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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Kan Kawakami | 1.102 | 2040-2051 | |
| 2 | Steve Powell | 1.187 | 2018-2038 | |
| 3 | Leo Vermeulen | 1.286 | 2064-2075 | |
| 4 | Kensaku Komatsu | 1.311 | 2008-2014 | |
| 5 | Olumide Elbeck | 1.385 | 2047-2062 | |
| 6 | Jason Bean | 1.394 | 2055-2070 | |
| 7 | Katsumoto Sakata | 1.421 | 2046-2058 | |
| 8 | Willie Carrasco | 1.467 | 2066-2079 | |
| 9 | Haruki Sakamoto | 1.543 | 2044-2055 | |
| 10 | Rob Nancekivell | 1.636 | 2034-2048 | |
| 11 | Cruz Ponce# | 1.643 | 2077-2084 | |
| 12 | Gilberto Castro | 1.653 | 2051-2060 | |
| 13 | Rusty Ward | 1.658 | 2004-2022 | |
| 14 | Ken Forbes | 1.673 | 1995-2015 | |
| 15 | Wilson Gonzáles | 1.677 | 1995-2013 | |
| 16 | John Jobin | 1.688 | 2055-2065 | |
| 17 | Arturo Covarrubias# | 1.723 | 2078-2084 | |
| 18 | Jon Chavarria | 1.728 | 2061-2074 | |
| 19 | Miguel Soto | 1.734 | 2065-2082 | |
| 20 | José López | 1.742 | 2022-2035 | |
| 21 | Ricardo Pérez | 1.759 | 1990-2002 | |
| 22 | Gonzalo Ramos | 1.766 | 1990-2005 | |
| 23 | Joseph Laramée | 1.783 | 1990-2001 | |
| 24 | Keung King | 1.788 | 2070-2082 | |
| 25 | Anthony McBride | 1.826 | 1993-2004 | |
| 26 | Ron Isham* | 1.834 | 1990-1999 | |
| 27 | Che Cannilo | 1.865 | 2017-2031 | |
| 28 | Sam Lawrence* | 1.866 | 2011-2031 | |
| 29 | Ellis Dupont | 1.878 | 2047-2060 | |
| 30 | Brian Berg | 1.898 | 2061-2072 | |
| 31 | Jessie Long | 1.914 | 2013-2026 | |
| 32 | Grant Friday | 1.929 | 2026-2037 | |
| 33 | Gonzalo Montero | 1.982 | 2026-2038 | |
| 34 | Corrado Barbarigo | 1.985 | 2033-2048 | |
| 35 | Victor Balaguer | 1.992 | 2063-2084 | |
| 36 | Alex Mijangos# | 2.030 | 2074-2084 | |
| 37 | Jeffrey Petipas | 2.042 | 2045-2061 | |
| 38 | Chalico Cavazos | 2.062 | 2052-2067 | |
| 39 | John Sutton | 2.069 | 2059-2075 | |
| 40 | Juan Mateo | 2.077 | 2053-2065 | |
| 41 | Luis Tamez | 2.090 | 2060-2077 | |
| 42 | Quinton Lamb | 2.100 | 2041-2045 | |
| 42 | Tony Tuz | 2.100 | 2050-2059 | |
| 44 | Artie Crawford | 2.106 | 2010-2024 | |
| 45 | Kenny Grant | 2.113 | 2040-2053 | |
| 46 | Andy Miao# | 2.118 | 2076-2084 | |
| 47 | Jarred Seals | 2.156 | 2055-2068 | |
| 48 | José Santos | 2.170 | 2017-2031 | |
| 49 | Artie Burch | 2.174 | 2051-2060 | |
| 50 | Nate Daniels | 2.185 | 2062-2080 | |
| 51 | Edgar Marcos | 2.189 | 2058-2074 | |
| 52 | Peter Loffgren* | 2.193 | 2036-2054 | |
| 53 | Scott Deal* | 2.196 | 2037-2057 | |
| 54 | Justin Samsel | 2.208 | 2070-2079 | |
| 55 | Ocho Aguilar | 2.217 | 2053-2065 | |
| 56 | Elmo Fasanaro | 2.227 | 2064-2081 | |
| 57 | Bobby Day* | 2.276 | 1990-2008 | |
| 58 | Mitchell Rudder* | 2.300 | 1990-2006 | |
| 59 | Marco Catenacci | 2.314 | 2054-2065 | |
| 60 | Takashi Komagai | 2.320 | 2049-2066 | |
| 61 | Marcos Castillo* | 2.323 | 2005-2022 | |
| 61 | Fakhir Tarif | 2.323 | 2063-2074 | |
| 63 | Tom Kane* | 2.333 | 2036-2051 | |
| 64 | Nelson Capristo | 2.337 | 2072-2082 | |
| 65 | Rudy Burgess | 2.348 | 2011-2021 | |
| 66 | Tomás Gómez | 2.354 | 2046-2060 | |
| 67 | Santiago Mora | 2.368 | 2046-2061 | |
| 68 | Charlie Pro* | 2.376 | 2055-2071 | |
| 69 | Kevin Meisner | 2.382 | 2042-2051 | |
| 70 | Félix Ramírez | 2.422 | 2047-2054 | |
| 71 | Jude O'Neal | 2.423 | 2019-2031 | |
| 72 | Franky Sanicencio* | 2.455 | 2051-2074 | |
| 73 | Ryosei Watanabe | 2.476 | 2045-2059 | |
| 74 | Marnolki Basteiro* | 2.480 | 2055-2071 | |
| 74 | Lorenzo Castillo | 2.480 | 2008-2021 | |
| 76 | Arthur Graves | 2.481 | 2035-2049 | |
| 77 | Reed Sentner* | 2.489 | 2024-2044 | |
| 78 | Kouji Isobe | 2.496 | 2057-2074 | |
| 79 | Clyde Rasmussen | 2.505 | 2016-2025 | |
| 80 | Jo Jo Lescaille | 2.507 | 2057-2069 | |
| 81 | Rafael Escobar# | 2.524 | 2073-2084 | |
| 82 | Kane Lancaster | 2.525 | 2067-2082 | |
| 83 | Epco Vasblom | 2.531 | 2050-2063 | |
| 84 | Travis Musumeci | 2.538 | 2060-2073 | |
| 85 | Joseph Andande* | 2.564 | 2034-2050 | |
| 85 | Alberto García | 2.564 | 2021-2036 | |
| 87 | Rafael Murillo | 2.571 | 2045-2059 | |
| 87 | Lee Murphy | 2.571 | 2014-2025 | |
| 87 | Lonnie Ward | 2.571 | 1990-2005 | |
| 90 | Mochihito Ohayashi | 2.595 | 2026-2039 | |
| 91 | Matt Galante | 2.607 | 2049-2062 | |
| 92 | Domingo Díaz | 2.613 | 1990-1997 | |
| 92 | Charles Lange | 2.613 | 2013-2018 | |
| 94 | Shaun Chugh# | 2.621 | 2075-2084 | |
| 95 | Dave Stone | 2.629 | 2031-2041 | |
| 96 | Kenji Matsumoto | 2.634 | 2035-2042 | |
| 97 | Jason Townsley | 2.640 | 2029-2046 | |
| 98 | Trent Neal | 2.650 | 1995-2016 | |
| 99 | José Cortéz | 2.653 | 2025-2029 | |
| 100 | Unto Peurajärvi | 2.656 | 2037-2056 |
