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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Ernie Miller# | .5551 | 2015 | |
| 2 | António Rodríguez# | .5371 | 2015 | |
| 3 | António Ávila# | .4417 | 2015 | |
| 4 | António Cuevas# | .3731 | 2015 | |
| 5 | Brent Allen# | .3634 | 2015 | |
| 6 | Stan King# | .3557 | 2015 | |
| 7 | Juan Gonzáles# | .3448 | 2015 |
