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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Noël Botiglieri | 0.916 | 1987 | |
| 2 | Rourke Veloukhiotis# | 1.267 | 2048 | |
| 3 | Vern Pearson | 1.425 | 1986 | |
| 4 | William Clouse | 1.449 | 2001 | |
| 5 | Ian Stewart | 1.469 | 2000 | |
| 6 | Edwin Solis | 1.515 | 1994 | |
| 7 | José Antonio Hernández | 1.527 | 1991 | |
| 8 | Gene Meadows | 1.530 | 1997 | |
| 9 | Francis Pena | 1.588 | 1994 | |
| 10 | Robby Johnston | 1.642 | 1989 | |
| 11 | Jack Blandine# | 1.660 | 2051 | |
| 12 | Heui-chung Pak | 1.664 | 1990 | |
| 13 | Jared Vance | 1.667 | 1992 | |
| 14 | Doug Carney | 1.680 | 1990 | |
| 15 | Raúl González | 1.721 | 1988 | |
| 16 | Pat Daniels | 1.730 | 1986 | |
| 17 | Juan Jose Román | 1.738 | 1990 | |
| 18 | John Dunbar | 1.796 | 1994 | |
| 19 | Evan Dean# | 1.807 | 2053 | |
| 20 | Clarence Halys | 1.808 | 1992 | |
| 21 | Jamie Forman | 1.818 | 1997 | |
| 22 | Jon Espaillat | 1.834 | 2008 | |
| 23 | Chet Montgomery | 1.835 | 1990 | |
| 24 | Joaquín Álvarez | 1.836 | 1988 | |
| 25 | Jimmy Neuharth | 1.849 | 2005 | |
| 26 | Ed Bytheway# | 1.850 | 2040 | |
| 27 | Adelaide Sarafana | 1.851 | 2001 | |
| 28 | Corbin Piracha# | 1.862 | 2049 | |
| 29 | Joey Bertin | 1.869 | 2003 | |
| 30 | Ed Phillips | 1.871 | 2015 | |
| 31 | Jerry Williams | 1.885 | 1989 | |
| 32 | D.J. Colbert | 1.889 | 2025 | |
| 33 | Manny Arquellez | 1.898 | 1986 | |
| 34 | Cisco Herrera | 1.901 | 1991 | |
| 35 | Dave Matney | 1.918 | 2011 | |
| 36 | Dave Koehler* | 1.924 | 2017 | |
| 37 | R.J. Curtis* | 1.937 | 1990 | |
| 38 | Raúl González | 1.942 | 1988 | |
| 39 | Jerry Loftus | 1.952 | 1989 | |
| 40 | Eros Cook | 1.960 | 1993 | |
| 41 | Tom Willhoite | 1.969 | 1999 | |
| 42 | Manny Ocampo | 1.971 | 1988 | |
| 43 | Evan Bowker# | 1.974 | 2058 | |
| 44 | Bobby Carazo | 1.987 | 2012 | |
| 45 | Gin-fan Chien | 1.994 | 1986 | |
| 46 | George Turner# | 2.003 | 2053 | |
| 47 | Fraco Archuleta | 2.010 | 1987 | |
| 48 | Stu Frazier | 2.018 | 1986 | |
| 49 | Jimmy Cogan | 2.035 | 1996 | |
| 50 | Dusty Dodd | 2.038 | 1998 | |
| 51 | Riley Geerdes# | 2.043 | 2050 | |
| 52 | Dave Osborn | 2.047 | 2035 | |
| 53 | Chad Stafford | 2.048 | 1985 | |
| 53 | Branden Soper# | 2.048 | 2043 | |
| 55 | Ted Cooley | 2.051 | 1998 | |
| 56 | Dave Bass | 2.072 | 1999 | |
| 57 | Oren Stern | 2.077 | 2041 | |
| 58 | Saxby Murray# | 2.105 | 2052 | |
| 59 | Jared Vance | 2.107 | 1993 | |
| 60 | Byung-kyu Khang | 2.109 | 1998 | |
| 61 | Tommy Fisher | 2.124 | 1992 | |
| 62 | Darrel Turner | 2.125 | 1990 | |
| 63 | Jimmy Tammaro | 2.133 | 2008 | |
| 63 | Tom Kriege | 2.133 | 2027 | |
| 65 | Manny Guzmán | 2.137 | 1988 | |
| 66 | Adrián Iturriaga | 2.147 | 1989 | |
| 67 | Kyle Perry | 2.148 | 2041 | |
| 68 | Edwin Guerrero | 2.151 | 2003 | |
| 69 | Denver Watkins | 2.165 | 1993 | |
| 70 | Rod Lyons | 2.177 | 1987 | |
| 71 | Pepe Sánchez | 2.178 | 1988 | |
| 72 | Ignacio Sanchez | 2.188 | 2009 | |
| 73 | Shusaku Inoue | 2.189 | 1989 | |
| 74 | J.R. Rozak | 2.194 | 2007 | |
| 75 | Jaden Patterson | 2.196 | 2021 | |
| 76 | Jimmy Tammaro | 2.199 | 2009 | |
| 77 | A.J. Zhovtun# | 2.210 | 2051 | |
| 78 | Pat Dimmick* | 2.211 | 1990 | |
| 79 | Doug McDowell | 2.215 | 1987 | |
| 80 | Fraco Archuleta | 2.216 | 1986 | |
| 80 | Ángel Chavez | 2.216 | 1980 | |
| 82 | Richard Velasquez | 2.221 | 2002 | |
| 83 | Robby Pearce | 2.222 | 1994 | |
| 84 | Dave Bell# | 2.233 | 2046 | |
| 84 | Cy Carter | 2.233 | 2012 | |
| 84 | Tom Hall | 2.233 | 1998 | |
| 87 | Dave Gotschall | 2.234 | 2017 | |
| 88 | Soshu Ito | 2.237 | 1987 | |
| 89 | Saxby Murray# | 2.238 | 2051 | |
| 90 | Riley Boland# | 2.244 | 2049 | |
| 91 | Jerry Murdock | 2.245 | 1989 | |
| 92 | Arturo Efugenio | 2.250 | 1980 | |
| 93 | Orien Fuentes | 2.255 | 2042 | |
| 94 | LaVaughan Yuan | 2.260 | 2045 | |
| 94 | Jeff Dimock | 2.260 | 2049 | |
| 96 | Damien Williams | 2.261 | 1997 | |
| 97 | Lonnie Powell | 2.265 | 1987 | |
| 97 | Jack Christensen | 2.265 | 2036 | |
| 99 | Tyrone Bowers | 2.269 | 1991 | |
| 100 | Monte Paredes | 2.273 | 2049 |
