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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Zenko Okada# | 0.000 | 2028 | |
| 1 | Rusty Hughes# | 0.000 | 2037 | |
| 1 | Zander Eichhorn | 0.000 | 2009 | |
| 1 | León Vega# | 0.000 | 2038 | |
| 5 | Yoshiaga Takahashi# | 0.360 | 2039 | |
| 6 | Orlando Trujillo# | 0.450 | 2026 | |
| 7 | Alberto González | 0.482 | 2025 | |
| 8 | Kyu-cheol Na# | 0.491 | 2028 | |
| 9 | Chi-ming Xian | 0.500 | 2014 | |
| 10 | Yajirobei Matsunaga# | 0.562 | 2033 | |
| 11 | Albert Thomas | 0.587 | 2008 | |
| 12 | Tsurayuki Harada# | 0.593 | 2030 | |
| 13 | Juan Santana | 0.600 | 2023 | |
| 14 | Lou Butler# | 0.692 | 2030 | |
| 15 | Juan Guerrero# | 0.730 | 2030 | |
| 16 | Oliver González | 0.740 | 2016 | |
| 17 | Fred Benjamin | 0.761 | 2012 | |
| 18 | Brian Clark# | 0.783 | 2030 | |
| 19 | José Martínez# | 0.818 | 2026 | |
| 20 | Skip Hathaway# | 0.857 | 2033 | |
| 21 | Gui-fei Yip# | 0.871 | 2037 | |
| 22 | Min-zhong Lou# | 0.885 | 2035 | |
| 23 | Adam Pemberton# | 1.029 | 2039 | |
| 24 | Jimmy Reynolds# | 1.038 | 2035 | |
| 25 | Henry Cluett# | 1.149 | 2030 | |
| 26 | Pedro González | 1.200 | 2030 | |
| 27 | Jim Norris | 1.227 | 2032 | |
| 28 | Sebastiaan de Roode# | 1.262 | 2032 | |
| 29 | Alfredo Reyes | 1.301 | 2027 | |
| 30 | Barney Stevens | 1.306 | 2028 | |
| 30 | Félix Reyes | 1.306 | 2037 | |
| 32 | Andrew Burns | 1.350 | 2023 | |
| 32 | Paul Newman | 1.350 | 2022 | |
| 34 | José Flores# | 1.392 | 2034 | |
| 35 | René Padilla# | 1.436 | 2034 | |
| 36 | Monzaemon Nakashima# | 1.467 | 2032 | |
| 37 | Juan Jaramillo# | 1.521 | 2034 | |
| 38 | Yuji Yamashita# | 1.552 | 2032 | |
| 38 | Roberto Ruíz# | 1.552 | 2034 | |
| 40 | León Vallés | 1.558 | 2009 | |
| 41 | José Salas# | 1.565 | 2037 | |
| 42 | Sebastiaan de Roode# | 1.588 | 2033 | |
| 43 | Finlay MacEwan# | 1.620 | 2037 | |
| 44 | Jorge Flores# | 1.627 | 2033 | |
| 45 | Alfred Hall# | 1.667 | 2038 | |
| 46 | Júlio Domínguez# | 1.688 | 2037 | |
| 47 | Pedro Vega | 1.723 | 2024 | |
| 47 | Yoshitora Yamakage | 1.723 | 2026 | |
| 49 | Erik Watson | 1.728 | 2039 | |
| 50 | Soetsu Hirai | 1.753 | 2024 | |
| 51 | Joe Russell# | 1.761 | 2037 | |
| 51 | Naohiro Seki# | 1.761 | 2039 | |
| 53 | Iemitsu Kato# | 1.776 | 2037 | |
| 54 | Júlio Herrera# | 1.800 | 2037 | |
| 54 | Júlio Torres | 1.800 | 2014 | |
| 54 | Tommy Atkins# | 1.800 | 2037 | |
| 54 | Carlos Herrera# | 1.800 | 2038 | |
| 58 | Cameron Auchmulty# | 1.831 | 2037 | |
| 59 | Kyle Tatham | 1.849 | 2025 | |
| 60 | Domingo Vázquez | 1.862 | 2028 | |
| 61 | Domingo Vázquez | 1.964 | 2036 | |
| 62 | Dean Makepeace# | 1.976 | 2032 | |
| 62 | Andrés Rodríguez# | 1.976 | 2030 | |
| 62 | Héctor Colomo# | 1.976 | 2036 | |
| 65 | Addisu Zeroual# | 2.000 | 2036 | |
| 65 | Luis Miguel Freitas# | 2.000 | 2035 | |
| 67 | Huibrecht Ubbens | 2.032 | 2032 | |
| 68 | Pasquale Richelmi# | 2.077 | 2038 | |
| 69 | Pedro Torres# | 2.113 | 2038 | |
| 70 | Todd Gustafson | 2.118 | 2029 | |
| 71 | Bartolo García | 2.143 | 2023 | |
| 72 | José Tojeira# | 2.148 | 2030 | |
| 73 | Tsurayuki Harada# | 2.219 | 2029 | |
| 74 | Chad Stewart | 2.250 | 2022 | |
| 74 | Kyung-tae Yi# | 2.250 | 2038 | |
| 76 | Roderick Davis | 2.277 | 2033 | |
| 77 | Félix Rosales# | 2.288 | 2037 | |
| 77 | Brandon Nichols# | 2.288 | 2037 | |
| 79 | Armando Sánchez# | 2.314 | 2036 | |
| 80 | Millard Norman | 2.368 | 2024 | |
| 81 | Nathan O'Reilly | 2.400 | 2013 | |
| 82 | Felipe Aguilera# | 2.483 | 2037 | |
| 83 | Ronnie Ruíz | 2.500 | 2033 | |
| 83 | Gary Walker | 2.500 | 2026 | |
| 85 | Barney Stone# | 2.505 | 2038 | |
| 86 | Fernando García | 2.547 | 2032 | |
| 87 | Robby Wiggins | 2.596 | 2029 | |
| 88 | José Ríos# | 2.613 | 2024 | |
| 89 | Alfredo Zambrano | 2.625 | 2023 | |
| 90 | Pat Green | 2.647 | 2011 | |
| 91 | Adam Pemberton# | 2.700 | 2038 | |
| 91 | Adam Pemberton# | 2.700 | 2037 | |
| 91 | Roberto Ruíz# | 2.700 | 2035 | |
| 94 | Barney Swanson# | 2.725 | 2038 | |
| 95 | Manuel Gómez | 2.739 | 2010 | |
| 96 | Kevin Thomas | 2.779 | 2033 | |
| 97 | León Vallés | 2.812 | 2011 | |
| 98 | Skip Hathaway# | 2.842 | 2034 | |
| 98 | Jesús Salazar# | 2.842 | 2031 | |
| 98 | António Ávila | 2.842 | 2031 |
