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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Stanley Williams# | 2.408 | 2016 | |
| 2 | Alonso Rodríguez# | 3.682 | 2016 | |
| 3 | Jesús Gonzáles# | 3.732 | 2017 | |
| 4 | Paul Nance# | 3.876 | 2016 | |
| 5 | Homer Shafer# | 3.981 | 2017 | |
| 6 | Clay Clark# | 4.036 | 2016 | |
| 7 | Bob Warford# | 4.111 | 2017 | |
| 8 | Luis Fernández# | 4.281 | 2016 | |
| 9 | Alonso Rodríguez# | 4.380 | 2015 | |
| 10 | Richard Meyer# | 4.513 | 2017 | |
| 11 | Jimmy Wilson# | 4.535 | 2017 | |
| 12 | Ray Thibaut# | 4.636 | 2017 | |
| 13 | Brent Riley# | 4.641 | 2017 | |
| 14 | Robert Byrd# | 4.711 | 2017 | |
| 15 | Wilson Vélez# | 4.784 | 2016 | |
| 16 | César Díaz# | 4.835 | 2017 | |
| 17 | Thomas Owens# | 4.855 | 2017 | |
| 18 | Alonso Rodríguez# | 4.861 | 2017 | |
| 19 | Tim Holmes# | 4.946 | 2016 | |
| 20 | Clay Clark# | 5.053 | 2017 | |
| 21 | Andrés Martínez# | 5.108 | 2017 | |
| 22 | Pancho Vargas# | 5.137 | 2016 | |
| 23 | Artie Taylor# | 5.221 | 2017 | |
| 24 | Elvin Brooks# | 5.481 | 2016 | |
| 25 | Armanno Salutari# | 5.537 | 2015 | |
| 26 | Art Adams# | 5.578 | 2016 | |
| 27 | Alfredo Torres# | 5.664 | 2015 | |
| 28 | Jeffrey Chase# | 5.771 | 2017 | |
| 29 | José Rodríguez# | 5.944 | 2017 | |
| 30 | Andrés Martínez# | 5.965 | 2016 | |
| 31 | Josh Gardner# | 6.170 | 2017 | |
| 32 | Allen Wilson# | 6.261 | 2017 | |
| 33 | Anthony Graham# | 6.270 | 2017 | |
| 34 | John Stone# | 6.294 | 2017 | |
| 35 | Garland Holt# | 6.570 | 2015 | |
| 36 | Álex Padilla# | 6.730 | 2017 | |
| 37 | Billy Bruce# | 7.015 | 2017 | |
| 38 | Shawn Arnold# | 7.242 | 2016 | |
| 39 | Iván Castillo# | 7.613 | 2017 |
