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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Carlos Ruíz | 0.377 | 2012 | |
| 2 | Luis Fuentes | 0.675 | 2012 | |
| 3 | Ed Armstrong# | 0.747 | 2018 | |
| 4 | David Lawson | 0.761 | 2015 | |
| 5 | César Ramírez# | 0.862 | 2026 | |
| 6 | John Stewart | 0.894 | 2024 | |
| 7 | Juan Quezada# | 0.906 | 2026 | |
| 8 | Paul Johnston# | 0.968 | 2023 | |
| 9 | Tim Walker | 1.049 | 2017 | |
| 10 | Dave Murphy | 1.085 | 2018 | |
| 11 | Kurt Williams | 1.110 | 2021 | |
| 12 | Paul Johnston# | 1.118 | 2024 | |
| 13 | Marcos Marino# | 1.130 | 2022 | |
| 14 | Bob Ruíz# | 1.136 | 2022 | |
| 15 | Dan Thompson# | 1.152 | 2027 | |
| 16 | John Witt | 1.161 | 2025 | |
| 17 | Joe Black | 1.168 | 2022 | |
| 18 | Blake Orlando# | 1.196 | 2032 | |
| 19 | Jason Duncan# | 1.227 | 2024 | |
| 19 | Ray Weeks | 1.227 | 2019 | |
| 21 | Dylan Wilson# | 1.235 | 2024 | |
| 21 | Brad Williams | 1.235 | 2024 | |
| 23 | Juan Mendoza# | 1.246 | 2019 | |
| 23 | Carl Pollard# | 1.246 | 2021 | |
| 25 | Luis Hernández# | 1.249 | 2029 | |
| 26 | John Ketchum# | 1.260 | 2030 | |
| 27 | Tom O'Day# | 1.262 | 2013 | |
| 28 | Gonzalo Diéguez | 1.263 | 2020 | |
| 29 | César Orozco | 1.266 | 2021 | |
| 30 | Allen Cox# | 1.272 | 2020 | |
| 31 | Orlando Días# | 1.299 | 2019 | |
| 32 | Troy Lamb# | 1.331 | 2031 | |
| 33 | Raymond Riley# | 1.333 | 2027 | |
| 34 | Carlton Shafer | 1.337 | 2023 | |
| 35 | Alberto García# | 1.343 | 2028 | |
| 36 | Tom O'Day# | 1.344 | 2014 | |
| 37 | Chris Hastings | 1.356 | 2020 | |
| 38 | Ramón Castaneda | 1.357 | 2012 | |
| 38 | Ed Armstrong# | 1.357 | 2019 | |
| 40 | Ed Armstrong# | 1.362 | 2016 | |
| 41 | Dave Hamm# | 1.381 | 2028 | |
| 42 | Wilbert Hill | 1.385 | 2019 | |
| 43 | Tomás Bravo# | 1.394 | 2020 | |
| 44 | John Slater | 1.414 | 2017 | |
| 45 | Michael Burton | 1.421 | 2015 | |
| 45 | Jonathan Clark | 1.421 | 2015 | |
| 45 | Carlos Ruíz | 1.421 | 2014 | |
| 45 | Bob Doss | 1.421 | 2023 | |
| 49 | John Holmes# | 1.428 | 2022 | |
| 50 | Garry Strode# | 1.435 | 2025 | |
| 51 | José Contreras | 1.436 | 2013 | |
| 52 | Howard Downey# | 1.440 | 2030 | |
| 53 | Garry Strode# | 1.446 | 2024 | |
| 54 | Bob Cornelsen# | 1.450 | 2032 | |
| 55 | Eliot Moreau# | 1.463 | 2019 | |
| 56 | Vincenzo Rizzoli# | 1.467 | 2028 | |
| 57 | Vicente Valenzuela# | 1.473 | 2024 | |
| 58 | Elias Bowen# | 1.478 | 2023 | |
| 59 | Paul Hicks | 1.482 | 2026 | |
| 60 | John Grubb | 1.485 | 2012 | |
| 61 | Dennis McKenzie | 1.490 | 2029 | |
| 62 | Paul Johnston# | 1.500 | 2022 | |
| 63 | José Delgado | 1.508 | 2013 | |
| 63 | Steve Garrett | 1.508 | 2013 | |
| 65 | Danny Cook# | 1.519 | 2032 | |
| 66 | Carlton Shafer | 1.528 | 2024 | |
| 67 | Bruce Lowe# | 1.533 | 2016 | |
| 68 | George Bedford | 1.536 | 2019 | |
| 69 | Dylan Wilson# | 1.552 | 2025 | |
| 70 | Rod Crowe | 1.558 | 2016 | |
| 71 | Steve Ferguson# | 1.561 | 2025 | |
| 72 | Dennis McKenzie | 1.570 | 2027 | |
| 73 | António Navarro# | 1.574 | 2016 | |
| 74 | Elias Bowen# | 1.579 | 2024 | |
| 75 | Matt Logan | 1.599 | 2028 | |
| 76 | António Medrano# | 1.612 | 2021 | |
| 77 | Lee Krause# | 1.620 | 2030 | |
| 78 | Raúl Flores# | 1.627 | 2023 | |
| 79 | James Phillips | 1.646 | 2013 | |
| 80 | Nate Chapman# | 1.650 | 2023 | |
| 81 | Eduardo Marino# | 1.653 | 2023 | |
| 81 | Manuel Crespo# | 1.653 | 2020 | |
| 83 | Júlio Costello | 1.667 | 2021 | |
| 84 | Anthony Gary | 1.670 | 2020 | |
| 85 | Reggie Casteel# | 1.677 | 2030 | |
| 86 | Dan Edwards# | 1.688 | 2023 | |
| 86 | Ray Thompson | 1.688 | 2013 | |
| 88 | Rob Young | 1.695 | 2014 | |
| 89 | Adam Sullivan# | 1.699 | 2032 | |
| 90 | Tae-ho Yi | 1.704 | 2021 | |
| 91 | Steve Burton# | 1.707 | 2027 | |
| 92 | Don Boyce | 1.709 | 2028 | |
| 93 | Mike Steveson# | 1.711 | 2030 | |
| 94 | Juan Mendoza# | 1.712 | 2018 | |
| 94 | Bill Baker | 1.712 | 2013 | |
| 96 | Philip Smith | 1.720 | 2023 | |
| 97 | Rubén Cabrera# | 1.721 | 2023 | |
| 98 | Alberto García# | 1.727 | 2026 | |
| 99 | Dylan Wilson# | 1.737 | 2022 | |
| 99 | Manuel García | 1.737 | 2018 |
