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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Willson Contreras# | .6247 | 2018 | |
| 2 | Austin Wells# | .6026 | 2024 | |
| 3 | Dustin Garneau | .5967 | 2017 | |
| 4 | Drake Baldwin# | .5961 | 2025 | |
| 5 | Deivy Grullon# | .5441 | 2021 | |
| 6 | Devin Mesoraco | .5266 | 2013 | |
| 7 | Tim Federowicz | .5180 | 2017 | |
| 8 | Zach Britton# | .5023 | 2023 | |
| 9 | Francisco Mejia# | .4916 | 2025 | |
| 10 | Henry Davis# | .4910 | 2024 | |
| 11 | Bryan Lavastida# | .4906 | 2023 | |
| 12 | Luis Campusano# | .4893 | 2021 | |
| 13 | Moises Ballesteros# | .4885 | 2025 | |
| 14 | Andrew Knapp# | .4826 | 2021 | |
| 15 | Sandy Leon# | .4661 | 2017 | |
| 16 | Steve Lerud | .4640 | 2013 | |
| 17 | Bryan Lavastida# | .4590 | 2022 | |
| 18 | Max Stassi# | .4575 | 2015 | |
| 19 | Rafael Lopez | .4436 | 2018 | |
| 20 | Tyler Heineman# | .4378 | 2018 | |
| 21 | Endy Rodriguez# | .4257 | 2023 | |
| 22 | Hector Sanchez | .4213 | 2013 | |
| 23 | Tyler Heineman# | .4141 | 2019 | |
| 24 | Juan Centeno# | .4136 | 2017 | |
| 25 | Garrett Stubbs# | .4084 | 2019 | |
| 26 | Jhonny Pereda# | .3990 | 2025 | |
| 27 | Jose Lobaton | .3963 | 2016 | |
| 28 | Reese McGuire# | .3951 | 2018 | |
| 29 | Garrett Stubbs# | .3931 | 2018 | |
| 30 | Drew Romo# | .3830 | 2024 | |
| 31 | Luke Maile# | .3623 | 2023 | |
| 32 | Cam Maron | .2998 | 2015 |
