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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Ken Berg | 0.000 | 1980 | |
| 1 | Mike Manion | 0.000 | 1999 | |
| 1 | Juan Arteaga | 0.000 | 1998 | |
| 1 | Alain Favreau | 0.000 | 1999 | |
| 5 | Lyle Almaguer# | 0.397 | 2040 | |
| 6 | Christopher James# | 0.435 | 2042 | |
| 7 | Sergio Ramos | 0.443 | 1993 | |
| 8 | Juan Salgado | 0.474 | 2003 | |
| 9 | George Villines | 0.519 | 2043 | |
| 10 | Alfredo Garza* | 0.540 | 1997 | |
| 10 | Jeff Frost# | 0.540 | 2042 | |
| 12 | Jake Suess | 0.545 | 2002 | |
| 13 | Doug Goetz | 0.562 | 2005 | |
| 13 | Joe Collins | 0.562 | 1986 | |
| 13 | Pat Judd# | 0.562 | 2044 | |
| 16 | Noah Thompson# | 0.587 | 2041 | |
| 17 | Nate Medley | 0.743 | 1991 | |
| 18 | D.J. Boyer | 0.750 | 1980 | |
| 19 | Joe Allen | 0.761 | 1982 | |
| 20 | Bobby Giraldo* | 0.786 | 2023 | |
| 21 | Jon Stahl | 0.844 | 1991 | |
| 21 | A.J. Cutway# | 0.844 | 2049 | |
| 23 | Errol Medrano# | 0.900 | 2050 | |
| 23 | Daniel Abreu# | 0.900 | 2047 | |
| 23 | Ernesto Pons* | 0.900 | 2011 | |
| 26 | Jaheim Greenidge | 0.915 | 2007 | |
| 26 | Robby Wodarczyk | 0.915 | 2006 | |
| 28 | Jeremy Mellen | 0.931 | 2027 | |
| 29 | Cooper Jensen# | 0.942 | 2047 | |
| 30 | Ernesto Pons* | 0.956 | 2013 | |
| 31 | Danny Bradley | 0.964 | 2025 | |
| 31 | Micah DeGrasse | 0.964 | 2043 | |
| 33 | Jaheim Wootson | 0.982 | 2007 | |
| 33 | Joe Collins | 0.982 | 1982 | |
| 35 | Kason Faucher# | 0.988 | 2046 | |
| 36 | Ean Holby# | 1.012 | 2050 | |
| 37 | Mike Waters | 1.019 | 1989 | |
| 37 | Sam Bone | 1.019 | 2005 | |
| 39 | Woodrow Regel | 1.038 | 2043 | |
| 40 | T.J. Rusk# | 1.059 | 2049 | |
| 41 | Davin Hess | 1.069 | 1999 | |
| 42 | Jason Hartman# | 1.080 | 2049 | |
| 42 | Brandon Pellegrino | 1.080 | 2040 | |
| 42 | Pat Ward | 1.080 | 1985 | |
| 45 | Bobby Giraldo* | 1.089 | 2022 | |
| 46 | Josh Pahl | 1.125 | 2003 | |
| 46 | Woodrow Regel | 1.125 | 2033 | |
| 46 | Ethan Wilson | 1.125 | 2037 | |
| 46 | Bobby Giraldo* | 1.125 | 2024 | |
| 50 | Jason Blakley | 1.149 | 2042 | |
| 50 | Ryan Greene* | 1.149 | 2022 | |
| 52 | Rich Willis* | 1.157 | 2030 | |
| 52 | George Sullivan | 1.157 | 2038 | |
| 54 | Ed Garner | 1.174 | 2002 | |
| 54 | Kevin Bihl | 1.174 | 2015 | |
| 54 | Adam O'Brien | 1.174 | 2020 | |
| 54 | Mike Manion | 1.174 | 1996 | |
| 54 | Eric Wilson# | 1.174 | 2042 | |
| 59 | Willie Dillard | 1.200 | 1995 | |
| 59 | Jeremy Lawton# | 1.200 | 2047 | |
| 59 | Leo Angeles | 1.200 | 2026 | |
| 59 | Rich Willis* | 1.200 | 2032 | |
| 59 | Dustin Edwards | 1.200 | 2033 | |
| 59 | Jonathan Prenger | 1.200 | 1993 | |
| 59 | Alard Floyd | 1.200 | 2035 | |
| 66 | Ernesto Pons* | 1.213 | 2002 | |
| 67 | Jake Tackett | 1.246 | 2003 | |
| 67 | Joe Lau | 1.246 | 1980 | |
| 67 | Robert Stevenson# | 1.246 | 2049 | |
| 70 | Oliver Snider* | 1.266 | 2043 | |
| 71 | Oliver Snider* | 1.286 | 2035 | |
| 71 | John Trammell | 1.286 | 2031 | |
| 71 | Hugo Paulino# | 1.286 | 2046 | |
| 71 | Juan Ramos* | 1.286 | 2002 | |
| 71 | Miguel Arranaga# | 1.286 | 2047 | |
| 76 | Ralph Vincent# | 1.298 | 2043 | |
| 77 | Chris Mercado* | 1.333 | 2026 | |
| 77 | Travis Arford* | 1.333 | 2024 | |
| 79 | Ernesto Villasenor | 1.350 | 1994 | |
| 80 | Bobby Aguilar* | 1.364 | 2037 | |
| 81 | Whitney Gee | 1.373 | 1984 | |
| 81 | Angelo Torres* | 1.373 | 2029 | |
| 81 | Chris Scarborough | 1.373 | 1994 | |
| 84 | Ramon Ocampo | 1.397 | 2036 | |
| 85 | Nat Southerland# | 1.403 | 2046 | |
| 86 | Jesse Hyde | 1.421 | 2024 | |
| 86 | Khalil Savage* | 1.421 | 2009 | |
| 88 | Willie Moreno | 1.440 | 1983 | |
| 89 | Austin Defenbaugh# | 1.446 | 2047 | |
| 89 | Joe Haggerty | 1.446 | 2034 | |
| 91 | Mike Hill | 1.452 | 1989 | |
| 92 | Meiji Ito | 1.459 | 2003 | |
| 93 | Mike Campos | 1.467 | 1984 | |
| 94 | Roland Markgraf# | 1.473 | 2046 | |
| 94 | Juan Rosas | 1.473 | 1997 | |
| 94 | Jesus Arvelo | 1.473 | 2024 | |
| 97 | Bobby Aguilar* | 1.479 | 2045 | |
| 98 | Lyle Almaguer# | 1.484 | 2043 | |
| 99 | Joel Lawton | 1.500 | 1993 | |
| 99 | Arturo Alvarado* | 1.500 | 2007 |
