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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | David Henderson | .481 | 2016-2025 | |
| 2 | Jon Osterman# | .421 | 2028-2036 | |
| 3 | Gregg Wagner | .416 | 2019-2028 | |
| 4 | Nobuo Yamashita | .342 | 2025-2034 |
