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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Year | Champion | LgERA | LgAvg | Lg |
|---|---|---|---|---|
| 1876 | Philadelphia Centennials | 2.44 | .259 | CL |
| 1877 | Chicago Chiefs | 3.46 | .282 | CL |
| 1878 | Brooklyn Unions | 2.61 | .257 | CL |
| 1879 | Brooklyn Unions | 2.88 | .265 | CL |
| 1880 | Philadelphia Centennials | 2.64 | .246 | CL |
| 1881 | Chicago Chiefs | 3.14 | .259 | CL |
| 1882 | Philadelphia Centennials | 3.30 | .264 | CL |
| 1883 | Boston Pilgrims | 3.16 | .266 | CL |
| 1884 | Boston Pilgrims | 3.09 | .253 | CL |
| 1885 | New York Gothams | 3.03 | .250 | CL |
| 1886 | Providence Gems | 3.13 | .250 | CL |
| 1887 | Providence Gems | 3.65 | .271 | CL |
| 1888 | Providence Gems | 2.81 | .241 | CL |
| 1889 | St. Louis Pioneers | 3.89 | .272 | CL |
| 1890 | St. Louis Pioneers | 3.42 | .260 | CL |
