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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Hallinan Udny# | 2.109 | 2017 | |
| 2 | Jorge Candelária | 2.611 | 2016 | |
| 3 | Javier López# | 2.763 | 2018 | |
| 4 | Allen Yohemas# | 2.851 | 2019 | |
| 5 | Richard Allison# | 2.863 | 2016 | |
| 6 | Miguel González# | 2.932 | 2017 | |
| 7 | Morgan MacDonald# | 3.096 | 2019 | |
| 8 | Miguel Mora# | 3.173 | 2018 | |
| 9 | Domingo Álvarez# | 3.190 | 2019 | |
| 10 | Stewart Walker# | 3.251 | 2016 | |
| 11 | Miguel Mora# | 3.318 | 2017 | |
| 12 | Miguel González# | 3.344 | 2016 | |
| 13 | Neil Gilliam# | 3.403 | 2018 | |
| 14 | Don Miller# | 3.404 | 2019 | |
| 15 | John Buck# | 3.412 | 2017 | |
| 16 | Elroy Gardner# | 3.453 | 2018 | |
| 17 | Tom Jones# | 3.458 | 2018 | |
| 18 | Michael Logan# | 3.496 | 2019 | |
| 19 | Tom Jones# | 3.626 | 2016 | |
| 20 | Javier Mora# | 3.682 | 2018 | |
| 21 | Sabino Ramírez | 3.693 | 2017 | |
| 22 | José Granados# | 3.713 | 2019 | |
| 23 | Fernando Reyna# | 3.762 | 2016 | |
| 24 | Rick Mayer# | 3.799 | 2019 | |
| 25 | Cole Johnson# | 3.845 | 2015 | |
| 26 | Elroy Gardner# | 3.877 | 2017 | |
| 27 | John Buck# | 3.889 | 2016 | |
| 28 | Javier Penela# | 3.892 | 2018 | |
| 29 | Emílio Zaragoza# | 3.935 | 2018 | |
| 30 | Jeremy Petty# | 3.963 | 2019 | |
| 31 | Miguel Mora# | 3.965 | 2016 | |
| 32 | Lawrence Bignold# | 3.979 | 2017 | |
| 33 | R.J. Good# | 3.994 | 2017 | |
| 33 | Cipriano Costa# | 3.994 | 2019 | |
| 35 | Francisco López# | 3.998 | 2018 | |
| 36 | Jeff Moore# | 4.030 | 2016 | |
| 37 | Javier Penela# | 4.040 | 2017 | |
| 38 | Javier López# | 4.114 | 2017 | |
| 39 | Júlio Hernández# | 4.126 | 2019 | |
| 40 | Juan Núñez# | 4.169 | 2016 | |
| 40 | Devin Federith# | 4.169 | 2018 | |
| 42 | Lawrence Bignold# | 4.242 | 2018 | |
| 43 | Craig Fawsyde# | 4.249 | 2018 | |
| 44 | Tony Cherena# | 4.305 | 2016 | |
| 45 | Tony Cherena# | 4.308 | 2015 | |
| 46 | Don Miller# | 4.318 | 2018 | |
| 47 | Craig Fawsyde# | 4.338 | 2016 | |
| 48 | António Aguilar# | 4.351 | 2017 | |
| 49 | Sam Rollins# | 4.359 | 2019 | |
| 50 | Joaquín Soto# | 4.408 | 2018 | |
| 51 | Paco López# | 4.412 | 2015 | |
| 52 | Júlio Hernández# | 4.418 | 2015 | |
| 53 | Raúl Pérez# | 4.463 | 2016 | |
| 54 | Bruno Gould# | 4.465 | 2019 | |
| 55 | Alberto Seguillo# | 4.490 | 2017 | |
| 56 | René Martínez# | 4.522 | 2016 | |
| 57 | Juan Núñez# | 4.541 | 2018 | |
| 58 | Júlio Hernández# | 4.594 | 2017 | |
| 59 | Fernando Peralta# | 4.596 | 2019 | |
| 60 | Pedro Valdéz# | 4.597 | 2018 | |
| 61 | Joe Kehoe# | 4.605 | 2016 | |
| 62 | Carlos Sánchez# | 4.620 | 2016 | |
| 63 | Jack King# | 4.623 | 2017 | |
| 64 | Austin Abbott# | 4.631 | 2017 | |
| 65 | Alfonso Zapata# | 4.647 | 2019 | |
| 66 | Jorge Torres | 4.712 | 2015 | |
| 67 | Morgan MacDonald# | 4.721 | 2018 | |
| 68 | Bill Washington# | 4.743 | 2018 | |
| 69 | Juan Núñez# | 4.789 | 2017 | |
| 70 | Paul Stuart# | 4.828 | 2019 | |
| 71 | Francisco López# | 4.837 | 2017 | |
| 72 | Javier Penela# | 4.840 | 2015 | |
| 73 | Terry Dwyer# | 4.851 | 2015 | |
| 74 | Il-gyung Kim# | 4.899 | 2017 | |
| 75 | Alex Simmons# | 4.902 | 2016 | |
| 76 | Jeremy Petty# | 4.923 | 2018 | |
| 77 | Joaquín Soto# | 4.959 | 2019 | |
| 78 | John Fowler# | 5.009 | 2019 | |
| 79 | Jeff Moore# | 5.011 | 2015 | |
| 80 | Kevin Porter# | 5.012 | 2019 | |
| 81 | John Tanner# | 5.047 | 2017 | |
| 82 | Joe Ellis# | 5.057 | 2015 | |
| 83 | Sam MacKerras# | 5.106 | 2017 | |
| 84 | Juan Correa# | 5.121 | 2015 | |
| 85 | Luis Castrejón# | 5.140 | 2019 | |
| 86 | Fred Pitts# | 5.172 | 2016 | |
| 87 | Michael McGinnity# | 5.211 | 2015 | |
| 88 | Tim Nelson# | 5.212 | 2017 | |
| 89 | John Tanner# | 5.213 | 2016 | |
| 90 | Bill Washington# | 5.262 | 2019 | |
| 91 | Nathaniel Riley# | 5.272 | 2015 | |
| 92 | Richard Allison# | 5.291 | 2015 | |
| 93 | Alberto Seguillo# | 5.302 | 2018 | |
| 94 | Francisco Barrera# | 5.311 | 2019 | |
| 95 | Devin Federith# | 5.327 | 2017 | |
| 96 | Cristóbal Cardona# | 5.332 | 2017 | |
| 97 | Manuel Romero# | 5.383 | 2019 | |
| 98 | Pat Brown# | 5.400 | 2018 | |
| 99 | Gustavo Pérez# | 5.452 | 2019 | |
| 100 | Jorge Silverstro# | 5.473 | 2016 |
