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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Carlos Ruíz | 1.46 | 2012-2015 | |
| 1 | Ed Armstrong# | 1.46 | 2016-2019 | |
| 3 | Eliot Moreau# | 2.11 | 2018-2021 | |
| 4 | John Stroud# | 2.18 | 2017-2020 | |
| 5 | John Slater | 2.26 | 2014-2017 | |
| 6 | Tom O'Day# | 2.41 | 2012-2016 | |
| 7 | Jorge López | 2.42 | 2018-2021 | |
| 8 | Howard Poole | 2.48 | 2016-2019 | |
| 9 | Aaron Taylor | 2.49 | 2012-2015 | |
| 10 | Will Caron# | 2.50 | 2018-2021 | |
| 11 | Ray Weeks | 2.51 | 2016-2019 | |
| 12 | John Jones | 2.56 | 2012-2016 | |
| 13 | Kevin Landry | 2.57 | 2012-2015 | |
| 14 | Bob Doss | 2.59 | 2022-2025 | |
| 15 | Manuel García | 2.60 | 2017-2020 | |
| 16 | António Navarro# | 2.65 | 2016-2019 | |
| 17 | William Kramer | 2.68 | 2022-2025 | |
| 18 | Michael Moyer# | 2.82 | 2018-2021 | |
| 18 | Richard Rogers | 2.82 | 2012-2016 | |
| 20 | Chris Hastings | 2.83 | 2017-2020 | |
| 21 | Rob Young | 2.85 | 2012-2015 | |
| 22 | Ruberto Laranjeira | 2.98 | 2017-2020 | |
| 23 | Jonathan Martin# | 3.00 | 2012-2015 | |
| 24 | Bob Hill | 3.02 | 2016-2019 | |
| 25 | William Howard | 3.08 | 2012-2015 | |
| 26 | Félix Ortíz | 3.10 | 2012-2015 | |
| 26 | Gabriel Núñez# | 3.10 | 2018-2021 | |
| 28 | Anthony McIntyre# | 3.13 | 2017-2020 | |
| 29 | Jesús Feliciano | 3.14 | 2012-2015 | |
| 30 | Ed Lott | 3.19 | 2012-2015 | |
| 31 | Jason Davis | 3.23 | 2015-2018 | |
| 32 | Eric Edwards | 3.29 | 2016-2019 | |
| 33 | Paul Wise | 3.33 | 2016-2019 | |
| 33 | Jeffrey Allison | 3.33 | 2015-2018 | |
| 35 | Chris Johnson | 3.35 | 2018-2021 | |
| 36 | Bill Barnes | 3.37 | 2017-2020 | |
| 37 | Rod Crowe | 3.42 | 2015-2018 | |
| 38 | Bill George | 3.48 | 2016-2019 | |
| 39 | Jesús Ramírez | 3.51 | 2012-2015 | |
| 40 | Ken Lutz | 3.52 | 2017-2020 | |
| 41 | Bryan Peterson | 3.53 | 2012-2016 | |
| 42 | Carlos Díaz | 3.59 | 2012-2015 | |
| 43 | Aaron Simmons | 3.65 | 2012-2015 | |
| 44 | Tony Baltiérrez | 3.68 | 2015-2018 | |
| 45 | Richard Stevenson | 3.70 | 2012-2015 | |
| 46 | Craig Cameron | 3.71 | 2017-2020 | |
| 47 | Jim Lyons | 3.73 | 2012-2015 | |
| 48 | Stephen Harding | 3.74 | 2016-2019 | |
| 49 | Luis Martínez | 3.75 | 2016-2019 | |
| 50 | Larry Anderson | 3.77 | 2012-2015 | |
| 51 | Randall Stevenson | 3.86 | 2017-2020 | |
| 52 | Jim Hall | 3.87 | 2012-2015 | |
| 53 | Joe Conway | 3.92 | 2012-2016 | |
| 54 | Jon Morris | 3.93 | 2015-2018 | |
| 55 | Pedro Díaz | 3.96 | 2012-2016 | |
| 56 | José Espinosa | 3.99 | 2021-2024 | |
| 57 | Nazeli Salatinian | 4.00 | 2017-2020 | |
| 57 | Gustavo Sánchez | 4.00 | 2016-2019 | |
| 59 | Stan Bond | 4.12 | 2016-2019 | |
| 60 | Jesús Castillo | 4.17 | 2015-2018 | |
| 61 | Robinson García | 4.23 | 2012-2016 | |
| 62 | Lewis Hunter | 4.27 | 2014-2017 | |
| 63 | Cliff Smith | 4.35 | 2012-2016 | |
| 64 | Theodore Foster | 4.40 | 2012-2015 | |
| 65 | Jake Robinson | 4.48 | 2012-2016 | |
| 66 | Juan García | 4.55 | 2015-2018 | |
| 67 | Luis Peña | 4.60 | 2016-2019 | |
| 68 | Troy Davis | 4.73 | 2012-2016 | |
| 69 | Jude Anderson | 4.77 | 2016-2019 | |
| 70 | Manuel Zambrano | 4.85 | 2012-2015 | |
| 71 | Leon Hemphill | 4.93 | 2017-2020 | |
| 72 | Iván Santos | 4.99 | 2012-2015 | |
| 73 | Arthur Trail | 5.23 | 2015-2018 | |
| 73 | Will Wood | 5.23 | 2012-2016 | |
| 75 | Sandy Carey | 5.99 | 2012-2015 |
