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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Todd Hines# | 1.389 | 2023 | |
| 2 | Shigemasa Horiuchi# | 1.554 | 2020 | |
| 3 | Randy Hoffman | 1.562 | 2021 | |
| 4 | Todd Hines# | 1.708 | 2024 | |
| 5 | Tom Reynolds# | 1.751 | 2016 | |
| 6 | Ramón Ortega | 1.787 | 2022 | |
| 7 | Pedro Ritodíaz | 1.808 | 2017 | |
| 8 | Harrison Jones | 1.836 | 2017 | |
| 8 | Kyle Lewis | 1.836 | 2015 | |
| 10 | William Johnson | 1.916 | 2016 | |
| 11 | Tim Powell | 1.932 | 2017 | |
| 12 | Keisuke Nishida# | 1.941 | 2027 | |
| 13 | Tom Reynolds# | 1.957 | 2018 | |
| 14 | Sexto Rodríguez | 1.990 | 2016 | |
| 15 | Roberto Calderón# | 2.018 | 2029 | |
| 16 | Shigemasa Horiuchi# | 2.022 | 2019 | |
| 17 | Walt Coffman# | 2.039 | 2028 | |
| 18 | José Reyna# | 2.063 | 2022 | |
| 19 | Peter Rivers | 2.065 | 2020 | |
| 20 | Luis Peña# | 2.073 | 2026 | |
| 21 | Gary Bailey# | 2.106 | 2029 | |
| 22 | Adrián Fierro# | 2.108 | 2020 | |
| 23 | Lorenzo Sánchez# | 2.146 | 2020 | |
| 24 | Dave Goode | 2.150 | 2019 | |
| 25 | Pedro Ritodíaz | 2.155 | 2015 | |
| 26 | Pedro Ritodíaz | 2.168 | 2016 | |
| 27 | Shigemasa Horiuchi# | 2.177 | 2028 | |
| 28 | Pedro Alejándrez# | 2.204 | 2020 | |
| 29 | Gary Bailey# | 2.209 | 2018 | |
| 30 | Jason Hubbell# | 2.222 | 2021 | |
| 31 | Shigemasa Horiuchi# | 2.224 | 2018 | |
| 32 | Rafael Cardona# | 2.226 | 2025 | |
| 33 | Ricardo Hernández | 2.235 | 2016 | |
| 34 | Eddie Kop# | 2.255 | 2027 | |
| 35 | Chip Bishop# | 2.279 | 2015 | |
| 36 | Peter Rivers | 2.289 | 2019 | |
| 37 | Ralph Jones | 2.291 | 2015 | |
| 38 | Shigemasa Horiuchi# | 2.309 | 2021 | |
| 39 | George Frazier# | 2.326 | 2026 | |
| 40 | Carlos Sánchez# | 2.341 | 2023 | |
| 40 | Gary Bailey# | 2.341 | 2020 | |
| 42 | Matt Webber# | 2.345 | 2022 | |
| 43 | Pat Farrell | 2.359 | 2015 | |
| 44 | Tim Powell | 2.368 | 2018 | |
| 45 | Alexis Zambaco# | 2.390 | 2028 | |
| 46 | Florim Zhulati | 2.392 | 2015 | |
| 47 | Chip Bishop# | 2.400 | 2025 | |
| 48 | John Holley | 2.401 | 2016 | |
| 49 | Dave Goode | 2.424 | 2021 | |
| 50 | Addie Samson# | 2.443 | 2027 | |
| 51 | Gary Bailey# | 2.455 | 2019 | |
| 51 | Pat Farrell | 2.455 | 2016 | |
| 53 | Rafael Cardona# | 2.460 | 2022 | |
| 54 | Zach Rediker# | 2.466 | 2029 | |
| 55 | Rusty Swanson# | 2.468 | 2028 | |
| 56 | Lorenzo Sánchez# | 2.480 | 2021 | |
| 57 | Jared Cox | 2.485 | 2016 | |
| 58 | José Alaniz# | 2.488 | 2021 | |
| 59 | Henry Hall# | 2.492 | 2023 | |
| 60 | Alfonso Zapata# | 2.496 | 2025 | |
| 61 | Walt Coffman# | 2.504 | 2029 | |
| 62 | Tim Powell | 2.516 | 2016 | |
| 63 | Pedro Alejándrez# | 2.519 | 2021 | |
| 64 | Addie Samson# | 2.549 | 2026 | |
| 65 | Kent Clement# | 2.555 | 2028 | |
| 66 | John Alvarado | 2.557 | 2020 | |
| 67 | Gary Bailey# | 2.559 | 2021 | |
| 68 | Benny York# | 2.571 | 2017 | |
| 69 | Michael Machen# | 2.574 | 2029 | |
| 70 | Edison Larson# | 2.575 | 2028 | |
| 71 | Carlos Sánchez# | 2.579 | 2022 | |
| 72 | Manuel Rojas# | 2.586 | 2016 | |
| 73 | Tetsuzan Kaneko | 2.587 | 2022 | |
| 74 | Bill Prowse | 2.594 | 2016 | |
| 75 | Greg White# | 2.597 | 2022 | |
| 76 | Eric Matson# | 2.604 | 2027 | |
| 77 | Tetsuzan Kaneko | 2.605 | 2023 | |
| 78 | Chip Bishop# | 2.615 | 2016 | |
| 79 | Gary Bailey# | 2.616 | 2028 | |
| 80 | Luis Peña# | 2.617 | 2028 | |
| 80 | Cole Hall | 2.617 | 2016 | |
| 82 | Shigemasa Horiuchi# | 2.621 | 2022 | |
| 83 | Richard Sykes | 2.624 | 2026 | |
| 84 | John Wilkins# | 2.634 | 2024 | |
| 85 | Ron Manning# | 2.642 | 2029 | |
| 86 | Jeff Territt# | 2.644 | 2021 | |
| 87 | Fraser Cuevas# | 2.649 | 2021 | |
| 88 | Bill Prowse | 2.654 | 2020 | |
| 89 | Sexto Rodríguez | 2.675 | 2018 | |
| 90 | Russ Horne# | 2.683 | 2027 | |
| 91 | António Hernández# | 2.686 | 2027 | |
| 92 | Seung-hyeon So# | 2.700 | 2026 | |
| 93 | Harrison Jones | 2.706 | 2018 | |
| 94 | José Rico# | 2.708 | 2025 | |
| 95 | Roderick Rhodes# | 2.713 | 2017 | |
| 96 | Jesús Medina# | 2.723 | 2028 | |
| 97 | Walt Johnston | 2.732 | 2016 | |
| 98 | Carlos Sánchez# | 2.734 | 2024 | |
| 99 | Seung-hyeon So# | 2.757 | 2025 | |
| 100 | Cris Herrera# | 2.765 | 2025 |
