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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | EFF | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Bartolo Hinojosa | 1.064 | 1933-1937 | |
| 2 | Júlio Sánchez | 1.062 | 1953-1955 | |
| 3 | John McBride | 1.051 | 1913-1918 | |
| 4 | Gerrie Looms | 1.047 | 1983-1987 | |
| 5 | David Cox | 1.026 | 1975-1979 | |
| 6 | Eddie Brandt | 0.991 | 1966-1974 | |
| 7 | Monte Brando | 0.975 | 1967-1977 | |
| 8 | Gilberto Cruz | 0.965 | 1975-1983 | |
| 9 | Masashige Takayama | 0.963 | 1945-1949 | |
| 10 | Byron Ford | 0.918 | 1978-1985 |
