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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Lg | LgAvg | LgERA | Champion | Year | Champion | LgERA | LgAvg | Lg |
|---|---|---|---|---|---|---|---|---|
| WL | .286 | 4.47 | 1901 | |||||
| WL | .261 | 2.93 | 1902 | |||||
| WL | .237 | 2.62 | 1903 | |||||
| WL | .254 | 3.01 | 1904 | 2.68 | .236 | EL | ||
| WL | .250 | 2.97 | Louisville Colonels | 1905 | Philadelphia Phillies | 3.03 | .242 | EL |
| WL | .249 | 2.82 | Chicago Orphans | 1906 | Philadelphia Phillies | 2.74 | .244 | EL |
| WL | .243 | 2.65 | Chicago Orphans | 1907 | Philadelphia Phillies | 2.78 | .251 | EL |
| WL | .239 | 2.63 | Chicago Orphans | 1908 | Philadelphia Phillies | 2.81 | .246 | EL |
| WL | .250 | 3.01 | Louisville Colonels | 1909 | Philadelphia Phillies | 2.97 | .246 | EL |
| WL | .254 | 2.71 | Louisville Colonels | 1910 | Philadelphia Phillies | 2.80 | .254 | EL |
| WL | .274 | 3.58 | Louisville Colonels | 1911 | Baltimore Orioles | 3.51 | .274 | EL |
| WL | .268 | 3.18 | Cleveland Spiders | 1912 | Baltimore Orioles | 3.28 | .269 | EL |
| WL | .262 | 2.97 | Louisville Colonels | 1913 | New York Giants | 3.10 | .251 | EL |
| WL | .258 | 2.76 | Cincinnati Reds | 1914 | New York Giants | 2.85 | .253 | EL |
