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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Royal Guerriero | 0.911 | 1960 | |
| 2 | Bennett Dotson | 1.101 | 1979 | |
| 3 | Walton Coleman | 1.117 | 1991 | |
| 4 | David Martínez | 1.120 | 1996 | |
| 5 | Mason Moore# | 1.225 | 2010 | |
| 6 | Jorge Rodríguez | 1.252 | 1995 | |
| 7 | Esteban Martínez# | 1.259 | 2007 | |
| 8 | Alberto Cortéz | 1.271 | 1995 | |
| 9 | Raúl Ramos | 1.284 | 1996 | |
| 10 | Robin Joseph# | 1.286 | 2010 | |
| 11 | Gilberto Flores | 1.341 | 1997 | |
| 12 | Adrián González# | 1.350 | 2012 | |
| 13 | Jeremy Gill | 1.395 | 2000 | |
| 14 | Cam Joyce# | 1.399 | 2015 | |
| 15 | Martin Martínez | 1.414 | 1992 | |
| 16 | Alberto Coronado | 1.427 | 1991 | |
| 17 | Chris Sanders | 1.442 | 1997 | |
| 18 | Greg Welsham | 1.447 | 1995 | |
| 19 | José Valéncia | 1.459 | 1989 | |
| 20 | Francisco Fabián | 1.477 | 1995 | |
| 21 | Michael Carter | 1.486 | 1986 | |
| 22 | Culley Briggs | 1.491 | 1968 | |
| 23 | Pat Allen | 1.504 | 1982 | |
| 24 | Bryce Daugherty | 1.516 | 1991 | |
| 25 | Raúl Valéncia | 1.518 | 1998 | |
| 26 | Salvador Olvera | 1.520 | 1991 | |
| 27 | Justin Emerson | 1.523 | 1964 | |
| 28 | Luigi Henderson# | 1.527 | 2005 | |
| 29 | Mark Santigo | 1.533 | 1992 | |
| 30 | Henry Henry | 1.535 | 1994 | |
| 31 | Jeff Meyer | 1.538 | 1988 | |
| 32 | Oliver Hernández | 1.555 | 1999 | |
| 33 | Ángel Rodríguez | 1.557 | 1997 | |
| 34 | Jonathan Jensen | 1.559 | 1993 | |
| 35 | Pat Wearmouth | 1.567 | 1964 | |
| 36 | Jonathan Jensen | 1.569 | 1994 | |
| 37 | Gonzalo Sánchez | 1.573 | 1993 | |
| 38 | Gavin Burns | 1.579 | 1995 | |
| 39 | Ron Dunlap# | 1.583 | 2007 | |
| 40 | Jonathan Collins | 1.596 | 1977 | |
| 41 | Austin Rose | 1.602 | 1995 | |
| 42 | António Herrera | 1.605 | 2000 | |
| 43 | Mario Morales | 1.611 | 2001 | |
| 44 | William Rutherford | 1.613 | 1973 | |
| 45 | Mario Guerra | 1.625 | 1997 | |
| 46 | Salvador Lópes | 1.627 | 1992 | |
| 47 | Bennett Murphy# | 1.631 | 2008 | |
| 48 | Ángel Hernández | 1.635 | 1987 | |
| 49 | Masayoshi Tsuchiya | 1.640 | 2010 | |
| 49 | Sam Neal# | 1.640 | 2006 | |
| 51 | Donald Howse# | 1.641 | 2015 | |
| 52 | Félix Brito# | 1.645 | 1997 | |
| 53 | Jesús Fernández# | 1.649 | 2010 | |
| 54 | Aaron Ward | 1.652 | 1994 | |
| 55 | Donald Richter# | 1.657 | 2011 | |
| 56 | Aaron Ward | 1.673 | 1990 | |
| 56 | Harvey Carroll | 1.673 | 1988 | |
| 58 | Scott May# | 1.688 | 2014 | |
| 59 | Ramón Santos | 1.691 | 1994 | |
| 59 | José Ocampo | 1.691 | 1996 | |
| 61 | Ernesto Luna | 1.692 | 1996 | |
| 62 | Ángel Candelária# | 1.694 | 2013 | |
| 63 | Brian Maldonado | 1.697 | 1997 | |
| 64 | Kelly Pierce | 1.699 | 1988 | |
| 65 | Pat Hawk | 1.708 | 1984 | |
| 66 | Andrew Dixon | 1.709 | 1975 | |
| 67 | Dave Ortega | 1.714 | 2000 | |
| 68 | António González | 1.715 | 1970 | |
| 69 | Don Parkinson | 1.723 | 1989 | |
| 70 | Juan Gabriel | 1.728 | 2000 | |
| 70 | Cristo Alvarado# | 1.728 | 1998 | |
| 72 | Herbert Gibbs | 1.731 | 1961 | |
| 73 | Edgardo Morín# | 1.734 | 2012 | |
| 74 | Joaquín Gines | 1.739 | 1992 | |
| 75 | Roberto Sepúlveda | 1.741 | 2003 | |
| 76 | Júlio Rodríguez | 1.744 | 1993 | |
| 76 | John Huntingford | 1.744 | 2000 | |
| 78 | Ze-min Wang | 1.745 | 1997 | |
| 79 | Paul Montgomery | 1.749 | 2008 | |
| 79 | Júlio Rodríguez | 1.749 | 1997 | |
| 81 | Flynn Carter | 1.750 | 1999 | |
| 82 | Ken Young | 1.752 | 1974 | |
| 83 | Roy Goodenough | 1.756 | 1989 | |
| 83 | Jorge Prado | 1.756 | 1998 | |
| 85 | Ira Bieber | 1.760 | 2002 | |
| 85 | Jeff Meyer | 1.760 | 1987 | |
| 87 | Bill Vélez | 1.773 | 2000 | |
| 88 | Bill Schultz | 1.781 | 1974 | |
| 89 | Pedro Navarro | 1.782 | 1994 | |
| 90 | Steve Putnam | 1.783 | 1971 | |
| 91 | José Ocampo | 1.784 | 1995 | |
| 91 | Héctor González | 1.784 | 2008 | |
| 91 | Eric Williams | 1.784 | 2002 | |
| 94 | Javier Estrada | 1.787 | 1999 | |
| 95 | Emmanuele Ricco | 1.788 | 2001 | |
| 96 | Mark Hickman | 1.789 | 2002 | |
| 97 | Eddie Wise | 1.790 | 1999 | |
| 98 | Mark Fulton | 1.791 | 1992 | |
| 99 | Javier Estrada | 1.792 | 1998 | |
| 100 | Kevin Tucker# | 1.793 | 2014 |
