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).
1920 to 1933
I think (though not entirely sure) It was the steampunk era. (Also, the last era before the Wild West ended)
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.
19-18
Pedro Martinez of the Boston Red Sox led MLB in ERA in 2003 with 2.22.
The prohibition Era was from 1920 - 1933
Duch Leonard with a .96 era.
the reds fransisco cordero has a 1.14 era
ERA Technology Ltd was created in 1920.
Mariano Rivera's lowest ERA in a single season was 1.38 in 2005.
1920 to 1933
New Era Cap Company was founded in 1920
1850 - 1920
1920's
1920's
I think (though not entirely sure) It was the steampunk era. (Also, the last era before the Wild West ended)
The man on the Yankees with the lowest ERA ever is Spud Chandler in 1943. He had a 1.64 ERA.