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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | José Martínez | 2.708 | 2003-2008 | |
| 2 | Juan Vado | 2.983 | 2039-2050 | |
| 3 | Ambrose McCoy | 3.007 | 1996-2002 | |
| 4 | Theophilus Markoullides# | 3.032 | 2051-2056 | |
| 5 | Millard Bell | 3.213 | 1995-2008 | |
| 6 | Jack Sellers | 3.222 | 1997-2007 | |
| 7 | Augusto Villarreal | 3.289 | 2038-2053 | |
| 8 | Marc Pierson | 3.418 | 1999-2007 | |
| 9 | Esteban De La Cruz | 3.525 | 1996-2007 | |
| 10 | José Montoya | 3.586 | 2039-2054 | |
| 11 | Danny Harrell | 3.607 | 2002-2007 | |
| 12 | Gilberto García | 3.626 | 1996-2001 | |
| 13 | Ralph Leslie | 3.639 | 1995-2001 | |
| 14 | Lee Brown | 3.695 | 1995-2000 | |
| 15 | António Jiménez | 3.736 | 2002-2006 | |
| 16 | Emílio Pérez | 3.787 | 2038-2046 | |
| 17 | Hamilton Bayless | 3.798 | 1997-2007 | |
| 18 | Ron Cameron | 3.904 | 2037-2044 | |
| 19 | Ryan Wilson | 3.948 | 2037-2043 | |
| 20 | Willie Peters | 4.079 | 2016-2023 | |
| 21 | José Garza | 4.099 | 1995-2002 | |
| 22 | António Téllez | 4.100 | 2036-2044 | |
| 23 | Juan Jose Morán | 4.122 | 2040-2047 | |
| 24 | Gabriel Hinton | 4.200 | 2003-2011 | |
| 25 | Trent Barrett | 4.293 | 2048-2053 | |
| 26 | Tsukasa Kumagai | 4.498 | 2042-2048 | |
| 27 | Logan Williams# | 4.502 | 2052-2057 | |
| 28 | Manuel Herrera | 4.514 | 2036-2045 | |
| 29 | Juan Rodríguez | 4.545 | 2044-2052 | |
| 30 | Eduardo Vázquez | 4.596 | 2040-2049 | |
| 31 | Carlos Velasco | 4.614 | 2036-2048 | |
| 32 | Raúl Portillo | 4.708 | 2038-2043 | |
| 33 | Mehari Jitu | 5.411 | 2040-2052 | |
| 34 | Timothy Swain# | 5.451 | 2049-2053 | |
| 35 | Christopher Barker | 5.472 | 2043-2052 |
