Who has the best ERA for a MLB season
Mariano Rivera's lowest ERA in a single season was 1.38 in 2005.
The major league pitcher with the highest ERA in a single season who pitched 100 or more innings was Bill Chamberlain. He recorded an ERA of 7.74 in the 1893 season while playing for the St. Louis Browns.
Tom Seaver's lowest ERA in a single season was 1.76 in 1971. Seaver had a record of 20-10 with the New York Mets.
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Tim Keefe of the 1880 Troy Trojans had a 0.86 ERA in 105 innings and is generally considered as having the lowest ERA in an MLB season as the 1880 season was only 84 games long. Since 1900, the lowest ERA belongs to Dutch Leonard of the 1914 Boston Red Sox at 0.96. He had a 19-5 record and threw 224 2/3 innings.
Dutch Leonard of the 1914 Boston Red Sox had an ERA of 0.96 in 1914.
Spud Chandler had a 1.64 ERA in 1943.
1898 Boston Beaneaters with 62 ... their record was 62-15.
Duch Leonard with a .96 era.
Babe Ruth's best record as a pitcher was 23-12 in 1916. He registered a 1.75 ERA during that season.
T. Hudson with a .270 ERA