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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | EFF | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Ben Axford | 1.067 | 1914-1920 | |
| 2 | Taisho Sekiguchi | 1.027 | 1977-1990 | |
| 3 | Sergio Esparza | 1.014 | 1928-1942 | |
| 4 | Marcos López# | 0.972 | 1978-1990 | |
| 5 | Edward Reed | 0.957 | 1941-1945 | |
| 6 | August Prohaska | 0.952 | 1976-1990 |
