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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 | Tony Perkis# | 0.839 | 2046 | |
| 5 | Juan Quezada | 0.906 | 2026 | |
| 6 | Paul Johnston | 0.968 | 2023 | |
| 7 | Tim Walker | 1.049 | 2017 | |
| 8 | Dave Murphy | 1.085 | 2018 | |
| 9 | Jon Snyder | 1.095 | 2039 | |
| 10 | Kurt Williams | 1.110 | 2021 | |
| 11 | Paul Johnston | 1.118 | 2024 | |
| 12 | Justin Hornick# | 1.125 | 2056 | |
| 13 | Marcos Marino | 1.130 | 2022 | |
| 14 | Bob Ruíz | 1.136 | 2022 | |
| 15 | Bruce Berardi | 1.157 | 2031 | |
| 16 | J.R. Hepner# | 1.174 | 2049 | |
| 17 | Jason Duncan | 1.227 | 2024 | |
| 17 | Ray Weeks | 1.227 | 2019 | |
| 19 | Dylan Wilson | 1.235 | 2024 | |
| 20 | Juan Mendoza | 1.246 | 2019 | |
| 21 | John Ketchum | 1.260 | 2030 | |
| 22 | Tom O'Day | 1.262 | 2013 | |
| 23 | Gonzalo Diéguez | 1.263 | 2020 | |
| 24 | Allen Cox | 1.272 | 2020 | |
| 25 | Doug Castro | 1.286 | 2039 | |
| 25 | Ian Barnes | 1.286 | 2038 | |
| 27 | Orlando Días | 1.299 | 2019 | |
| 28 | Danny Dove | 1.303 | 2039 | |
| 29 | Pete Tolbert | 1.312 | 2034 | |
| 30 | Armando Ramos# | 1.322 | 2058 | |
| 31 | Chris Dodrill | 1.331 | 2034 | |
| 32 | Carlton Shafer | 1.337 | 2023 | |
| 33 | Charlie McDermott | 1.342 | 2041 | |
| 34 | Alberto García | 1.343 | 2028 | |
| 35 | Tom O'Day | 1.344 | 2014 | |
| 36 | Chris Hastings | 1.356 | 2020 | |
| 37 | Ed Armstrong | 1.357 | 2019 | |
| 37 | Ramón Castaneda | 1.357 | 2012 | |
| 39 | Ed Armstrong | 1.362 | 2016 | |
| 40 | Justin Jenks# | 1.367 | 2058 | |
| 41 | Clive Jemadari | 1.370 | 2039 | |
| 42 | Dave Hamm | 1.381 | 2028 | |
| 43 | Tomás Bravo* | 1.394 | 2020 | |
| 44 | John Slater | 1.414 | 2017 | |
| 45 | Michael Burton | 1.421 | 2015 | |
| 45 | Carlos Ruíz | 1.421 | 2014 | |
| 45 | Jeremy Anis | 1.421 | 2037 | |
| 48 | John Holmes | 1.428 | 2022 | |
| 49 | Garry Strode | 1.435 | 2025 | |
| 50 | Garry Strode | 1.446 | 2024 | |
| 50 | Erik Fletcher | 1.446 | 2033 | |
| 52 | Eliot Moreau | 1.463 | 2019 | |
| 53 | Vincenzo Rizzoli | 1.467 | 2028 | |
| 54 | Eric Thornton# | 1.469 | 2058 | |
| 55 | Vicente Valenzuela | 1.473 | 2024 | |
| 56 | Elias Bowen | 1.478 | 2023 | |
| 57 | John Grubb | 1.485 | 2012 | |
| 58 | Cameron Mutton# | 1.490 | 2056 | |
| 59 | Mark Hartje# | 1.500 | 2059 | |
| 59 | Paul Johnston | 1.500 | 2022 | |
| 61 | José Delgado | 1.508 | 2013 | |
| 61 | Steve Garrett | 1.508 | 2013 | |
| 63 | Kyle Jackson | 1.521 | 2041 | |
| 64 | Carlton Shafer | 1.528 | 2024 | |
| 65 | Bruce Lowe | 1.533 | 2016 | |
| 66 | George Bedford | 1.536 | 2019 | |
| 67 | Dylan Wilson | 1.552 | 2025 | |
| 68 | Steve Ferguson | 1.561 | 2025 | |
| 69 | Kyle Jackson | 1.565 | 2040 | |
| 70 | António Navarro | 1.574 | 2016 | |
| 71 | Elias Bowen | 1.579 | 2024 | |
| 72 | Jaden Barlow | 1.588 | 2037 | |
| 73 | António Medrano | 1.612 | 2021 | |
| 74 | Jason Klein | 1.620 | 2034 | |
| 75 | Raúl Flores | 1.627 | 2023 | |
| 76 | Bill Pauley | 1.642 | 2047 | |
| 77 | James Phillips | 1.646 | 2013 | |
| 78 | Nate Chapman | 1.650 | 2023 | |
| 79 | Manuel Crespo | 1.653 | 2020 | |
| 79 | Eduardo Marino | 1.653 | 2023 | |
| 81 | Reggie Casteel | 1.677 | 2030 | |
| 82 | Ray Thompson | 1.688 | 2013 | |
| 82 | Dan Edwards | 1.688 | 2023 | |
| 84 | Rob Young | 1.695 | 2014 | |
| 85 | Adam Sullivan | 1.699 | 2032 | |
| 85 | Chris Benn# | 1.699 | 2054 | |
| 87 | Mike Steveson | 1.711 | 2030 | |
| 87 | Chris DeMott# | 1.711 | 2047 | |
| 89 | Juan Mendoza | 1.712 | 2018 | |
| 89 | Bill Baker | 1.712 | 2013 | |
| 91 | Rubén Cabrera | 1.721 | 2023 | |
| 92 | Alberto García | 1.727 | 2026 | |
| 93 | Nate Miller | 1.736 | 2033 | |
| 94 | Dylan Wilson | 1.737 | 2022 | |
| 94 | Manuel García | 1.737 | 2018 | |
| 96 | Roger Rogers | 1.738 | 2026 | |
| 97 | Daryl Feaviour | 1.747 | 2019 | |
| 98 | Zach Phillips# | 1.761 | 2051 | |
| 99 | Robert Osborne | 1.778 | 2013 | |
| 99 | Jack Beard | 1.778 | 2013 |
