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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | EFF | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Jesús Muńóz | 1.116 | 1936-1946 | |
| 2 | Len Jackson# | 1.045 | 1982-1991 | |
| 3 | Steve McLaughlin | 1.015 | 1954-1965 | |
| 4 | Hanus Huml | 1.001 | 1945-1953 | |
| 4 | Sepp Kiemlen | 1.001 | 1934-1945 | |
| 6 | Reynaldo Ortíz | 0.986 | 1927-1933 | |
| 7 | Ángel Aponte | 0.978 | 1975-1978 | |
| 8 | Merrill Smith | 0.969 | 1975-1989 | |
| 9 | Francisco Ramos | 0.962 | 1933-1940 | |
| 10 | Sterling Patterson | 0.952 | 1946-1955 | |
| 11 | Harold Williams | 0.946 | 1963-1974 | |
| 12 | Bobby Green | 0.941 | 1916-1922 |
