Rank | Team | Earned Run Average | Record |
1. | St. Louis Cardinals, 1968 | 2.5375 | 105-57 |
2. | Detroit Tigers, 1968 | 2.6296 | 99-63 |
3. | Brooklyn Dodgers, 1942 | 2.6348 | 102-52 |
4. | New York Mets, 1969 | 2.6352 | 106-56 |
5. | St. Louis Cardinals, 1943 | 2.6405 | 102-52 |
6. | San Diego Padres, 1978 | 2.6659 | 101-61 |
7. | Chicago White Sox, 1967 | 2.6988 | 88-74 |
8. | Boston Red Sox, 1942 | 2.7214 | 102-52 |
9. | Chicago White Sox, 1952 | 2.7261 | 101-53 |
10. | Los Angeles Dodgers, 1973 | 2.7335 | 109-54 |
11. | San Francisco Giants, 1968 | 2.7371 | 103-59 |
12. | Chicago White Sox, 1943 | 2.7390 | 87-67 |
13. | Cincinnati Reds, 1943 | 2.7577 | 90-64 |
14. | Pittsburgh Pirates, 1968 | 2.7612 | 80-82 |
15. | Washington Senators, 1945 | 2.7701 | 85-69 |
16. | Los Angeles Dodgers, 1965 | 2.7749 | 84-78 |
17. | Baltimore Orioles, 1968 | 2.7886 | 82-80 |
18. | Washington Senators, 1942 | 2.7978 | 84-70 |
19. | Cincinnati Reds, 1974 | 2.8080 | 100-62 |
20. | Brooklyn Dodgers, 1952 | 2.8182 | 117-37 |
21. | Pittsburgh Pirates, 1991 | 2.8216 | 103-59 |
22. | New York Mets, 1968 | 2.8269 | 87-75 |
23. | Washington Senators, 1952 | 2.8279 | 84-70 |
24. | St. Louis Cardinals, 1967 | 2.8389 | 98-64 |
25. | Boston Red Sox, 1976 | 2.8539 | 108-54 |
26. | Montreal Expos, 1980 | 2.8586 | 118-44 |
27. | San Diego Padres, 2007 | 2.8593 | 112-50 |
28. | Montreal Expos, 1992 | 2.8594 | 96-66 |
29. | Cincinnati Reds, 1976 | 2.8695 | 113-49 |
30. | New York Mets, 1988 | 2.9002 | 104-58 |
31. | Pittsburgh Pirates, 1943 | 2.9021 | 71-83 |
32. | Oakland A's, 1968 | 2.9087 | 84-78 |
33. | Boston Red Sox, 1986 | 2.9142 | 109-53 |
34. | Cincinnati Reds, 1967 | 2.9222 | 103-59 |
35. | Detroit Tigers, 1943 | 2.9317 | 73-81 |
36. | Detroit Tigers, 1946 | 2.9384 | 104-51 |
37. | Washington Senators, 1943 | 2.9405 | 85-69 |
38. | Montreal Expos, 1982 | 2.9413 | 108-54 |
39. | Cincinnati Reds, 1964 | 2.9453 | 98-65 |
40. | Washington Senators, 1954 | 2.9462 | 87-67 |
41. | New York Yankees, 1943 | 2.9481 | 88-66 |
42. | San Francisco Giants, 1966 | 2.9525 | 98-64 |
43. | Cincinnati Reds, 1972 | 2.9558 | 106-56 |
44. | San Diego Padres, 1984 | 2.9591 | 104-58 |
45. | Montreal Expos, 1985 | 2.9627 | 101-61 |
46. | Washington Senators, 1944 | 2.9645 | 95-59 |
47. | Cincinnati Reds, 1946 | 2.9662 | 87-67 |
48. | Atlanta Braves, 1968 | 2.9682 | 74-88 |
49. | Los Angeles Dodgers, 1976 | 2.9692 | 77-85 |
50. | San Francisco Giants, 1989 | 2.9713 | 91-71 |