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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Rafael Devers# | .6271 | 2020 | |
| 2 | Vladimir Guerrero Jr.# | .6149 | 2020 | |
| 3 | Alex Bregman# | .6003 | 2020 | |
| 4 | Mike Moustakas# | .5450 | 2020 | |
| 5 | Jeff McNeil# | .5413 | 2020 | |
| 6 | Yoan Moncada# | .5404 | 2020 | |
| 7 | Jose Ramirez# | .5266 | 2020 | |
| 8 | Anthony Rendon# | .5078 | 2020 | |
| 9 | Nolan Arenado# | .5059 | 2020 | |
| 10 | Shed Long Jr.# | .5008 | 2020 | |
| 11 | Kris Bryant# | .4813 | 2020 | |
| 12 | Manny Machado# | .4681 | 2020 | |
| 13 | Nick Senzel# | .4501 | 2020 | |
| 14 | Matt Chapman# | .4471 | 2020 | |
| 15 | Gio Urshela# | .4414 | 2020 | |
| 16 | Eugenio Suarez# | .4343 | 2020 | |
| 17 | Kyle Seager# | .4223 | 2020 | |
| 18 | Brian Anderson# | .4113 | 2020 | |
| 19 | Chad Pinder# | .4110 | 2020 | |
| 20 | Matt Carpenter# | .4062 | 2020 |
