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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | John Mayberry Sr# | .5218 | 1969 | |
| 2 | Dave Kingman# | .4282 | 1981 | |
| 3 | Danny Heep# | .4069 | 1981 | |
| 4 | Greg Cypret# | .3865 | 1981 | |
| 5 | Tom O'Malley# | .3843 | 1981 | |
| 6 | Mike Turgeon# | .3532 | 1981 | |
| 7 | Robert Bonnette# | .3108 | 1981 | |
| 8 | Victor Rios# | .2978 | 1981 | |
| 9 | Tack Wilson# | .2615 | 1981 |
