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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Mario Ruíz# | 3.58 | 2023-2031 | |
| 2 | Travis Carson# | 3.69 | 2022-2032 | |
| 3 | Victor Brey# | 3.81 | 2021-2028 | |
| 4 | Lucas Begay# | 3.85 | 2025-2028 | |
| 5 | Dennis Brown | 3.95 | 2022-2030 | |
| 6 | Gary Barber# | 4.15 | 2021-2032 | |
| 7 | Chae-seong Kim# | 4.16 | 2023-2032 | |
| 8 | Claudio Díaz# | 4.27 | 2022-2031 | |
| 9 | Marvin Mangin | 4.30 | 2023-2028 | |
| 10 | Drake Riley# | 4.34 | 2023-2032 | |
| 11 | Jeff Schneider# | 4.52 | 2022-2028 | |
| 12 | Eduardo Capata# | 4.53 | 2019-2032 | |
| 13 | Pedro Pacheco# | 4.54 | 2020-2032 | |
| 14 | Henri Pollini# | 4.62 | 2019-2030 | |
| 15 | Miguel Álvarez# | 4.66 | 2027-2032 | |
| 16 | José Salinas | 4.73 | 2017-2027 | |
| 17 | King Fletcher# | 4.91 | 2023-2030 | |
| 18 | Willie Cameron | 5.35 | 2016-2031 | |
| 19 | Norm Burris | 5.60 | 2016-2021 | |
| 20 | José Acevedo | 5.68 | 2013-2023 | |
| 21 | Reynaldo Sánchez# | 5.78 | 2024-2032 | |
| 22 | Earl Brown# | 6.00 | 2023-2031 | |
| 23 | Marcos Mesa | 6.01 | 2023-2030 |
