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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Werner Schwarzacher# | .6230 | 1980-1987 | |
| 2 | Jason Cawston# | .5777 | 1982-1987 | |
| 3 | Gonzalo Rivera | .5638 | 1981-1989 | |
| 4 | Kostenka Agatyev# | .5486 | 1980-1988 | |
| 5 | Bastiaan van Noord | .5288 | 1941-1946 | |
| 6 | Miloslav Formanova# | .5124 | 1982-1988 | |
| 7 | Melvin Fairchild# | .4906 | 1980-1985 | |
| 8 | Arjen Koornberg | .4891 | 1927-1933 | |
| 9 | Clarence McPherson# | .4883 | 1981-1990 | |
| 10 | Eduardo Martínez | .4882 | 1927-1932 | |
| 11 | Calogero Carnini# | .4794 | 1979-1987 | |
| 12 | Juriaan Achterberg# | .4755 | 1981-1987 | |
| 13 | Bob Majors | .4738 | 1976-1984 | |
| 14 | Artie Gonzáles | .4729 | 1981-1985 | |
| 15 | Dermot Lee | .4710 | 1982-1988 | |
| 16 | Roy Heygate | .4707 | 1944-1953 | |
| 17 | Cameron Shakelady# | .4613 | 1984-1990 | |
| 18 | Konstantine Wavkin# | .4546 | 1981-1989 | |
| 19 | Jeremias Hertz | .4541 | 1949-1954 | |
| 20 | Reima Reima# | .4486 | 1983-1987 | |
| 21 | Sergio Bouvard | .4481 | 1941-1950 | |
| 22 | Omer Belt | .4456 | 1953-1960 | |
| 23 | Richard Littlechild | .4409 | 1972-1990 | |
| 24 | Carl Merrills | .4340 | 1941-1954 | |
| 25 | Achatius Kumbernuss# | .4328 | 1983-1989 | |
| 26 | Forest Barrett# | .4251 | 1979-1990 | |
| 27 | Petteri Rosberg | .4250 | 1935-1942 | |
| 28 | Korybut Resotka | .4124 | 1960-1970 | |
| 29 | James Botting# | .4051 | 1982-1990 | |
| 30 | Max Gibbard# | .3972 | 1982-1990 | |
| 31 | Luca Sertori | .3924 | 1954-1960 | |
| 32 | Shinkichi Takatsu# | .3840 | 1982-1988 | |
| 33 | Arnold Petersohn | .3823 | 1956-1964 | |
| 34 | Charlie Stubbs# | .3818 | 1976-1989 | |
| 35 | Raul Piron | .3788 | 1967-1972 | |
| 36 | Hughie Wintle# | .3761 | 1982-1989 |
