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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Joe Wamboldt# | 0.563 | 2027 | |
| 2 | Austin Covey | 1.080 | 2026 | |
| 3 | Rick Hill# | 1.731 | 2019 | |
| 4 | Ju-ao Ru# | 1.776 | 2027 | |
| 5 | Dave Conboy# | 2.118 | 2025 | |
| 6 | Luis Miguel Toledo | 2.143 | 2018 | |
| 7 | Quincy Moss | 2.160 | 2025 | |
| 8 | Jacob Willard# | 2.227 | 2021 | |
| 9 | Nelson Stott# | 2.282 | 2027 | |
| 10 | Haden Nunn | 2.298 | 2026 | |
| 11 | Carl Beck | 2.368 | 2020 | |
| 12 | Paco Ortega | 2.392 | 2022 | |
| 13 | Hugh Bowness | 2.455 | 2023 | |
| 14 | Gabin Dubourg | 2.647 | 2026 | |
| 15 | Pedro Salas | 2.793 | 2022 | |
| 16 | Hideyori Ohayashi# | 3.000 | 2019 | |
| 16 | Hervé Muller# | 3.000 | 2023 | |
| 18 | Dallas Savage | 3.076 | 2018 | |
| 19 | Tomás Quiñonez | 3.259 | 2021 | |
| 20 | Ross Batstone# | 3.375 | 2027 | |
| 21 | Adrien Clément# | 3.494 | 2012 | |
| 22 | Brian Lapointe# | 3.500 | 2023 | |
| 23 | Tim St.george# | 3.724 | 2028 | |
| 24 | Francisco Rolón | 3.780 | 2021 | |
| 25 | Logan Coady# | 3.960 | 2027 | |
| 26 | Bryan Roland | 4.021 | 2025 | |
| 27 | Claude Fraysse | 4.050 | 2024 | |
| 28 | Enrique López | 4.075 | 2019 | |
| 29 | Duane Lummis# | 4.119 | 2026 | |
| 30 | Alain Jeannin# | 4.190 | 2028 | |
| 31 | Matis Barrier# | 4.355 | 2025 | |
| 32 | Clement Bowden# | 4.500 | 2029 | |
| 32 | Rick MacLellan# | 4.500 | 2023 | |
| 34 | Henry McGaughey | 4.563 | 2024 | |
| 35 | Randy Owry# | 4.596 | 2025 | |
| 36 | Alain Laporte | 4.618 | 2017 | |
| 37 | Tim Stady# | 4.860 | 2027 | |
| 38 | Javier Ortíz | 4.959 | 2022 | |
| 39 | Artie Harris | 5.040 | 2020 | |
| 40 | Chris Stone | 5.143 | 2018 | |
| 41 | Iván Vázquez# | 5.170 | 2022 | |
| 42 | Jason Walker# | 5.192 | 2021 | |
| 43 | Greg Day# | 5.294 | 2029 | |
| 44 | Bill Hoffmann# | 5.304 | 2028 | |
| 44 | Bruce Easton# | 5.304 | 2028 | |
| 46 | James Thompson# | 5.484 | 2021 | |
| 47 | Armando Hernández | 5.510 | 2019 | |
| 48 | Arnaud Durand | 5.559 | 2023 | |
| 49 | Tim Conway | 5.642 | 2020 | |
| 50 | Vic Brooks# | 5.870 | 2029 | |
| 51 | Walker Hoekstra# | 6.000 | 2029 | |
| 52 | Yannis Legrand | 6.188 | 2015 | |
| 53 | Scott Weatherby | 7.800 | 2016 | |
| 54 | Joël Meyer# | 8.660 | 2028 | |
| 55 | Joshua Goldberg | 8.836 | 2012 | |
| 56 | Elliott Rogers# | 9.679 | 2021 |
