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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | EFF | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Carlos Bermúdez | 1.083 | 1957-1960 | |
| 2 | Myung-hwan Kim# | 1.076 | 1975-1988 | |
| 3 | Gabriel Zaharia | 1.054 | 1912-1916 | |
| 4 | Kensaku Watanabe | 1.053 | 1966-1971 | |
| 5 | Cordell Callendar | 1.036 | 1978-1982 | |
| 6 | Robert Miller | 1.023 | 1912-1916 | |
| 7 | Paco Aragón# | 0.994 | 1975-1988 | |
| 8 | Stephano Ceriani | 0.987 | 1976-1983 | |
| 9 | Ángel Rojas | 0.985 | 1976-1983 | |
| 10 | Will Baker | 0.934 | 1958-1961 |
