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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Ted Spears | 2.179 | 2010 | |
| 2 | Curt Lucas | 2.374 | 2015 | |
| 3 | Rafael Santillanenz | 2.404 | 2014 | |
| 4 | Randy Stagg | 2.450 | 2013 | |
| 5 | César Martínez | 2.485 | 2015 | |
| 6 | Sugimoto Kuhabara | 2.586 | 2010 | |
| 7 | Koshiro Shibutani | 2.606 | 2010 | |
| 8 | Ze-min Tong | 2.635 | 2012 | |
| 9 | David Miller | 2.761 | 2010 | |
| 10 | Alfonso Gutiérrez | 2.771 | 2012 | |
| 11 | Tak-hing Fei | 2.787 | 2011 | |
| 12 | José Orozco | 2.835 | 2010 | |
| 13 | Alfred Carty | 2.967 | 2017 | |
| 14 | Donald Brewer | 2.969 | 2015 | |
| 15 | Kiyomitsu Fujii | 2.985 | 2021 | |
| 16 | Jun Kawashima | 3.005 | 2027 | |
| 17 | Marty Twombly | 3.015 | 2014 | |
| 18 | Iván Romero# | 3.036 | 2037 | |
| 19 | Ted Spears | 3.065 | 2011 | |
| 20 | Alfred Carty | 3.087 | 2011 | |
| 21 | Ron Eager | 3.099 | 2009 | |
| 22 | Rod Adams | 3.140 | 2021 | |
| 23 | Octávio Miranda | 3.146 | 2007 | |
| 24 | Alfonso Medro | 3.166 | 2011 | |
| 25 | Norberto Méndez | 3.174 | 2025 | |
| 26 | Raúl Castillo | 3.226 | 2011 | |
| 27 | Mario García | 3.237 | 2008 | |
| 28 | Nick Reed | 3.244 | 2011 | |
| 29 | León Varela# | 3.251 | 2035 | |
| 30 | Eduardo Martínez | 3.260 | 2018 | |
| 31 | Jim Sheppard | 3.270 | 2027 | |
| 32 | Jason Jensen | 3.280 | 2007 | |
| 33 | John Stricker | 3.298 | 2011 | |
| 34 | Paul Niblett | 3.305 | 2012 | |
| 35 | Octávio Miranda | 3.339 | 2011 | |
| 36 | Bartolo Romo | 3.362 | 2018 | |
| 37 | Beau Richards | 3.381 | 2017 | |
| 38 | Li-xue Si-ma | 3.387 | 2018 | |
| 39 | Mark Blanton | 3.400 | 2015 | |
| 40 | Horace Jacobs# | 3.403 | 2036 | |
| 41 | José Castro | 3.406 | 2017 | |
| 42 | Luis Pregaso | 3.440 | 2009 | |
| 43 | Tim Harmon | 3.442 | 2022 | |
| 44 | Scott Conklin | 3.469 | 2018 | |
| 45 | Mike Belcher | 3.477 | 2007 | |
| 46 | Enrique Valdés | 3.494 | 2025 | |
| 47 | Bang-xao Lam | 3.505 | 2013 | |
| 48 | Yeow-whye Liang | 3.514 | 2012 | |
| 49 | Mark Schroeder | 3.520 | 2008 | |
| 49 | Scott Dyer | 3.520 | 2019 | |
| 51 | Alberto Márquez | 3.527 | 2029 | |
| 52 | Tso-lin Kuo | 3.536 | 2009 | |
| 53 | Adrián León | 3.547 | 2022 | |
| 54 | Jing-xiang Fa | 3.578 | 2029 | |
| 55 | Kelly Haynes | 3.600 | 2009 | |
| 56 | Dan Holden | 3.606 | 2008 | |
| 57 | Glen Jones | 3.611 | 2018 | |
| 58 | Carlos Arévalo | 3.621 | 2008 | |
| 59 | Jorge Crus | 3.631 | 2013 | |
| 60 | Myron Hawkins | 3.632 | 2008 | |
| 61 | Mike Stabler | 3.644 | 2023 | |
| 62 | Ray Day | 3.649 | 2016 | |
| 63 | Scott Dyer | 3.650 | 2014 | |
| 64 | Koshiro Shibutani | 3.655 | 2011 | |
| 65 | Millard Curtis# | 3.668 | 2027 | |
| 66 | Troy Hensley | 3.672 | 2014 | |
| 67 | Teruo Sato | 3.684 | 2023 | |
| 68 | Cisco González | 3.698 | 2013 | |
| 69 | Michael Puckett | 3.708 | 2017 | |
| 70 | Nelson Béltre# | 3.710 | 2029 | |
| 71 | Jason Jensen | 3.721 | 2008 | |
| 72 | Jim Hendon | 3.723 | 2021 | |
| 73 | Joe MacAslan# | 3.727 | 2038 | |
| 74 | Cisco Cota | 3.729 | 2008 | |
| 75 | Kisho Kichida | 3.732 | 2022 | |
| 76 | Yasuyuki Ishii | 3.733 | 2023 | |
| 77 | Jim DeWitt | 3.737 | 2014 | |
| 78 | Artie Hoffman | 3.740 | 2020 | |
| 79 | Alberto Márquez | 3.747 | 2027 | |
| 80 | Dustin Velásquez# | 3.763 | 2033 | |
| 81 | Ze-dong Quian | 3.781 | 2014 | |
| 81 | Jim Sheppard | 3.781 | 2026 | |
| 83 | Bryan Avery | 3.800 | 2019 | |
| 84 | Jim Kennedy | 3.801 | 2013 | |
| 85 | Dan Allen | 3.810 | 2014 | |
| 86 | Norberto Méndez | 3.811 | 2022 | |
| 86 | Randy Griffin | 3.811 | 2007 | |
| 88 | Christian Livingston | 3.819 | 2012 | |
| 89 | Scott Conklin | 3.821 | 2019 | |
| 90 | Gerald Williams | 3.828 | 2009 | |
| 91 | José Mercado | 3.830 | 2012 | |
| 92 | Artie Skinner | 3.841 | 2016 | |
| 93 | Bob Cunningham | 3.844 | 2036 | |
| 94 | Troy Hensley | 3.845 | 2012 | |
| 95 | Ron Robertson | 3.851 | 2018 | |
| 96 | Edgardo González | 3.852 | 2014 | |
| 97 | Ben Moody | 3.857 | 2022 | |
| 98 | Bryan Avery | 3.875 | 2015 | |
| 99 | José Leyva# | 3.876 | 2034 | |
| 100 | Taizo Suzuki | 3.887 | 2007 |
