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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Reese Noble | 2.812 | 2046-2059 | |
| 2 | Fernando Asencio | 2.848 | 1978-1991 | |
| 3 | Ricky Rangel | 2.879 | 1994-2006 | |
| 4 | Loïc Chouinard | 2.947 | 1994-2004 | |
| 5 | Ernie Fields | 2.982 | 2011-2017 | |
| 6 | Hector Perdomo | 3.007 | 2003-2019 | |
| 7 | Shi-kai Wu | 3.020 | 1994-2001 | |
| 8 | Parker Patrick | 3.072 | 2049-2056 | |
| 9 | Willie Trent | 3.077 | 1994-2001 | |
| 10 | Raphaël Beaupré | 3.093 | 2001-2012 | |
| 11 | Tommy Hunt | 3.103 | 1996-2007 | |
| 12 | Pat Daniels | 3.127 | 1988-1998 | |
| 13 | Chase Cole | 3.129 | 2046-2057 | |
| 14 | Dave Bell# | 3.135 | 2047-2059 | |
| 15 | Junior Rúbio | 3.142 | 1989-2002 | |
| 16 | Pat Kimmick | 3.160 | 2015-2029 | |
| 17 | Erik Scarpelli | 3.168 | 2049-2056 | |
| 18 | Efren Deas | 3.178 | 2050-2059 | |
| 19 | Todd Harper | 3.184 | 2043-2049 | |
| 20 | Fulass Runihura | 3.193 | 1980-1991 | |
| 21 | R.J. Brookman | 3.195 | 2002-2016 | |
| 22 | Donnie Lewis | 3.204 | 1995-2003 | |
| 23 | Chandler Clough# | 3.209 | 2049-2059 | |
| 24 | Noël Botiglieri | 3.211 | 1989-2002 | |
| 25 | Joe Poso | 3.237 | 1978-1986 | |
| 26 | Egon Aranguren# | 3.238 | 2045-2058 | |
| 27 | Antonio Perez | 3.240 | 2013-2025 | |
| 28 | Tom Person | 3.244 | 2009-2018 | |
| 29 | Ian Whitton | 3.266 | 2029-2042 | |
| 30 | Choong-suk Choi | 3.275 | 2015-2026 | |
| 31 | Willis Guardian | 3.278 | 2009-2018 | |
| 32 | Victor Vasquez | 3.283 | 2014-2024 | |
| 33 | Ruben Sostre | 3.285 | 1998-2008 | |
| 34 | Alex Vejar | 3.289 | 2000-2011 | |
| 34 | Eliazar Hernadios | 3.289 | 1979-1988 | |
| 36 | Tom Cassarino | 3.295 | 2043-2056 | |
| 36 | D.J. Johnson | 3.295 | 2025-2040 | |
| 38 | Jonathon Arnholt | 3.302 | 2011-2021 | |
| 39 | Cisco Herrera | 3.307 | 1993-2006 | |
| 40 | Pat Wentzel | 3.313 | 1991-2002 | |
| 41 | J.D. Colovos | 3.318 | 2019-2030 | |
| 42 | Jamal Stroud | 3.329 | 2017-2028 | |
| 43 | Pancho Morreles | 3.333 | 1995-2002 | |
| 44 | Tom Courville | 3.343 | 2028-2040 | |
| 45 | Godofredo Norsaganay | 3.349 | 1978-1986 | |
| 46 | B.J. Smith | 3.357 | 2024-2038 | |
| 47 | Tommy Klingenberg | 3.358 | 2018-2025 | |
| 47 | Edwin Hernandez | 3.358 | 2020-2034 | |
| 49 | Alex Vallejos | 3.360 | 2014-2024 | |
| 50 | Bill Waller | 3.361 | 1979-1987 | |
| 51 | Joey Nunamaker | 3.380 | 2014-2027 | |
| 52 | Reid Hill | 3.381 | 2042-2052 | |
| 53 | Lonnie Bird | 3.383 | 1990-2003 | |
| 54 | Colt Wade | 3.385 | 1992-2000 | |
| 55 | Diego Moore | 3.387 | 2022-2041 | |
| 56 | Travis Skinner | 3.392 | 1998-2012 | |
| 57 | Kyle Perry | 3.394 | 2043-2056 | |
| 58 | Julian Cantrell | 3.397 | 2042-2058 | |
| 59 | Max Richardson# | 3.401 | 2053-2060 | |
| 60 | Tommy Bolinger | 3.403 | 2005-2015 | |
| 60 | Conor Richards | 3.403 | 2043-2057 | |
| 62 | Jimmy Walker | 3.406 | 2024-2039 | |
| 63 | Oscar Mosquea | 3.407 | 2020-2033 | |
| 63 | Randy Butterfield | 3.407 | 2045-2057 | |
| 65 | Manny Perez | 3.414 | 2007-2022 | |
| 66 | Frank Tucker | 3.415 | 1991-2000 | |
| 67 | Jim Bunch | 3.416 | 2028-2038 | |
| 68 | Mauro Maroales | 3.425 | 1978-1986 | |
| 69 | Monty Brugman | 3.431 | 2042-2054 | |
| 70 | Brad Sanford | 3.433 | 1989-1999 | |
| 71 | Fred Dashner | 3.435 | 2006-2017 | |
| 72 | Cy Shelton | 3.444 | 1987-2000 | |
| 73 | Ellery Skaleski# | 3.447 | 2047-2058 | |
| 74 | Phil Mercier | 3.451 | 1978-1983 | |
| 75 | Alexis Almeyda | 3.452 | 1998-2007 | |
| 76 | Erik DeRossi | 3.457 | 2020-2036 | |
| 77 | Danny Medrano | 3.458 | 1999-2004 | |
| 77 | DeAndre Mitchell | 3.458 | 2013-2027 | |
| 79 | P.T. Wakihuri | 3.470 | 2044-2056 | |
| 80 | Devin White# | 3.476 | 2046-2060 | |
| 81 | Ron Collins | 3.480 | 2018-2028 | |
| 82 | Fabien Fresi | 3.488 | 1989-2001 | |
| 83 | Dusty Riddleberger | 3.490 | 2009-2016 | |
| 83 | Dave Gibson | 3.490 | 2009-2024 | |
| 85 | Eli Howard | 3.492 | 2037-2050 | |
| 86 | Jon Jones | 3.497 | 2013-2029 | |
| 87 | Tom LaJoie | 3.501 | 2024-2039 | |
| 88 | Stu Frazier | 3.502 | 1988-1998 | |
| 89 | Víctor Alicea | 3.503 | 1983-1999 | |
| 90 | Joey Dunagan | 3.523 | 2018-2029 | |
| 91 | Terry Gould | 3.531 | 1998-2009 | |
| 92 | Johnny Dodier | 3.533 | 2020-2031 | |
| 93 | Lyman Al Gahary | 3.535 | 2048-2057 | |
| 94 | Raúl Jiménez | 3.536 | 1987-2001 | |
| 95 | Pat Adams | 3.537 | 2016-2021 | |
| 96 | Troy Clark | 3.544 | 1996-2009 | |
| 96 | Joe Valdes | 3.544 | 1978-1985 | |
| 98 | Tom Kromminga | 3.546 | 2010-2020 | |
| 99 | Jayden Howell | 3.549 | 2027-2038 | |
| 100 | Henry Ashburn# | 3.550 | 2051-2060 |
