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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Roland Jamison# | 3.372 | 2053-2062 | |
| 2 | Korbin Dallas | 3.590 | 2046-2053 | |
| 3 | Alin Oanta | 3.613 | 2020-2027 | |
| 4 | Thomas Canó | 3.822 | 2044-2055 | |
| 5 | Seong-rae Park | 4.071 | 2026-2035 | |
| 6 | Iban Wilson | 4.104 | 2046-2056 | |
| 7 | Billy Hansen | 4.177 | 2048-2053 | |
| 8 | Will Hoffman | 4.758 | 2029-2042 | |
| 9 | Bob Browning | 5.202 | 2027-2038 | |
| 10 | Pedro López | 5.659 | 2037-2045 |
