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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Ian Happ# | .5808 | 2020 | |
| 2 | Cody Bellinger# | .5680 | 2020 | |
| 3 | Alex Verdugo# | .5673 | 2020 | |
| 4 | Mike Trout# | .5521 | 2020 | |
| 5 | A.J. Pollock# | .5281 | 2020 | |
| 6 | Ronald Acuna Jr.# | .5120 | 2020 | |
| 7 | Kevin Kiermaier# | .4907 | 2020 | |
| 8 | George Springer# | .4556 | 2020 | |
| 9 | Mark Canha# | .4381 | 2020 | |
| 10 | Jackie Bradley Jr.# | .4165 | 2020 | |
| 11 | Victor Robles# | .4071 | 2020 | |
| 12 | Brandon Nimmo# | .4020 | 2020 | |
| 13 | Byron Buxton# | .3873 | 2020 | |
| 14 | Lorenzo Cain# | .3860 | 2020 | |
| 15 | Ben Gamel# | .3774 | 2020 | |
| 16 | Cristian Pache# | .3390 | 2020 | |
| 17 | Billy Hamilton# | .2951 | 2020 |
