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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Lg | LgAvg | LgERA | Champion | Year | Champion | LgERA | LgAvg | Lg |
|---|---|---|---|---|---|---|---|---|
| AL | .296 | 4.23 | 1871 | 4.21 | .277 | NL | ||
| AL | .294 | 3.62 | 1872 | 3.79 | .278 | NL | ||
| AL | .288 | 3.62 | 1873 | 3.41 | .281 | NL | ||
| AL | .281 | 3.42 | 1874 | 3.28 | .260 | NL | ||
| AL | .271 | 2.14 | 1875 | 2.81 | .235 | NL | ||
| AL | .256 | 2.42 | 1876 | 2.52 | .258 | NL | ||
| AL | .260 | 2.82 | 1877 | 3.00 | .254 | NL | ||
| AL | .243 | 2.92 | 1878 | 2.37 | .263 | NL | ||
| AL | .246 | 2.75 | 1879 | 2.52 | .258 | NL | ||
| AL | .245 | 2.59 | 1880 | 2.47 | .244 | NL | ||
| AL | .256 | 2.91 | 1881 | 2.69 | .253 | NL | ||
| AL | .235 | 3.03 | 1882 | 2.61 | .258 | NL | ||
| AL | .250 | 3.16 | 1883 | 3.27 | .264 | NL | ||
| AL | .241 | 2.97 | 1884 | 3.18 | .245 | NL | ||
| AL | .243 | 3.28 | 1885 | 2.79 | .245 | NL | ||
| AL | .240 | 3.61 | 1886 | 3.12 | .253 | NL | ||
| AL | .274 | 4.30 | 1887 | 4.03 | .267 | NL | ||
| AL | .239 | 3.16 | 1888 | 2.73 | .238 | NL | ||
| AL | .261 | 4.05 | 1889 | 3.81 | .265 | NL | ||
| AL | .253 | 3.85 | 1890 | 3.60 | .254 | NL | ||
| AL | .257 | 3.64 | 1891 | 3.44 | .253 | NL | ||
| AL | .250 | 3.33 | 1892 | 3.24 | .245 | NL | ||
| AL | .268 | 4.27 | 1893 | 4.43 | .282 | NL | ||
| AL | .282 | 4.31 | 1894 | 5.36 | .313 | NL | ||
| AL | .281 | 4.04 | 1895 | 4.81 | .295 | NL | ||
| AL | .278 | 3.78 | 1896 | 4.43 | .288 | NL | ||
| AL | .280 | 3.65 | 1897 | 4.46 | .289 | NL | ||
| AL | .269 | 3.53 | 1898 | 3.55 | .268 | NL | ||
| AL | .268 | 3.97 | 1899 | 3.54 | .286 | NL | ||
| AL | .268 | 3.97 | 1900 | 3.69 | .279 | NL | ||
| AL | .279 | 3.48 | 1901 | 2.73 | .256 | NL | ||
| AL | .263 | 2.94 | 1902 | 2.73 | .258 | NL | ||
| AL | .259 | 2.83 | Boston Americans | 1903 | Pittsburgh Pirates | 2.71 | .255 | NL |
| AL | .247 | 2.61 | New York Highlanders | 1904 | Pittsburgh Pirates | 2.64 | .248 | NL |
| AL | .243 | 2.54 | Chicago White Sox | 1905 | Pittsburgh Pirates | 2.66 | .249 | NL |
| AL | .240 | 2.46 | Washington Senators | 1906 | Pittsburgh Pirates | 2.48 | .244 | NL |
| AL | .247 | 2.60 | Boston Americans | 1907 | Pittsburgh Pirates | 2.50 | .244 | NL |
| AL | .240 | 2.60 | Detroit Tigers | 1908 | Cincinnati Reds | 2.43 | .245 | NL |
| AL | .244 | 2.69 | Chicago White Sox | 1909 | Boston Doves | 2.54 | .245 | NL |
| AL | .252 | 3.02 | New York Highlanders | 1910 | Brooklyn Superbas | 2.68 | .253 | NL |
| AL | .272 | 3.58 | Detroit Tigers | 1911 | Pittsburgh Pirates | 3.26 | .266 | NL |
| AL | .281 | 3.84 | New York Highlanders | 1912 | Boston Braves | 3.41 | .269 | NL |
| AL | .265 | 3.37 | 1913 | 2.98 | .255 | NL |
