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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Luis Castrejón# | 3.47 | 2024-2029 | |
| 2 | Phil Miller# | 3.48 | 2026-2028 | |
| 3 | Mike Foltynewicz# | 3.77 | 2026-2028 | |
| 4 | Pat Hunt# | 3.78 | 2017-2029 | |
| 5 | Juan Pérez | 3.84 | 2017-2023 | |
| 6 | César González# | 3.97 | 2020-2029 | |
| 7 | Shawn Arnold# | 3.99 | 2017-2020 | |
| 8 | Kyle McPherson | 4.10 | 2018-2023 | |
| 9 | Lance de Valk# | 4.26 | 2025-2029 | |
| 10 | Carlos Hernández# | 4.39 | 2021-2028 | |
| 11 | Lester Sullivan# | 4.47 | 2018-2020 | |
| 12 | Jeff Cox | 4.54 | 2018-2021 | |
| 13 | Ben Logan# | 4.74 | 2019-2023 | |
| 14 | Paco Hernández# | 4.94 | 2021-2027 | |
| 15 | Arnie Banks# | 5.21 | 2024-2028 | |
| 16 | Steve Sanders | 6.17 | 2015-2019 |
