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
Season record would be Spud Chandler
Wade Boggs pitched one inning and gave up no runs.
The man on the Yankees with the lowest ERA ever is Spud Chandler in 1943. He had a 1.64 ERA.
Roy Holliday Roy Holliday
ubaldo jimenez Colorado rockies
In 1914 Dutch Leonard had a 0.96 ERA
Felix Hernandez
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.
Pedro Martinez of the Boston Red Sox led MLB in ERA in 2003 with 2.22.
Dave Righetti at 2.05 in 1981.
Jake Peavy of the San Diego Padres (2.54)