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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | James Scott# | 3.54 | 2022-2029 | |
| 2 | Juan Cruz# | 3.62 | 2021-2029 | |
| 3 | Rodger de Meza# | 3.83 | 2022-2026 | |
| 4 | Jason McKinney | 3.99 | 2015-2024 | |
| 5 | Raúl Pérez | 4.07 | 2015-2025 | |
| 6 | Nate Rogers | 4.16 | 2017-2025 | |
| 7 | Fernando González | 4.31 | 2017-2024 | |
| 8 | Edward Whipp# | 4.37 | 2023-2029 | |
| 9 | Ron Barry | 4.40 | 2015-2019 | |
| 10 | Aaron Wise# | 4.57 | 2017-2023 | |
| 11 | Huai-yu Kan | 4.67 | 2015-2022 | |
| 11 | Grant White | 4.67 | 2022-2028 | |
| 13 | Cole Johnson | 4.83 | 2016-2020 | |
| 14 | Júlio Hernández | 4.99 | 2016-2025 | |
| 15 | Juan Reyes# | 5.11 | 2024-2028 | |
| 16 | Manny Pérez# | 5.16 | 2024-2029 | |
| 17 | Eric Newell# | 5.21 | 2020-2024 | |
| 17 | Joe Holmes | 5.21 | 2016-2020 | |
| 19 | Dave Ponsonby | 5.35 | 2015-2024 | |
| 20 | Santiago Mesa# | 5.63 | 2024-2029 | |
| 21 | Juan Lara# | 5.72 | 2025-2029 | |
| 22 | Gordon Wiggins | 5.91 | 2015-2025 | |
| 23 | Manuel Delgado | 6.32 | 2016-2026 | |
| 24 | Jeff Krause | 7.29 | 2016-2025 |
