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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Richard Brown# | 3.878 | 2015-2017 | |
| 2 | Emory Bryant# | 3.942 | 2015-2017 | |
| 3 | Paul Nance# | 4.045 | 2015-2016 | |
| 4 | Stanley Williams# | 4.056 | 2015-2016 | |
| 5 | José Vázquez# | 4.104 | 2015-2017 | |
| 6 | Bob Warford# | 4.111 | 2017-2017 | |
| 7 | Alonso Rodríguez# | 4.292 | 2015-2017 | |
| 8 | Morris Nicholson# | 4.294 | 2015-2016 | |
| 9 | Alex Sullivan# | 4.349 | 2015-2017 | |
| 10 | Luis Fernández# | 4.355 | 2015-2016 | |
| 11 | Clay Clark# | 4.373 | 2015-2017 | |
| 12 | Miguel López# | 4.449 | 2015-2017 | |
| 13 | Norm Burris# | 4.476 | 2016-2017 | |
| 14 | Richard Meyer# | 4.513 | 2017-2017 | |
| 15 | Ray Thibaut# | 4.586 | 2015-2017 | |
| 16 | Homer Shafer# | 4.605 | 2015-2017 | |
| 17 | Robert Byrd# | 4.711 | 2017-2017 | |
| 18 | Wilson Vélez# | 4.784 | 2016-2016 | |
| 19 | Freddy González# | 4.794 | 2015-2017 | |
| 20 | César Díaz# | 4.835 | 2017-2017 | |
| 21 | Tim Holmes# | 4.851 | 2015-2016 | |
| 22 | Pancho Vargas# | 4.882 | 2015-2016 | |
| 23 | Brent Riley# | 4.899 | 2015-2017 | |
| 24 | Mackenzie Bolen# | 4.909 | 2015-2017 | |
| 25 | Jimmy Wilson# | 5.010 | 2016-2017 | |
| 26 | Octávio Rodríguez# | 5.086 | 2015-2017 | |
| 27 | Anthony Hanover# | 5.104 | 2016-2017 | |
| 28 | Jesús Gonzáles# | 5.129 | 2016-2017 | |
| 29 | Graig Bell# | 5.164 | 2015-2017 | |
| 30 | Clint McGreer# | 5.207 | 2015-2017 | |
| 31 | Artie Taylor# | 5.221 | 2017-2017 | |
| 32 | Branislav Stankovic# | 5.245 | 2016-2017 | |
| 33 | Steven Williams# | 5.429 | 2015-2017 | |
| 34 | Ayres Valido# | 5.446 | 2015-2017 | |
| 35 | Elvin Brooks# | 5.482 | 2015-2017 | |
| 36 | Andrés Martínez# | 5.501 | 2016-2017 | |
| 37 | Gregory Gary# | 5.514 | 2015-2017 | |
| 38 | Samuel Hawkins# | 5.553 | 2015-2017 | |
| 39 | Dan Boyle# | 5.556 | 2015-2017 | |
| 40 | Garland Holt# | 5.559 | 2015-2017 | |
| 41 | Armanno Salutari# | 5.665 | 2015-2016 | |
| 42 | Nick Blount# | 5.678 | 2016-2017 | |
| 43 | Rafael Chávez# | 5.767 | 2015-2016 | |
| 44 | Jeffrey Chase# | 5.771 | 2017-2017 | |
| 45 | Thomas Owens# | 5.788 | 2015-2017 | |
| 46 | Joe Trujillo# | 5.812 | 2015-2017 | |
| 47 | Norberto Ramírez# | 5.844 | 2015-2017 | |
| 48 | Iván Román# | 5.955 | 2016-2017 | |
| 49 | Neal Cosman# | 5.965 | 2015-2017 | |
| 50 | Allen Wilson# | 6.032 | 2016-2017 | |
| 51 | Art Adams# | 6.130 | 2015-2016 | |
| 52 | Josh Gardner# | 6.170 | 2017-2017 | |
| 53 | Alfredo Torres# | 6.174 | 2015-2017 | |
| 54 | Anthony Graham# | 6.270 | 2017-2017 | |
| 55 | Blake Smith# | 6.319 | 2015-2017 | |
| 56 | Jim Mitford# | 6.356 | 2016-2017 | |
| 57 | Josh Cox# | 6.403 | 2015-2016 | |
| 58 | Ken Carter# | 6.437 | 2015-2016 | |
| 59 | José Rodríguez# | 6.529 | 2015-2017 | |
| 60 | Brad Wilson# | 6.539 | 2015-2017 | |
| 61 | Warren Roberts# | 6.583 | 2016-2017 | |
| 62 | Eric Patnode# | 6.674 | 2016-2017 | |
| 63 | Álex Padilla# | 6.730 | 2017-2017 | |
| 64 | Billy Bruce# | 7.015 | 2017-2017 | |
| 65 | Shawn Arnold# | 7.017 | 2015-2016 | |
| 66 | Justin Jamerson# | 7.126 | 2015-2017 | |
| 67 | John Stone# | 7.130 | 2015-2017 | |
| 68 | Michael Fields# | 7.284 | 2015-2017 | |
| 69 | César García# | 7.521 | 2016-2017 | |
| 70 | Iván Castillo# | 7.525 | 2015-2017 | |
| 71 | Javier Hernández# | 8.080 | 2015-2017 | |
| 72 | Bill Muńóz# | 8.650 | 2015-2017 |
