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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Lg | LgAvg | LgERA | Champion | Year | Champion | LgERA | LgAvg | Lg |
|---|---|---|---|---|---|---|---|---|
| WD | .290 | 4.17 | Galt Terriers | 1927 | Saint John Baptists | 4.29 | .290 | ED |
| WD | .291 | 4.44 | Vancouver Reds | 1928 | Saint John Baptists | 4.46 | .291 | ED |
| WD | .297 | 4.93 | Regina Mounties | 1929 | Saint John Baptists | 4.66 | .296 | ED |
| WD | .289 | 4.76 | Calgary Cowboys | 1930 | Quebec City Patriotes | 5.03 | .304 | ED |
| WD | .275 | 4.33 | Regina Mounties | 1931 | Quebec City Patriotes | 4.52 | .286 | ED |
| WD | .280 | 4.62 | Galt Terriers | 1932 | Saint John Baptists | 4.77 | .287 | ED |
| WD | .280 | 4.55 | Galt Terriers | 1933 | London Knights | 4.85 | .281 | ED |
| WD | .269 | 4.44 | Edmonton Eagles | 1934 | London Knights | 4.45 | .275 | ED |
| WD | .274 | 4.24 | Edmonton Eagles | 1935 | London Knights | 4.11 | .267 | ED |
| WD | .268 | 4.08 | Galt Terriers | 1936 | London Knights | 4.45 | .278 | ED |
| WD | .265 | 3.84 | Galt Terriers | 1937 | London Knights | 4.97 | .286 | ED |
| WD | .278 | 4.48 | Galt Terriers | 1938 | Brantford Athletics | 4.68 | .283 | ED |
| WD | .280 | 4.88 | Galt Terriers | 1939 | Quebec City Patriotes | 4.77 | .279 | ED |
