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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Norm Porter# | 0.982 | 2031 | |
| 2 | Thurman Brewster# | 1.473 | 2031 | |
| 3 | Raúl Chávez# | 2.204 | 2031 | |
| 4 | Chad Pierson# | 2.227 | 2031 | |
| 5 | Javier Cortés# | 2.333 | 2031 | |
| 6 | Seung-mo Park# | 2.585 | 2031 | |
| 7 | José González# | 2.613 | 2031 | |
| 8 | Juan Guillén# | 3.259 | 2031 | |
| 9 | Danny Munro# | 3.695 | 2031 | |
| 10 | Tony Welch# | 3.938 | 2031 | |
| 11 | Robert Hahn# | 6.288 | 2031 | |
| 12 | Flip Knoops# | 7.468 | 2031 |
