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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Perry Harris | 1.091 | 2029-2032 | |
| 2 | Mike Pullman# | 1.800 | 2042-2047 | |
| 3 | Rob Stanley# | 1.969 | 2041-2042 | |
| 4 | William Dorey# | 2.077 | 2041-2044 | |
| 5 | Carlos López# | 3.000 | 2043-2044 | |
| 6 | Mike Barker# | 3.160 | 2041-2043 | |
| 7 | José Chapa# | 3.240 | 2041-2042 | |
| 8 | Vincent Baird# | 3.682 | 2041-2046 | |
| 9 | John Keil# | 3.706 | 2044-2045 | |
| 10 | Daniel Barnes# | 4.451 | 2042-2043 | |
| 11 | Anatolio Lucci# | 4.538 | 2041-2045 |
