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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Pedro Martínez# | 2.250 | 2047 | |
| 2 | Max Miller | 2.538 | 2009 | |
| 3 | Rob Price | 2.668 | 2012 | |
| 4 | José Medellín | 2.689 | 2033 | |
| 5 | Hyo-chin Ch'oe | 2.714 | 2022 | |
| 6 | Ron Robertson | 2.723 | 2008 | |
| 7 | José Martínez# | 2.772 | 2046 | |
| 8 | Andy Wall# | 2.816 | 2048 | |
| 9 | Cris Rincón | 2.836 | 2015 | |
| 10 | Lorenzo Sánchez | 2.873 | 2025 | |
| 11 | Ramón Ruíz | 2.908 | 2019 | |
| 12 | Keith Palmer | 2.929 | 2044 | |
| 13 | Michael Melsom# | 2.949 | 2049 | |
| 14 | Holden Leonard# | 3.007 | 2049 | |
| 15 | Ernesto Durán | 3.015 | 2010 | |
| 16 | Javier Encarnación | 3.035 | 2013 | |
| 17 | John Peters | 3.057 | 2015 | |
| 18 | Mike Gibson# | 3.068 | 2049 | |
| 19 | Justin Terry | 3.076 | 2010 | |
| 20 | Nam-cheol Chong | 3.078 | 2009 | |
| 21 | Ray Doyle# | 3.079 | 2048 | |
| 22 | Ángel Rodríguez | 3.084 | 2014 | |
| 23 | Juan Mancina# | 3.090 | 2046 | |
| 23 | Eduardo Trujillo | 3.090 | 2020 | |
| 25 | Millard Murphy# | 3.100 | 2048 | |
| 26 | Pedro Juárez# | 3.138 | 2043 | |
| 27 | Eugene Moore# | 3.141 | 2044 | |
| 28 | Ángel Rodríguez | 3.146 | 2015 | |
| 29 | Matt Parker | 3.161 | 2031 | |
| 30 | Ivo Estima | 3.173 | 2015 | |
| 31 | Octávio Garza | 3.179 | 2015 | |
| 32 | John Hopkins# | 3.202 | 2041 | |
| 33 | Yoo-chul Yi | 3.228 | 2012 | |
| 34 | Bernie Snow# | 3.249 | 2039 | |
| 35 | Marcos Flores | 3.266 | 2031 | |
| 36 | Tom Beaty | 3.271 | 2046 | |
| 36 | José Mercado | 3.271 | 2008 | |
| 38 | Cristóbal Gómez | 3.282 | 2019 | |
| 39 | Jorge Ruíz | 3.296 | 2026 | |
| 40 | Alfonso Medina | 3.301 | 2020 | |
| 41 | Kenny Melton | 3.307 | 2045 | |
| 42 | Wang Han | 3.317 | 2011 | |
| 43 | Tom Miller# | 3.318 | 2047 | |
| 44 | Ron Robertson | 3.336 | 2007 | |
| 44 | José Medellín | 3.336 | 2032 | |
| 46 | Derek Simpson | 3.337 | 2024 | |
| 47 | Stanley Inman | 3.348 | 2035 | |
| 48 | Edward Baker | 3.358 | 2024 | |
| 49 | Dae-ik Kim | 3.360 | 2009 | |
| 50 | Mike Stuart | 3.369 | 2012 | |
| 51 | Tim Chambers | 3.381 | 2008 | |
| 52 | Jimmy Sanders | 3.400 | 2007 | |
| 53 | Félix Medina | 3.402 | 2025 | |
| 54 | Rob Price | 3.408 | 2010 | |
| 55 | Eugene Moore# | 3.411 | 2045 | |
| 56 | Carlos Castillo | 3.424 | 2010 | |
| 57 | William Taylor# | 3.426 | 2049 | |
| 58 | Steve Meyer# | 3.431 | 2047 | |
| 59 | Errol Murphy | 3.439 | 2030 | |
| 59 | Jerry Paige | 3.439 | 2012 | |
| 61 | José Mercado | 3.449 | 2011 | |
| 62 | Javier Baguiñón# | 3.453 | 2046 | |
| 62 | Mark Watson | 3.453 | 2042 | |
| 64 | Tim Chapman# | 3.457 | 2047 | |
| 65 | Salvador Castro* | 3.466 | 2027 | |
| 66 | Jing-xiang Fa | 3.470 | 2022 | |
| 67 | José Hernández | 3.474 | 2033 | |
| 68 | Randy Ellison | 3.480 | 2011 | |
| 69 | John Peters | 3.486 | 2013 | |
| 70 | Ralph Wilhelm# | 3.493 | 2048 | |
| 71 | Dave Langley | 3.510 | 2009 | |
| 72 | Thom Long# | 3.514 | 2045 | |
| 72 | Jason Young# | 3.514 | 2046 | |
| 74 | Jorge Jiménez | 3.517 | 2026 | |
| 75 | Ken Gary | 3.522 | 2025 | |
| 76 | Octávio Garza | 3.537 | 2018 | |
| 77 | Nicodemo Forth# | 3.538 | 2048 | |
| 78 | David Miller | 3.540 | 2009 | |
| 79 | José Martínez | 3.541 | 2041 | |
| 80 | Manuel Guel | 3.554 | 2035 | |
| 80 | David Morgan# | 3.554 | 2049 | |
| 82 | John Peters | 3.558 | 2014 | |
| 83 | Claudio Romero | 3.561 | 2033 | |
| 84 | James O'Keenan | 3.563 | 2044 | |
| 85 | Pedro Oliveira | 3.565 | 2010 | |
| 86 | Eugene Moore# | 3.574 | 2047 | |
| 87 | Dave Menke# | 3.581 | 2049 | |
| 88 | Alex Shafer# | 3.607 | 2047 | |
| 89 | Tony Ryan | 3.608 | 2043 | |
| 90 | António Ruíz | 3.613 | 2032 | |
| 91 | Wilson Boyd# | 3.620 | 2048 | |
| 92 | António Ruíz | 3.622 | 2041 | |
| 93 | Dave Lewis | 3.635 | 2019 | |
| 94 | Paul Green# | 3.644 | 2048 | |
| 95 | Carlos Ruíz | 3.650 | 2021 | |
| 96 | Octávio Garza | 3.655 | 2019 | |
| 97 | Héctor García# | 3.668 | 2046 | |
| 98 | Don Woods# | 3.672 | 2048 | |
| 99 | Justin Hubbard# | 3.677 | 2047 | |
| 100 | Román Castillo | 3.682 | 2017 |
