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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Randy Hamilton | 2.08 | 2015-2015 | |
| 2 | Felipe Moreno | 2.76 | 2021-2028 | |
| 3 | Ramón Gómez# | 3.24 | 2023-2032 | |
| 4 | David White | 3.27 | 2015-2023 | |
| 5 | Max Grant# | 3.32 | 2019-2021 | |
| 6 | Frank Cronshaw# | 3.34 | 2020-2027 | |
| 7 | Seong-rae An# | 3.58 | 2026-2032 | |
| 8 | Douglas Pantall# | 3.92 | 2028-2032 | |
| 9 | David Bryan | 4.45 | 2012-2025 | |
| 10 | Sam Hatt | 4.50 | 2021-2022 | |
| 11 | Mehmood Dar# | 4.54 | 2020-2021 | |
| 12 | Jason Atkinson | 4.67 | 2023-2026 | |
| 13 | José Contreras | 4.70 | 2014-2020 | |
| 14 | Tom Collins | 4.72 | 2017-2026 | |
| 15 | Jayakar Ramadin | 6.11 | 2020-2028 | |
| 16 | George Clay | 7.06 | 2016-2024 |
