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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | George Mayer | .5376 | 1955-1962 | |
| 2 | Dermott Barden | .5083 | 1958-1969 | |
| 3 | Francisco Reyes | .5037 | 1960-1969 | |
| 4 | Adham Da'ud | .5035 | 1968-1980 | |
| 5 | Rossano Andretta | .4935 | 1958-1968 | |
| 6 | Raphaël Roman | .4832 | 1960-1970 | |
| 7 | Conchúr Labourer | .4802 | 1964-1977 | |
| 8 | Jeff Rigden | .4789 | 1933-1944 | |
| 9 | George Trask# | .4751 | 1981-1990 | |
| 10 | Chris Makeever | .4685 | 1939-1949 | |
| 11 | Stanley Howell# | .4257 | 1985-1990 | |
| 12 | Andreas Zettel | .4252 | 1933-1946 | |
| 13 | Lee Burrough | .3581 | 1913-1922 | |
| 14 | Ray Arden | .3475 | 1945-1950 | |
| 15 | Scott Corson | .3437 | 1939-1949 |
