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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Freddy López | 0.287 | 2022-2034 | |
| 2 | Steve Robinson | 0.939 | 2017-2034 | |
| 3 | António Tapia | 1.200 | 2013-2020 | |
| 4 | Jorge Maldonado# | 1.219 | 2058-2065 | |
| 5 | Mark Davidson# | 1.299 | 2054-2065 | |
| 6 | Steve Chapman | 1.500 | 2044-2054 | |
| 6 | John Snelgrove | 1.500 | 2024-2035 | |
| 8 | Edgardo Rosas | 1.510 | 2025-2042 | |
| 9 | Nate Shawler# | 1.705 | 2059-2065 | |
| 10 | Tony Trejo# | 1.773 | 2060-2065 | |
| 11 | José Manuiz | 1.780 | 2026-2042 | |
| 12 | Johnny Riley | 1.837 | 2045-2058 | |
| 13 | Jonathan Quintana# | 1.884 | 2059-2065 | |
| 14 | Don MacGruder | 1.909 | 2023-2036 | |
| 15 | Greg Kelley# | 1.910 | 2057-2065 | |
| 16 | Raul Arvelos# | 1.929 | 2054-2065 | |
| 16 | Chi-ming Liu | 1.929 | 2038-2051 | |
| 18 | José Estrada | 2.019 | 2030-2044 | |
| 18 | Chris May | 2.019 | 2042-2052 | |
| 20 | Dan Lawson# | 2.077 | 2057-2065 | |
| 21 | Cam Dean | 2.097 | 2022-2042 | |
| 22 | António Vásquez | 2.104 | 2048-2059 | |
| 23 | Mike Russell | 2.113 | 2024-2041 | |
| 24 | Cipriano Hernández | 2.116 | 2014-2027 | |
| 25 | Don Cahill | 2.132 | 2044-2052 | |
| 26 | Matt Hager# | 2.136 | 2062-2065 | |
| 27 | Willie Watson | 2.195 | 2013-2030 | |
| 28 | Ed Cobb# | 2.222 | 2058-2065 | |
| 29 | Tony Ríos | 2.229 | 2037-2049 | |
| 30 | Ned Haas* | 2.242 | 2013-2026 | |
| 31 | Paço Estaa# | 2.250 | 2052-2065 | |
| 32 | Aurelio García | 2.282 | 2028-2038 | |
| 33 | Gary Lopez# | 2.292 | 2057-2065 | |
| 34 | Ben Jones | 2.306 | 2023-2036 | |
| 35 | Kyle Mendelson# | 2.342 | 2057-2065 | |
| 36 | Jorge Sepúlveda* | 2.365 | 2013-2023 | |
| 37 | Chris Norris | 2.387 | 2014-2032 | |
| 38 | Dave Haug* | 2.394 | 2017-2036 | |
| 39 | Joe Heyward | 2.455 | 2013-2026 | |
| 40 | Héctor Gonzáles | 2.459 | 2036-2051 | |
| 41 | Andy Wright | 2.480 | 2049-2054 | |
| 42 | Bob Jones* | 2.488 | 2016-2036 | |
| 43 | José Suárez# | 2.496 | 2056-2065 | |
| 44 | Mario Quintana# | 2.500 | 2059-2065 | |
| 45 | Nelson Padilla# | 2.508 | 2057-2065 | |
| 46 | Byron Newbold | 2.512 | 2013-2027 | |
| 47 | Jong-beom Kum | 2.517 | 2050-2057 | |
| 48 | Juan Santiago | 2.519 | 2046-2055 | |
| 49 | Rod Bond | 2.560 | 2024-2040 | |
| 50 | Bobby Burnett | 2.566 | 2018-2035 | |
| 51 | Valentyn Quarenta# | 2.580 | 2056-2065 | |
| 52 | Tony Young* | 2.589 | 2016-2031 | |
| 53 | Don Godfrey | 2.602 | 2049-2061 | |
| 54 | Owen Suarez# | 2.613 | 2064-2065 | |
| 54 | Aurelio Villarreal | 2.613 | 2038-2051 | |
| 56 | Micheal McCoy | 2.617 | 2019-2037 | |
| 57 | Jorge Rivera | 2.640 | 2029-2037 | |
| 58 | Pat Benton | 2.641 | 2013-2020 | |
| 58 | Tony Faulkner | 2.641 | 2049-2063 | |
| 60 | Mike Harris# | 2.643 | 2052-2064 | |
| 61 | Greg Medici# | 2.652 | 2062-2065 | |
| 62 | Nick Wilcox# | 2.673 | 2057-2064 | |
| 63 | Joe Berry | 2.700 | 2035-2046 | |
| 63 | Dennis Ackerstrom# | 2.700 | 2060-2065 | |
| 63 | Frank Salerno# | 2.700 | 2064-2065 | |
| 66 | Mike Powell | 2.706 | 2024-2034 | |
| 67 | Rob Kirby | 2.723 | 2014-2025 | |
| 67 | Chris Roberson | 2.723 | 2034-2046 | |
| 69 | Bob Cook | 2.752 | 2016-2028 | |
| 70 | Dian Alisjahbana | 2.755 | 2022-2036 | |
| 71 | Lonnie Simmons | 2.764 | 2013-2023 | |
| 72 | Phil Adams# | 2.789 | 2061-2065 | |
| 73 | Joe Haines | 2.827 | 2013-2020 | |
| 74 | Florante Marrald | 2.834 | 2014-2032 | |
| 75 | P.J. Phillips | 2.842 | 2013-2028 | |
| 76 | Rod O'Colgan* | 2.846 | 2014-2035 | |
| 77 | Maddox Hynes | 2.883 | 2013-2023 | |
| 78 | Chris Wilson | 2.893 | 2030-2040 | |
| 79 | Loeck Langelaan | 2.898 | 2030-2046 | |
| 80 | Shinji Nakao* | 2.912 | 2038-2049 | |
| 81 | Jesús Cruz* | 2.913 | 2038-2052 | |
| 82 | Chris Beard | 2.919 | 2023-2040 | |
| 83 | Jeff Todd# | 2.922 | 2053-2065 | |
| 84 | Ronman Tierney# | 2.969 | 2062-2065 | |
| 85 | Milo Thompson | 2.972 | 2051-2059 | |
| 85 | Jonathan Wiley | 2.972 | 2028-2042 | |
| 87 | Chris McCarthy | 2.976 | 2013-2019 | |
| 88 | Kazu Kato | 3.000 | 2035-2047 | |
| 89 | Dani Romero | 3.013 | 2037-2050 | |
| 90 | Brad Chandler | 3.015 | 2052-2060 | |
| 91 | Curt Peterson | 3.018 | 2030-2046 | |
| 92 | Shawn De La Garza | 3.024 | 2028-2039 | |
| 93 | Freddie Taylor | 3.052 | 2013-2025 | |
| 94 | Ron Taylor* | 3.060 | 2013-2037 | |
| 95 | José Meléndez* | 3.067 | 2026-2044 | |
| 96 | Steve Forbes | 3.081 | 2022-2038 | |
| 96 | Alex Moran# | 3.081 | 2060-2065 | |
| 98 | Steve Helms | 3.096 | 2029-2040 | |
| 98 | Johnny Parker# | 3.096 | 2057-2065 | |
| 100 | Koryusai Kawaguchi# | 3.098 | 2055-2063 |
