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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Kevin Howard | .503 | 2014-2021 | |
| 2 | Luis Muńóz | .471 | 2019-2025 | |
| 3 | António Martínez# | .437 | 2024-2035 | |
| 4 | Arturo Rodríguez# | .396 | 2027-2035 | |
| 5 | Stefano Gaddi | .388 | 2023-2032 | |
| 6 | Matt Sheppard | .354 | 2015-2032 | |
| 7 | Ludwig Kluge | .351 | 2022-2033 |
