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| League Index | |
| Bold indicates World Championship Champion | |
| Lg | LgAvg | LgERA | Champion | Year | Champion | LgERA | LgAvg | Lg |
| AL | .273 | 4.31 | Chicago (A) Minors | 1901 | Michigan Sharks | 4.49 | .273 | NL |
| AL | .258 | 4.09 | Detroit Disciples | 1902 | Philadelphia Underground | 4.57 | .271 | NL |
| AL | .252 | 4.08 | Chicago (A) Minors | 1903 | Philadelphia Underground | 4.44 | .259 | NL |
| AL | .259 | 3.65 | Miami Tidecats | 1904 | Philadelphia Underground | 3.58 | .254 | NL |
| AL | .244 | 3.36 | Castle Rock Nightmares | 1905 | Philadelphia Underground | 3.07 | .231 | NL |
| AL | .231 | 3.28 | Detroit Disciples | 1906 | Philadelphia Underground | 3.79 | .247 | NL |
| AL | .230 | 3.38 | Chicago (A) Minors | 1907 | Philadelphia Underground | 3.63 | .236 | NL |
| AL | .235 | 3.54 | Des Moines Diesel | 1908 | Dublin Dragons | 3.88 | .235 | NL |
| AL | .248 | 3.70 | Detroit Disciples | 1909 | Philadelphia Underground | 3.89 | .249 | NL |
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