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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Kazunori Ito# | .4751 | 2019 | |
| 2 | Jesús Rodríguez# | .4575 | 2019 | |
| 3 | Bill Dennis# | .4335 | 2019 | |
| 4 | Brian King# | .4133 | 2019 |
