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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | John Aston# | .4861 | 2019 | |
| 2 | Jason Alexander# | .4856 | 2019 | |
| 3 | Cole McKnight# | .4498 | 2019 | |
| 4 | Augusto Flores# | .4486 | 2019 | |
| 5 | Lorenzo Ramírez# | .4255 | 2019 | |
| 6 | Joe Chase# | .4013 | 2019 | |
| 7 | Clarence Neal# | .3322 | 2019 | |
| 8 | Sean Booth# | .3189 | 2019 |
