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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Randy Hamilton | 2.077 | 2015-2015 | |
| 2 | Dave McCrudden | 2.314 | 2036-2037 | |
| 3 | Alfredo Tirado# | 2.755 | 2050-2053 | |
| 4 | Kyle Taylor# | 2.784 | 2054-2057 | |
| 5 | Grant Huffman | 2.899 | 2032-2035 | |
| 6 | Ramón Gómez | 3.240 | 2023-2032 | |
| 7 | David White | 3.266 | 2015-2023 | |
| 8 | Max Grant | 3.318 | 2019-2034 | |
| 9 | Fei-hsien Xun | 3.375 | 2043-2046 | |
| 10 | Josh Geary# | 3.500 | 2056-2058 | |
| 11 | Sam Hatt | 4.500 | 2021-2022 | |
| 12 | Mehmood Dar | 4.545 | 2020-2021 | |
| 13 | Tom Collins | 4.717 | 2017-2026 | |
| 14 | Matt Nolan | 5.047 | 2028-2034 | |
| 15 | Héctor González | 5.684 | 2030-2041 | |
| 16 | Blake Gottshall# | 5.769 | 2056-2058 | |
| 17 | Dave Pinkley | 5.914 | 2040-2043 | |
| 18 | Edwin Avila | 6.000 | 2040-2041 | |
| 19 | Jayakar Ramadin | 6.109 | 2020-2028 |
