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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Manuel Medranda | 3.946 | 2034-2039 | |
| 2 | Louis McDowell | 4.021 | 2015-2030 | |
| 3 | Woo-suk Cho | 4.414 | 2026-2032 | |
| 4 | Júlio Vázquez | 4.539 | 2027-2032 | |
| 5 | David Davis | 4.647 | 2019-2030 | |
| 6 | Mike Barrett | 5.039 | 2022-2027 |
