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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Tamasaburo Kato# | .5155 | 2020 | |
| 2 | Mark Davis# | .4815 | 2020 | |
| 3 | Juan Martínez# | .3952 | 2020 | |
| 4 | Carlos Gómez# | .3274 | 2020 |
