Through the 2009 season, for starting pitchers that pitched at least 162 innings and qualified for the ERA title, that was Allan Anderson with a 2.45 ERA in 1988.
Who has the best ERA for a MLB season
Tim Keefe in 1880 had an ERA of 0.860.
Mariano Rivera's lowest ERA in a single season was 1.38 in 2005.
The modern-era record for highest batting average for a season is held by Napoleon_Lajoie, who hit .426 in 1901, the first year of play for the American_League.
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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.
Single-celled organisms and soft, boneless animals
single-celled organisms and soft, boneless animals
Pangea (the single continent) was present in the late Paleozoic Era and early Mesozoic Era.
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.
Duch Leonard with a .96 era.
Dutch Leonard of the 1914 Boston Red Sox had an ERA of 0.96 in 1914.