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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Duane Deal# | 1.200 | 2030 | |
| 2 | Ángel Rodríguez | 1.446 | 2031 | |
| 3 | Matt Hoffman | 1.688 | 2028 | |
| 3 | Danny Clayton# | 1.688 | 2030 | |
| 5 | Dave Wheeler# | 2.935 | 2038 | |
| 6 | Jim Snyder# | 3.150 | 2033 | |
| 7 | Lou Ferrell# | 3.436 | 2036 | |
| 8 | Henry Owens# | 4.109 | 2033 | |
| 9 | Mike Marks | 4.673 | 2032 | |
| 10 | Jesús Rivera# | 4.800 | 2035 |
