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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Mario Ruíz# | 3.55 | 2023-2030 | |
| 2 | Travis Carson# | 3.72 | 2022-2024 | |
| 3 | Victor Brey# | 3.81 | 2021-2028 | |
| 4 | Lucas Begay# | 3.85 | 2025-2028 | |
| 5 | Rocky Lannan# | 3.86 | 2026-2030 | |
| 6 | Dennis Brown# | 3.95 | 2022-2030 | |
| 7 | Chae-seong Kim# | 4.16 | 2023-2030 | |
| 8 | Artie Horton | 4.27 | 2022-2025 | |
| 9 | Marvin Mangin# | 4.30 | 2023-2028 | |
| 10 | Claudio Díaz# | 4.36 | 2022-2030 | |
| 11 | Jeff Schneider# | 4.52 | 2022-2028 | |
| 12 | Pedro Pacheco# | 4.61 | 2020-2030 | |
| 13 | Henri Pollini# | 4.62 | 2019-2030 | |
| 14 | José Salinas | 4.73 | 2017-2027 | |
| 15 | Louis McDowell# | 4.76 | 2016-2028 | |
| 16 | King Fletcher# | 4.91 | 2023-2030 | |
| 17 | Willie Cameron# | 5.24 | 2016-2030 | |
| 18 | Norm Burris | 5.60 | 2016-2021 | |
| 19 | José Acevedo | 5.68 | 2013-2023 | |
| 20 | Doug Ryan | 5.80 | 2016-2024 | |
| 21 | Reynaldo Sánchez# | 5.85 | 2024-2030 | |
| 22 | Earl Brown# | 5.94 | 2023-2030 | |
| 23 | Marcos Mesa | 6.01 | 2023-2030 | |
| 24 | Morris Nicholson | 6.16 | 2013-2021 | |
| 25 | Aurélien Godet | 6.25 | 2015-2023 | |
| 26 | Greg Beaver | 6.63 | 2016-2019 |
