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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Paul Campbell# | .4847 | 2020 | |
| 2 | Yosuke Kiyomizu# | .4572 | 2020 | |
| 3 | Pancho Salaedo# | .4189 | 2020 | |
| 4 | Roberto López# | .3986 | 2020 | |
| 5 | Jesús Murillo# | .3533 | 2020 | |
| 6 | Jim Browning# | .3466 | 2020 | |
| 7 | Eldon McGillivour# | .2943 | 2020 | |
| 8 | Trevor Gardner# | .2537 | 2020 |
