Statistics for MLB Baseball Single Season ERA Record by Team

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Team	Answer	ERA	Year	% Correct
Arizona Diamondbacks	Randy Johnson	2.32	2002	97%
Minnesota Twins	Walter Johnson	1.14	1913	97%
Atlanta Braves	Greg Maddux	1.56	1994	89%
St. Louis Cardinals	Bob Gibson	1.12	1968	77%
Houston Astros	Nolan Ryan	1.69	1981	70%
Seattle Mariners	Felix Hernandez	2.14	2014	64%
Miami Marlins	Kevin Brown	1.89	1996	45%
Chicago Cubs	Mordecai Brown	1.04	1906	45%
Tampa Bay Rays	Blake Snell	1.89	2018	42%
Philadelphia Phillies	Pete Alexander	1.22	1915	33%
Milwaukee Brewers	CC Sabathia	1.65	2008	28%
Kansas City Royals	Dan Quisenberry	1.94	1983	17%
Boston Red Sox	Dutch Leonard	0.96	1914	11%
Los Angeles Angels	Bob Lee	1.51	1964	9%
Cleveland Indians	Addie Joss	1.16	1908	8%
Chicago White Sox	Ed Walsh	1.27	1910	6%
Detroit Tigers	John Hiller	1.44	1973	6%
Toronto Blue Jays	Mark Eichhorn	1.72	1986	5%
Los Angeles Dodgers	Rube Marquard	1.58	1916	3%
Pittsburgh Pirates	Babe Adams	1.11	1909	2%
Baltimore Orioles	Barney Pelty	1.59	1906	2%
San Francisco Giants	Ferdie Schupp	0.90	1916	2%
New York Mets	Jesse Orosco	1.47	1983	2%
Texas Rangers	Jim Kern	1.57	1979	2%
New York Yankees	Spud Chandler	1.64	1943	2%
Cincinnati Reds	Ted Abernathy	1.27	1967	2%
Oakland Athletics	Jack Coombs	1.30	1910	0%
San Diego Padres	Luis DeLeon	2.03	1982	0%
Colorado Rockies	Mavin Freeman	2.80	1994	0%
Washington Nationals	Mel Rojas	1.43	1992	0%