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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Toshitsugu Sakamoto# | .5929 | 2020 | |
| 2 | David Gómez# | .5028 | 2021 | |
| 3 | José Alonso# | .4855 | 2021 | |
| 4 | Keith Spear# | .4736 | 2021 | |
| 5 | Kyle Dempsey# | .4051 | 2020 | |
| 6 | Matt Hartnett# | .3631 | 2021 | |
| 7 | Carlos Rodríguez# | .3611 | 2021 | |
| 8 | Johnny Foster# | .3344 | 2020 |
