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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Jeff Thomas | .4867 | 1983-1990 | |
| 2 | Eddie Brandt | .4823 | 1966-1974 | |
| 3 | Teruo Takata | .4807 | 1950-1955 | |
| 4 | Jerry Thompson | .4665 | 1912-1916 | |
| 5 | Juan Vázquez# | .4640 | 1984-1991 | |
| 6 | Joshua McGrath# | .4505 | 1983-1989 | |
| 7 | Matt Logan | .4394 | 1975-1979 | |
| 8 | Romeo Brancati | .4325 | 1960-1965 | |
| 9 | Hunter Dominey | .4295 | 1976-1987 | |
| 10 | Chris Carey | .4219 | 1949-1956 | |
| 11 | Clay Anderson | .4090 | 1956-1961 | |
| 12 | Paul Cox | .4032 | 1970-1978 | |
| 13 | Alex Hammond | .3934 | 1913-1926 | |
| 14 | Tim Cox | .3599 | 1957-1961 | |
| 15 | Bryant Thomas | .3567 | 1945-1953 | |
| 16 | Stan Rainey | .3497 | 1911-1916 | |
| 17 | Arvid van Leeuwen | .3380 | 1936-1943 |
