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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Sean Hopkins | 0.910 | 2003 | |
| 2 | Francisco Silva# | 0.985 | 2012 | |
| 3 | Arnie Drake | 1.001 | 1995 | |
| 4 | Joseph Pérez | 1.068 | 1994 | |
| 5 | Raymond Hensley | 1.069 | 1957 | |
| 6 | Stephen Sanders | 1.078 | 1974 | |
| 7 | Mark Fulton | 1.127 | 1991 | |
| 8 | Greg Castillo | 1.143 | 1986 | |
| 9 | António Miranda | 1.169 | 1995 | |
| 10 | Aurelio Galindo | 1.172 | 1977 | |
| 11 | Stu Ellis | 1.268 | 1976 | |
| 12 | Larry Adams# | 1.295 | 2002 | |
| 13 | José Carrillo | 1.297 | 1991 | |
| 14 | John Spens | 1.307 | 1979 | |
| 15 | Johnny Hicks | 1.312 | 1994 | |
| 16 | Juan Gonzáles# | 1.329 | 2011 | |
| 17 | Collin Baker | 1.331 | 1973 | |
| 18 | Ken Mack | 1.336 | 1979 | |
| 19 | Bret Boggs | 1.339 | 1994 | |
| 20 | Carlos Nava | 1.355 | 1991 | |
| 21 | Pedro Morales | 1.362 | 1994 | |
| 22 | David Castro | 1.368 | 1987 | |
| 23 | Ramón Santos | 1.369 | 1992 | |
| 24 | Joe Evans# | 1.370 | 2014 | |
| 25 | Jonathan Jensen | 1.381 | 1992 | |
| 26 | Raúl Rodríguez | 1.384 | 1969 | |
| 27 | Roger Patterson | 1.387 | 1992 | |
| 28 | Rafael Cruz | 1.389 | 1996 | |
| 29 | Nick Inman | 1.405 | 1992 | |
| 30 | Jorge Rivera | 1.409 | 1976 | |
| 31 | Dustin Jackson | 1.410 | 1991 | |
| 32 | Larry Williams | 1.419 | 1959 | |
| 33 | Nick Inman | 1.432 | 1991 | |
| 34 | Joaquín Gines | 1.435 | 1991 | |
| 35 | Gabriel Ordóñez# | 1.438 | 2001 | |
| 36 | Sherwood Aguilar | 1.439 | 1996 | |
| 37 | Jessie Walker | 1.446 | 1999 | |
| 38 | Jason Cobb | 1.455 | 1991 | |
| 39 | Salvador Olvera | 1.461 | 1990 | |
| 40 | Morgan Miller# | 1.466 | 2014 | |
| 40 | Jorge González# | 1.466 | 2009 | |
| 42 | Jorge Prado | 1.468 | 1995 | |
| 43 | Christian Clark | 1.471 | 1983 | |
| 44 | Sherwood Aguilar | 1.474 | 1995 | |
| 44 | José Escobar | 1.474 | 1981 | |
| 46 | Preston Jackson | 1.479 | 2000 | |
| 47 | Júlio Rocha | 1.497 | 1999 | |
| 48 | Dave Beadle | 1.498 | 1959 | |
| 49 | Ira Bennett# | 1.503 | 2004 | |
| 49 | Jim Johnson# | 1.503 | 2004 | |
| 51 | Tim Gibson | 1.513 | 1966 | |
| 52 | Oscar Mason | 1.521 | 1973 | |
| 53 | Juan Gonzáles# | 1.523 | 2005 | |
| 54 | Walton Coleman | 1.530 | 1990 | |
| 55 | Jessie Walker | 1.531 | 1998 | |
| 56 | Don Gardner | 1.535 | 1978 | |
| 56 | Paul Hamilton | 1.535 | 1997 | |
| 58 | William Crandell | 1.543 | 1998 | |
| 59 | Bill Vélez | 1.544 | 1999 | |
| 60 | Júlio López | 1.546 | 2010 | |
| 61 | Júlio López | 1.549 | 2009 | |
| 62 | Raúl Ramos | 1.550 | 1994 | |
| 63 | Alfredo Martínez | 1.552 | 1996 | |
| 64 | Eddie Wise | 1.553 | 1997 | |
| 65 | Wade Sainsbury | 1.560 | 1991 | |
| 66 | Stephen Sanders | 1.568 | 1975 | |
| 67 | Tyler Walker | 1.575 | 1994 | |
| 68 | Edward López | 1.578 | 2001 | |
| 69 | Sherwood Aguilar | 1.583 | 1997 | |
| 70 | Dave Hunter | 1.584 | 1967 | |
| 71 | Máximo Hernández | 1.585 | 1968 | |
| 71 | Charlie Jackson# | 1.585 | 2006 | |
| 73 | Pedro Sierra | 1.591 | 1995 | |
| 74 | Joe Brown | 1.597 | 1973 | |
| 75 | Jonathan Jensen | 1.598 | 1991 | |
| 76 | Carlos De Jesús | 1.608 | 1968 | |
| 77 | Dave Robinson# | 1.609 | 2013 | |
| 78 | Eduardo Núñez# | 1.618 | 2013 | |
| 79 | Sergio Jaimes | 1.622 | 1993 | |
| 79 | Clifton Cooper | 1.622 | 1983 | |
| 81 | Clint Graves | 1.624 | 1973 | |
| 82 | Bobby McCarthy# | 1.629 | 2004 | |
| 82 | Jake Webster | 1.629 | 1991 | |
| 84 | Francisco Benítez | 1.634 | 1996 | |
| 85 | Richard Towns | 1.640 | 1986 | |
| 86 | Paul Haney# | 1.642 | 2011 | |
| 87 | Scott Bennett | 1.650 | 1959 | |
| 88 | Zhu-lan Guo | 1.654 | 1984 | |
| 89 | Werner Kelly | 1.656 | 1979 | |
| 90 | Mike King | 1.665 | 1994 | |
| 91 | Raúl Mota | 1.666 | 1993 | |
| 92 | Carlos Morales | 1.668 | 1973 | |
| 93 | Richard Church | 1.670 | 1982 | |
| 93 | Pepe Sánchez# | 1.670 | 2014 | |
| 95 | Mark Miller | 1.674 | 2004 | |
| 96 | Dylan Seals | 1.678 | 1978 | |
| 97 | Albert Patton# | 1.679 | 2014 | |
| 98 | Christian Piper | 1.683 | 2008 | |
| 99 | Reynaldo González | 1.688 | 1997 | |
| 100 | Steve Rogers# | 1.694 | 2015 |
