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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Richard Brown# | 3.749 | 2015-2019 | |
| 2 | Jorge Rivas# | 3.758 | 2017-2019 | |
| 3 | Leroy Picot# | 3.959 | 2018-2019 | |
| 4 | John Shirley# | 3.977 | 2018-2019 | |
| 5 | Paul Nance# | 4.045 | 2015-2016 | |
| 6 | Stanley Williams# | 4.056 | 2015-2016 | |
| 7 | José Ramírez# | 4.093 | 2015-2019 | |
| 8 | Wally Wilkerson# | 4.141 | 2018-2019 | |
| 9 | Miguel López# | 4.146 | 2015-2018 | |
| 10 | Clay Clark# | 4.300 | 2015-2018 | |
| 11 | John Boyle# | 4.310 | 2017-2019 | |
| 12 | Manuel Ortíz# | 4.334 | 2016-2019 | |
| 13 | Luis Fernández# | 4.355 | 2015-2016 | |
| 14 | Homer Shafer# | 4.414 | 2015-2019 | |
| 15 | Paul Abbott# | 4.491 | 2016-2019 | |
| 16 | Alonso Rodríguez# | 4.515 | 2015-2019 | |
| 17 | Teddy Jones# | 4.541 | 2017-2019 | |
| 18 | Robert Byrd# | 4.545 | 2017-2019 | |
| 19 | Wilson Vélez# | 4.560 | 2016-2019 | |
| 20 | Greg Kelly# | 4.568 | 2016-2019 | |
| 21 | Bob McGhee# | 4.673 | 2015-2019 | |
| 22 | Brent Riley# | 4.689 | 2015-2019 | |
| 23 | Artie Taylor# | 4.736 | 2017-2018 | |
| 24 | Tim Holmes | 4.851 | 2015-2016 | |
| 25 | Phil Frost# | 4.863 | 2016-2019 | |
| 26 | Ray Thibaut# | 4.866 | 2015-2019 | |
| 27 | Louis McDowell# | 4.875 | 2015-2018 | |
| 28 | José Salinas# | 4.890 | 2018-2019 | |
| 29 | Doug Green# | 4.973 | 2018-2019 | |
| 30 | Jimmy Wilson# | 5.010 | 2016-2017 | |
| 31 | Branislav Stankovic# | 5.040 | 2016-2019 | |
| 32 | José Trujillo# | 5.041 | 2016-2019 | |
| 33 | Bob Warford# | 5.046 | 2017-2018 | |
| 34 | Ayres Valido# | 5.052 | 2015-2019 | |
| 35 | Homer O'Lannigan# | 5.229 | 2018-2019 | |
| 36 | Emory Bryant# | 5.233 | 2015-2019 | |
| 37 | Freddy González# | 5.254 | 2015-2019 | |
| 38 | John Ashley# | 5.258 | 2017-2019 | |
| 39 | Nick Blount# | 5.265 | 2016-2019 | |
| 40 | Tom Hernández# | 5.287 | 2016-2019 | |
| 41 | Josh Gardner# | 5.338 | 2017-2019 | |
| 42 | Anthony Hanover# | 5.358 | 2016-2019 | |
| 43 | Anthony Graham# | 5.370 | 2017-2019 | |
| 44 | Luis Oliva# | 5.459 | 2017-2019 | |
| 45 | Nick Taylor# | 5.467 | 2015-2019 | |
| 46 | Dan Boyle# | 5.472 | 2015-2019 | |
| 47 | Elvin Brooks# | 5.482 | 2015-2017 | |
| 48 | Andrés Martínez# | 5.501 | 2016-2017 | |
| 49 | Gregory Gary# | 5.514 | 2015-2017 | |
| 50 | Steven Williams# | 5.532 | 2015-2019 | |
| 51 | Andrew Hayes# | 5.541 | 2016-2019 | |
| 52 | Garland Holt | 5.559 | 2015-2017 | |
| 53 | Mackenzie Bolen# | 5.598 | 2015-2018 | |
| 54 | Jeff Mayer# | 5.617 | 2018-2019 | |
| 55 | Christian Walsh# | 5.618 | 2017-2019 | |
| 56 | Doruk Oyan# | 5.660 | 2015-2019 | |
| 57 | Hubert Dunham# | 5.673 | 2016-2019 | |
| 58 | Rafael Chávez# | 5.767 | 2015-2016 | |
| 59 | Pancho Vargas# | 5.790 | 2015-2019 | |
| 60 | Jesús López# | 5.798 | 2016-2019 | |
| 61 | Samuel Hawkins# | 5.843 | 2015-2018 | |
| 62 | Norberto Ramírez | 5.844 | 2015-2017 | |
| 63 | José Rodríguez# | 5.860 | 2015-2019 | |
| 64 | Jeffrey Chase# | 5.887 | 2017-2018 | |
| 65 | Mark Tucker# | 5.932 | 2017-2019 | |
| 66 | Neal Cosman | 5.965 | 2015-2017 | |
| 67 | Juan López# | 5.985 | 2017-2018 | |
| 68 | Allen Wilson# | 6.032 | 2016-2017 | |
| 69 | Louis Webber# | 6.070 | 2016-2019 | |
| 70 | Justin Jamerson# | 6.179 | 2015-2019 | |
| 71 | Woody Carlson# | 6.204 | 2018-2019 | |
| 72 | Alfredo Torres# | 6.260 | 2015-2019 | |
| 73 | Brad Wilson# | 6.268 | 2015-2019 | |
| 74 | Jim Mitford# | 6.356 | 2016-2017 | |
| 75 | Eric Patnode# | 6.415 | 2016-2019 | |
| 76 | César García# | 6.489 | 2016-2018 | |
| 77 | Frank Simmons# | 6.667 | 2018-2019 | |
| 78 | Billy Bruce# | 6.722 | 2017-2018 | |
| 79 | Javier Hernández# | 6.729 | 2015-2019 | |
| 80 | John Stone# | 6.750 | 2015-2018 | |
| 81 | John Adams# | 6.880 | 2016-2019 | |
| 82 | Xavier Andrade# | 6.892 | 2017-2019 | |
| 83 | Dave Mitchell# | 6.904 | 2017-2019 | |
| 83 | Michael Fields# | 6.904 | 2015-2019 | |
| 85 | Oliver Bottcher# | 6.976 | 2015-2019 | |
| 86 | Álex Padilla# | 7.492 | 2017-2018 | |
| 87 | Iván Castillo# | 7.536 | 2015-2018 | |
| 88 | Vernon Turner# | 7.772 | 2018-2019 | |
| 89 | Bill Muńóz# | 7.787 | 2015-2019 |
