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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Hirose Inouye# | 0.000 | 1958 | |
| 2 | Eitan Löbel# | 0.806 | 1958 | |
| 3 | Ewan Moore# | 1.528 | 1956 | |
| 4 | Jessy Kok# | 1.558 | 1958 | |
| 5 | Griff Murphy# | 1.688 | 1955 | |
| 6 | Theodor Brown# | 2.118 | 1954 | |
| 7 | Ewan Moore# | 2.282 | 1957 | |
| 8 | Seon-jong Kim# | 2.298 | 1956 | |
| 9 | Ewan Moore# | 2.368 | 1952 | |
| 10 | Hirose Inouye# | 2.520 | 1957 | |
| 11 | Khalil Smith# | 2.872 | 1954 | |
| 12 | Ewan Moore# | 2.935 | 1958 | |
| 13 | Renaud Goffi# | 3.000 | 1958 | |
| 13 | Mounir Soulier# | 3.000 | 1956 | |
| 15 | Ewan Moore# | 3.228 | 1955 | |
| 16 | Mounir Soulier# | 3.375 | 1953 | |
| 17 | Chris Walker# | 3.506 | 1954 | |
| 18 | Alexandre Lefevre# | 3.522 | 1956 | |
| 19 | Aaron Maier# | 3.706 | 1952 | |
| 20 | Mounir Soulier# | 3.780 | 1952 | |
| 21 | Omar Cespedes# | 3.971 | 1953 | |
| 22 | Juan Flores# | 4.030 | 1957 | |
| 23 | Danny Arellano# | 4.091 | 1953 | |
| 24 | Aaron Maier# | 4.154 | 1953 | |
| 25 | Ken Roberts# | 4.426 | 1955 | |
| 26 | Adam Scali# | 4.585 | 1954 | |
| 27 | John Hahn# | 5.586 | 1955 | |
| 28 | Jim Meagher# | 6.288 | 1955 | |
| 29 | Chris Walker# | 6.457 | 1955 | |
| 30 | Chris Alexander# | 6.532 | 1957 |
