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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Ken Bradley# | .5452 | 1984 | |
| 2 | Roberto Fernández# | .5014 | 1985 | |
| 3 | Ken Bradley# | .4850 | 1983 | |
| 4 | Ken Bradley# | .4648 | 1982 | |
| 5 | Sammy Campbell# | .4588 | 1986 | |
| 6 | Ken Bradley# | .4472 | 1985 | |
| 7 | Sammy Campbell# | .4448 | 1982 | |
| 8 | José Guzmán# | .4419 | 1981 | |
| 9 | Tim Higgins# | .4358 | 1981 | |
| 10 | Nick Wallace# | .4311 | 1986 | |
| 11 | Danny Wilson# | .4101 | 1985 | |
| 12 | Tim Higgins# | .4087 | 1983 | |
| 13 | Danny Wilson# | .4086 | 1984 | |
| 14 | Terry Hall# | .3959 | 1984 | |
| 15 | Enrique Morales# | .3728 | 1984 | |
| 16 | Enrique Morales# | .3538 | 1985 | |
| 17 | Enrique Morales# | .3536 | 1983 | |
| 18 | Pat Howard# | .3281 | 1982 | |
| 19 | Terry Hall# | .3000 | 1985 |
