Through the 2011 season, Mariano Rivera has a career ERA of 2.21. He also has a career postseason ERA of 0.70.
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Mariano Rivera has the best career postseason ERA wit 0.74 in 133.1 innings pitched.
Season: Bob Gibson of the St. Louis Cardinals at 1.12 in 1968. Gibson had 13 shutouts that season along with 28 complete games. Career: For pitchers that started their career after 1920, that is Mariano Rivera of the New York Yankees at 2.30 (as of June 30, 2009).
In MLB, that would be Hall of Famer Ed Walsh who pitched with the Chicago White Sox from 1904-1916 and the Boston Braves in 1917. In 2,964 innings, Walsh's ERA was 1.82. Hall of Famer Addie Joss, who pitched for Cleveland from 1902-1910 is second in career ERA. In 2,327 innings, Joss' ERA was 1.89.
Mariano Rivera
Nolan Ryan has a career ERA of 3.19