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| League Index | |
| Bold indicates World Championship Champion | |
| Lg | LgAvg | LgERA | Champion | Year | Champion | LgERA | LgAvg | Lg |
| NL | .288 | 3.89 | Boston Red Stockings |
1871 | ||||
| NL | .275 | 2.92 | Washington Olympics |
1872 | ||||
| NL | .308 | 3.36 | Baltimore Canaries |
1873 | ||||
| NL | .276 | 2.87 | Baltimore Canaries |
1874 | ||||
| NL | .269 | 2.78 | St. Louis B Brown Stockin |
1875 | ||||
| NL | .278 | 2.87 | Chicago White Stockings |
1876 | ||||
| NL | .289 | 3.57 | Chicago White Stockings |
1877 | ||||
| NL | .266 | 2.75 | Boston Red Caps |
1878 | ||||
| NL | .275 | 3.55 | Boston Red Caps |
1879 | ||||
| NL | .254 | 3.05 | Boston Red Caps |
1880 | ||||
| NL | .259 | 3.28 | Providence Grays |
1881 | ||||
| NL | .258 | 3.22 | Philadelphia (A) Athletic |
1882 | ||||
| NL | .261 | 3.17 | New York (A) Metropolitan |
1883 | ||||
| NL | .248 | 3.08 | Brooklyn (A) Atlantics |
1884 | ||||
| NL | .248 | 3.39 | Providence Grays |
1885 | ||||
| NL | .255 | 3.28 | St. Louis (A) Browns |
1886 | ||||
| NL | .318 | 4.92 | Chicago White Stockings |
1887 | ||||
| NL | .249 | 2.92 | Detroit Wolverines |
1888 | ||||
| NL | .267 | 3.76 | St. Louis (A) Browns |
1889 | ||||
| NL | .254 | 2.96 | Philadelphia (A) Athletic |
1890 | ||||
| NL | .257 | 3.28 | St. Louis (A) Browns |
1891 | ||||
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