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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Louis McDowell | 4.02 | 2015-2030 | |
| 2 | Woo-suk Cho | 4.41 | 2026-2032 | |
| 3 | Júlio Vázquez | 4.54 | 2027-2032 | |
| 4 | David Davis | 4.65 | 2019-2030 | |
| 5 | Mike Barrett | 5.04 | 2022-2027 |
