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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Walt McCarthy# | 0.557 | 2037-2039 | |
| 2 | Tyler Hanna# | 1.909 | 2040-2042 | |
| 3 | Tim Howitt# | 4.402 | 2041-2044 | |
| 4 | Wilbur Fullerton# | 5.218 | 2045-2049 | |
| 5 | Ralph Turner# | 8.156 | 2045-2049 |
