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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Juan Acevedo | 2.370 | 1994 | |
| 2 | Blaine Beatty | 2.458 | 1988 | |
| 3 | Matt Shoemaker | 2.475 | 2011 | |
| 4 | Travis Blackley | 2.606 | 2003 | |
| 5 | Michael Roth | 2.623 | 2014 | |
| 6 | Randy Bockus | 2.731 | 1985 | |
| 7 | Jeff Arnold# | 2.786 | 2035 | |
| 8 | Brandon Hynick | 2.795 | 2013 | |
| 9 | Steve Bourgeois | 2.849 | 1995 | |
| 10 | Chase De Jong | 2.859 | 2016 | |
| 11 | John Barfield | 2.876 | 1988 | |
| 12 | A.J. Schugel | 2.886 | 2012 | |
| 13 | Brendan Awbrey# | 2.895 | 2032 | |
| 14 | James Needy | 2.904 | 2014 | |
| 15 | Andy Ferguson | 2.926 | 2014 | |
| 16 | Chris Noonan# | 2.927 | 2032 | |
| 17 | D.J. Houlton | 2.943 | 2004 | |
| 18 | Jeremy Hefner | 2.952 | 2010 | |
| 19 | Ricky Reyna# | 2.963 | 2026 | |
| 19 | Jeff Bittiger | 2.963 | 1982 | |
| 21 | Jim Bouton | 2.970 | 1961 | |
| 22 | Tanner Anderson | 2.974 | 2020 | |
| 23 | Matt Buschmann | 2.980 | 2008 | |
| 24 | Albert Suarez | 2.982 | 2015 | |
| 25 | Danny Collado | 2.987 | 2029 | |
| 26 | Tony Gonzalez# | 3.006 | 2032 | |
| 27 | Andy Tucker | 3.025 | 2030 | |
| 28 | Yohanse Morel | 3.030 | 2024 | |
| 29 | Bob Melquist | 3.031 | 2030 | |
| 30 | John Andre | 3.045 | 1954 | |
| 31 | Huub van Wordragen# | 3.058 | 2032 | |
| 32 | Jeriome Robertson | 3.063 | 1999 | |
| 33 | Chris Jensen | 3.143 | 2014 | |
| 34 | Garrett Richards | 3.147 | 2011 | |
| 35 | Drew Rucinski | 3.148 | 2014 | |
| 36 | Brandon Bailey | 3.154 | 2024 | |
| 37 | Alex Reese# | 3.155 | 2035 | |
| 38 | Josh Tippey# | 3.196 | 2034 | |
| 39 | Jose Rodulfo | 3.202 | 2026 | |
| 40 | Josh Geer | 3.204 | 2007 | |
| 41 | Edgar Gonzalez | 3.207 | 2020 | |
| 42 | Tim Medina# | 3.214 | 2034 | |
| 43 | Jim McKinney# | 3.220 | 2027 | |
| 44 | Mel de Leon# | 3.234 | 2030 | |
| 45 | Jose Bautista | 3.242 | 1987 | |
| 46 | Bucky Brandon | 3.250 | 1964 | |
| 47 | Manny Ramirez# | 3.280 | 2027 | |
| 48 | Bobby Rylander# | 3.290 | 2033 | |
| 49 | Dayeison Arias | 3.296 | 2026 | |
| 50 | Pat Williams# | 3.303 | 2034 | |
| 51 | Kurt Ainsworth | 3.304 | 2000 | |
| 52 | Austin Cox | 3.315 | 2020 | |
| 53 | Austin Gomber | 3.336 | 2017 | |
| 54 | Jordan Kipper | 3.353 | 2016 | |
| 54 | Johnny Navarrete | 3.353 | 2027 | |
| 56 | Kevin Solano | 3.359 | 2030 | |
| 57 | Wardquelin Vasquez | 3.367 | 2030 | |
| 58 | Christian Bergman | 3.368 | 2013 | |
| 59 | Gabriel Hernandez | 3.375 | 2030 | |
| 60 | Jaime Barria | 3.382 | 2028 | |
| 61 | Joe Winer# | 3.389 | 2032 | |
| 62 | Cesar Ramos | 3.409 | 2007 | |
| 63 | Bob Blaylock | 3.423 | 1961 | |
| 64 | Mike Birkbeck | 3.426 | 1985 | |
| 65 | Danny Then# | 3.430 | 2034 | |
| 66 | Juan Berenguer | 3.431 | 1977 | |
| 66 | Adriel Gonzalez | 3.431 | 2025 | |
| 68 | Fred Baczewski | 3.434 | 1957 | |
| 69 | Don Arlich | 3.446 | 1965 | |
| 70 | Mitch Gress | 3.447 | 2026 | |
| 71 | Eric Skoglund | 3.454 | 2016 | |
| 72 | Mike Barlow# | 3.467 | 2035 | |
| 73 | Jeff Brantley | 3.477 | 1986 | |
| 74 | Murphy Smith | 3.480 | 2013 | |
| 74 | Charlie Beamon | 3.480 | 1959 | |
| 76 | Juan Carrion# | 3.486 | 2034 | |
| 77 | Heath Fillmyer | 3.488 | 2017 | |
| 78 | Luis Patino# | 3.493 | 2020 | |
| 79 | Mike Lipps | 3.497 | 2028 | |
| 80 | Graham Godfrey | 3.502 | 2009 | |
| 81 | Don Bradey | 3.511 | 1961 | |
| 82 | Daniel Ponce de Leon | 3.517 | 2016 | |
| 83 | Donn Roach | 3.533 | 2013 | |
| 84 | Jim Archer | 3.541 | 1958 | |
| 85 | Dave Bakenhaster | 3.549 | 1967 | |
| 86 | Tom Baker | 3.560 | 1959 | |
| 87 | Josh Geer | 3.585 | 2014 | |
| 88 | Willie Delgado# | 3.587 | 2036 | |
| 89 | Ernesto Frieri | 3.591 | 2009 | |
| 90 | Keegan Akin | 3.600 | 2021 | |
| 91 | Tim Heath# | 3.607 | 2030 | |
| 92 | Tyler Driver | 3.612 | 2027 | |
| 93 | Reese Olson | 3.616 | 2024 | |
| 94 | Josh Woodward | 3.631 | 2028 | |
| 95 | Justin Brown | 3.637 | 2025 | |
| 96 | Danny LaBruna# | 3.638 | 2032 | |
| 97 | Shawn Sedlacek | 3.656 | 2000 | |
| 98 | Scott Anderson | 3.665 | 1985 | |
| 99 | Brad Knox | 3.667 | 2006 | |
| 100 | Jake Woolfork# | 3.671 | 2032 |
