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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | EFF | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Max Kepler# | 1.048 | 2020 | |
| 2 | Randal Grichuk# | 1.046 | 2020 | |
| 3 | David Dahl# | 1.040 | 2020 | |
| 4 | Austin Meadows# | 1.035 | 2020 | |
| 5 | Mitch Haniger# | 1.032 | 2020 | |
| 6 | Bryce Harper# | 1.028 | 2020 | |
| 7 | Aaron Judge# | 1.020 | 2020 | |
| 8 | Brian Goodwin# | 1.018 | 2020 | |
| 9 | Christian Yelich# | 1.015 | 2020 | |
| 10 | Mookie Betts# | 1.014 | 2020 | |
| 10 | Hunter Renfroe# | 1.014 | 2020 | |
| 12 | Gregory Polanco# | 1.010 | 2020 | |
| 13 | Michael Conforto# | 1.006 | 2020 | |
| 14 | Anthony Santander# | 1.004 | 2020 | |
| 15 | Ramon Laureano# | 1.002 | 2020 | |
| 16 | Kyle Lewis# | 0.999 | 2020 | |
| 17 | Stephen Piscotty# | 0.991 | 2020 | |
| 18 | Charlie Blackmon# | 0.985 | 2020 | |
| 18 | Avisail Garcia# | 0.985 | 2020 | |
| 20 | Adam Eaton# | 0.983 | 2020 | |
| 21 | Kyle Tucker# | 0.973 | 2020 | |
| 22 | Nomar Mazara# | 0.967 | 2020 | |
| 22 | Nick Markakis# | 0.967 | 2020 | |
| 24 | Jorge Soler# | 0.962 | 2020 | |
| 25 | Yasiel Puig# | 0.950 | 2020 | |
| 26 | Nick Castellanos# | 0.947 | 2020 |
