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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Gabriel Montano# | 0.000 | 1897 | |
| 2 | Hernán García# | 0.551 | 1894 | |
| 3 | John Madding# | 0.978 | 1897 | |
| 4 | Gabe Castañeda# | 1.059 | 1897 | |
| 5 | Josh Kempf# | 1.298 | 1894 | |
| 6 | John Madding# | 1.410 | 1895 | |
| 7 | Carlos Salgado# | 1.440 | 1896 | |
| 8 | Ryan Wade# | 1.473 | 1896 | |
| 9 | Josh Kempf# | 1.500 | 1896 | |
| 10 | Joe Rexford# | 1.588 | 1897 | |
| 11 | Marco Ortiz# | 1.643 | 1897 | |
| 12 | Jesús Ramírez# | 1.711 | 1896 | |
| 13 | Leo O'Neill# | 1.728 | 1897 | |
| 14 | Joe Rexford# | 2.118 | 1894 | |
| 15 | José Rivera# | 2.160 | 1897 | |
| 16 | John Madding# | 2.250 | 1896 | |
| 17 | Carlos Salgado# | 2.423 | 1895 | |
| 18 | Gabriel Montano# | 2.505 | 1895 | |
| 19 | Gabe Castañeda# | 2.647 | 1894 | |
| 20 | John Madding# | 2.667 | 1894 | |
| 21 | Nazir Cornell# | 2.700 | 1896 | |
| 22 | Édgar García# | 2.769 | 1895 | |
| 23 | Édgar García# | 3.352 | 1896 | |
| 24 | Alfonso Gómez# | 3.375 | 1895 | |
| 25 | Adam Dixon# | 3.706 | 1897 | |
| 26 | Alfonso Gómez# | 3.789 | 1896 | |
| 27 | Elián Ramos# | 4.235 | 1897 | |
| 28 | Marco Ortiz# | 4.667 | 1894 | |
| 29 | Ryan Daniels | 5.850 | 1895 |
