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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Lg | LgAvg | LgERA | Champion | Year | Champion | LgERA | LgAvg | Lg |
|---|---|---|---|---|---|---|---|---|
| AL | .280 | 3.68 | Boston Americans | 1901 | Pittsburgh Pirates | 3.23 | .260 | NL |
| AL | .274 | 3.60 | Boston Americans | 1902 | Pittsburgh Pirates | 3.22 | .261 | NL |
| AL | .256 | 3.21 | Philadelphia Athletics | 1903 | Pittsburgh Pirates | 3.58 | .273 | NL |
| AL | .244 | 2.74 | Boston Americans | 1904 | New York Giants | 2.92 | .248 | NL |
| AL | .245 | 2.89 | Cleveland Naps | 1905 | New York Giants | 2.99 | .246 | NL |
| AL | .245 | 2.84 | Cleveland Naps | 1906 | New York Giants | 3.10 | .252 | NL |
| AL | .245 | 2.65 | Detroit Tigers | 1907 | Chicago Cubs | 2.84 | .246 | NL |
| AL | .237 | 2.59 | Philadelphia Athletics | 1908 | Philadelphia Phillies | 2.77 | .241 | NL |
| AL | .245 | 2.71 | Philadelphia Athletics | 1909 | Chicago Cubs | 3.04 | .248 | NL |
| AL | .253 | 3.13 | New York Highlanders | 1910 | Chicago Cubs | 3.30 | .252 | NL |
| AL | .259 | 3.45 | Philadelphia Athletics | 1911 | New York Giants | 3.98 | .274 | NL |
