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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Chad Rivera# | 1.742 | 2015 | |
| 2 | Sixto Lucero# | 1.985 | 2015 | |
| 3 | José Alonzo# | 2.160 | 2015 | |
| 4 | Lawrence Robinson# | 4.418 | 2015 | |
| 5 | Gonzalo Valéncia# | 4.426 | 2015 | |
| 6 | Carlos López# | 12.064 | 2015 |
