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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Mario Ruíz# | 3.50 | 2023-2027 | |
| 2 | Travis Carson# | 3.72 | 2022-2024 | |
| 3 | Cris Herrera# | 3.74 | 2022-2027 | |
| 4 | Dennis Brown# | 3.75 | 2022-2026 | |
| 5 | Victor Brey# | 3.81 | 2021-2028 | |
| 6 | Lucas Begay# | 3.85 | 2025-2028 | |
| 7 | Chae-seong Kim# | 4.17 | 2023-2029 | |
| 8 | Artie Horton | 4.27 | 2022-2025 | |
| 9 | Claudio Díaz# | 4.29 | 2022-2029 | |
| 10 | Marvin Mangin# | 4.30 | 2023-2028 | |
| 11 | Jeff Schneider# | 4.52 | 2022-2028 | |
| 12 | Henri Pollini# | 4.67 | 2019-2029 | |
| 13 | José Salinas# | 4.73 | 2017-2027 | |
| 14 | Louis McDowell# | 4.76 | 2016-2028 | |
| 15 | King Fletcher# | 4.93 | 2023-2029 | |
| 16 | Eduardo Capata# | 4.99 | 2019-2021 | |
| 17 | Willie Cameron# | 5.31 | 2016-2028 | |
| 18 | Norm Burris | 5.60 | 2016-2021 | |
| 19 | José Acevedo | 5.68 | 2013-2023 | |
| 20 | Reynaldo Sánchez# | 5.79 | 2024-2029 | |
| 21 | Doug Ryan | 5.80 | 2016-2024 | |
| 22 | Dave Conley | 5.93 | 2015-2018 | |
| 23 | Marcos Mesa# | 6.01 | 2023-2029 | |
| 24 | Earl Brown# | 6.07 | 2023-2029 | |
| 25 | Morris Nicholson | 6.16 | 2013-2021 | |
| 26 | Aurélien Godet | 6.25 | 2015-2023 | |
| 27 | Greg Beaver | 6.63 | 2016-2019 |
