dong-yol Sun 1.20
Cuban Career José Antonio Huelga 1.50 Post-Revolution
AAGPBL Career Jean Faut 1.23
AAGPBL Season Lois Florreich 0.67 1949
MLB Career minimum 1000 innings

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