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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Ronald Bass# | .6875 | 2015 | |
| 2 | Rich Ramey# | .6628 | 2015 | |
| 3 | César Hernández# | .6618 | 2015 | |
| 4 | Luis Vázquez# | .6260 | 2015 | |
| 5 | Arnold Morrow# | .5782 | 2015 | |
| 6 | Víctor Franco# | .4762 | 2015 | |
| 7 | Jorge Valle# | .4270 | 2015 | |
| 8 | León Gómez# | .4077 | 2015 | |
| 9 | Omar Napa# | .4039 | 2015 | |
| 10 | Bill Bugg# | .4000 | 2015 | |
| 11 | Wyatt Drier# | .3780 | 2015 | |
| 12 | Ralph Petersen# | .3473 | 2015 |
