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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Ludwik Stoffels | 1.558 | 2049-2055 | |
| 2 | Jason Paul# | 1.890 | 2065-2067 | |
| 3 | Ray Cunningham | 2.168 | 2052-2053 | |
| 4 | Ludovico Aiveca# | 2.430 | 2063-2063 | |
| 5 | Bohdan Grady | 2.455 | 2022-2024 | |
| 6 | Boyd Carlton | 2.700 | 2052-2056 | |
| 7 | Régis Boulay# | 2.776 | 2060-2062 | |
| 8 | Luke Bolka | 2.808 | 2017-2021 | |
| 9 | Kyle Klein# | 2.812 | 2057-2059 | |
| 10 | Mike Range | 2.872 | 2032-2034 | |
| 11 | Melvin Caine | 2.893 | 2022-2030 | |
| 12 | Pavlusha Gorojaninov | 3.106 | 2057-2059 | |
| 12 | Richard Howell | 3.106 | 2048-2056 | |
| 14 | Bill Hortley | 3.150 | 2023-2029 | |
| 15 | Richard Veeck | 3.206 | 2052-2055 | |
| 16 | Alfredo León# | 3.250 | 2063-2066 | |
| 17 | Carlos Leonard | 3.287 | 2015-2016 | |
| 18 | Artie McPha | 3.682 | 2058-2060 | |
| 19 | Hugues Briand | 3.774 | 2034-2036 | |
| 20 | David Ramos | 3.900 | 2046-2049 | |
| 21 | Bastien Dupont# | 3.932 | 2063-2064 | |
| 22 | Cody Kukuk | 4.071 | 2013-2022 | |
| 23 | Arnold Stoffler | 4.091 | 2044-2051 | |
| 24 | Da'ud bin Sa'eed# | 4.263 | 2063-2065 | |
| 25 | Angel Lezama | 4.402 | 2016-2022 | |
| 26 | Manuel Ruíz | 4.423 | 2052-2057 | |
| 27 | Manuel Villa# | 4.465 | 2056-2059 | |
| 28 | Jeronym Rohm# | 4.590 | 2065-2067 | |
| 29 | Onne Ehles# | 4.636 | 2063-2064 | |
| 30 | Adrian Rivero | 4.756 | 2017-2021 | |
| 31 | Edvin Stenberger# | 5.044 | 2064-2065 | |
| 32 | Flint Thomas# | 5.049 | 2064-2066 | |
| 33 | Alfonso García | 5.116 | 2059-2062 | |
| 34 | Jeremy Stokes# | 5.162 | 2063-2066 | |
| 35 | Mike Thomas | 5.289 | 2015-2016 | |
| 36 | Paulin Nuvolari# | 5.400 | 2063-2065 | |
| 36 | John Mayfield | 5.400 | 2052-2056 | |
| 38 | Jorge Daniel | 5.750 | 2060-2062 | |
| 39 | Alberto Hernández | 5.971 | 2022-2024 | |
| 40 | Alfredo Rosário# | 6.253 | 2063-2065 | |
| 41 | Seung Kim# | 6.429 | 2063-2065 |
