Mariano Rivera's lowest ERA in a single season was 1.38 in 2005.
Mariano Rivera
As of 2009 Mariano Rivera has a 2.25 career ERA.
Through the 2011 season, Mariano Rivera has a career ERA of 2.21. He also has a career postseason ERA of 0.70.
Mariano Rivera won three games as a starter in his career. That was in 1995.
Through games played on May 28, 2009 that is Mariano Rivera with a career ERA of 2.29 (287 earned runs in 1043 1/3 innings pitched).
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
All-time stats leaders for Yankees pitchers:Wins - Whitey Ford (236)Strikeouts - Whitey Ford (1,956)ERA - Mariano Rivera - (2.21)Saves - Mariano Rivera - (603)
Whitey Ford has the most career victories as a Yankee with 236 from 1950-1967.
Entering the 2008 season, that would be Pedro Martinez of the New York Mets with a career ERA of 2.81. Second is Greg Maddux with 3.12 and third is Roy Oswalt at 3.14.