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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Paço Estaa | 1.850 | 2052-2065 | |
| 2 | Mark Davidson | 1.925 | 2054-2068 | |
| 3 | Roberto Maillot* | 1.930 | 2013-2027 | |
| 4 | Tony Jackson | 2.203 | 2013-2027 | |
| 5 | Nathan Stone# | 2.230 | 2063-2068 | |
| 6 | Bob Jones* | 2.278 | 2016-2036 | |
| 7 | Byron Newbold | 2.313 | 2013-2027 | |
| 8 | Bob Grant* | 2.423 | 2034-2046 | |
| 9 | Ronman Tierney# | 2.478 | 2062-2068 | |
| 10 | Billy Snow# | 2.483 | 2058-2068 | |
| 11 | Dave Utley# | 2.504 | 2062-2068 | |
| 11 | Edgardo Pacheco | 2.504 | 2052-2064 | |
| 13 | Kevin Koch# | 2.587 | 2052-2068 | |
| 14 | Phil Adams# | 2.624 | 2061-2068 | |
| 15 | Raul Arvelos# | 2.668 | 2054-2068 | |
| 16 | Gary Bazar# | 2.687 | 2058-2068 | |
| 17 | Nelson Padilla# | 2.717 | 2057-2068 | |
| 18 | Dan Sampson# | 2.767 | 2056-2068 | |
| 19 | Ken Daniels | 2.768 | 2043-2058 | |
| 20 | Valentyn Quarenta# | 2.772 | 2056-2068 | |
| 21 | Ron Taylor* | 2.783 | 2013-2037 | |
| 22 | Ed Johnson | 2.798 | 2022-2036 | |
| 23 | Rod O'Colgan* | 2.830 | 2014-2035 | |
| 24 | Bobby Etheridge# | 2.845 | 2052-2068 | |
| 25 | Ned Haas* | 2.847 | 2013-2026 | |
| 26 | Johnny Parker# | 2.855 | 2057-2068 | |
| 27 | Lou Moore | 2.864 | 2036-2050 | |
| 28 | Cam Dean | 2.866 | 2022-2042 | |
| 29 | Ben Kaiser# | 2.867 | 2056-2068 | |
| 30 | José Noriega# | 2.870 | 2054-2068 | |
| 31 | Alex Moran# | 2.871 | 2060-2068 | |
| 32 | Greg Schaffner# | 2.885 | 2063-2068 | |
| 33 | Judite Aldeinha# | 2.901 | 2058-2068 | |
| 34 | Jorge Montoya | 2.907 | 2013-2026 | |
| 35 | Jorge Sepúlveda* | 2.908 | 2013-2023 | |
| 36 | Giel Wiegman# | 2.914 | 2062-2068 | |
| 37 | Frank Salerno# | 2.918 | 2064-2068 | |
| 38 | Jeff Todd# | 2.941 | 2053-2068 | |
| 39 | Al West# | 2.970 | 2059-2068 | |
| 40 | Louie Dower | 2.971 | 2022-2040 | |
| 41 | Mario Quintana# | 2.974 | 2059-2068 | |
| 42 | Ed Cobb# | 2.986 | 2058-2068 | |
| 43 | Pete Bridges | 2.990 | 2054-2067 | |
| 44 | Greg Kelley# | 3.004 | 2057-2068 | |
| 45 | Orlando Árias | 3.016 | 2042-2053 | |
| 46 | P.J. Phillips | 3.030 | 2013-2028 | |
| 47 | Jiu-ling Kan# | 3.048 | 2059-2068 | |
| 48 | Pete Wilson* | 3.059 | 2022-2035 | |
| 49 | Tony Trejo# | 3.060 | 2060-2068 | |
| 50 | Tony Young* | 3.070 | 2016-2031 | |
| 51 | Greg Lloyd# | 3.080 | 2064-2068 | |
| 52 | Chris Norris | 3.086 | 2014-2032 | |
| 53 | Eric King | 3.087 | 2050-2064 | |
| 54 | Norberto León* | 3.094 | 2013-2026 | |
| 55 | Tony Perez# | 3.101 | 2059-2068 | |
| 56 | Leveni Kioniko# | 3.103 | 2057-2068 | |
| 57 | Jonathan Quintana# | 3.113 | 2059-2068 | |
| 58 | Isaias van Opstal# | 3.124 | 2061-2068 | |
| 59 | César Martínez | 3.129 | 2052-2066 | |
| 60 | Álex Pacheco* | 3.130 | 2034-2052 | |
| 61 | Mario Cardenas | 3.132 | 2035-2044 | |
| 62 | Kei-thing Xiang# | 3.137 | 2055-2068 | |
| 63 | Bin Zhu | 3.145 | 2013-2020 | |
| 63 | Oscar Gomez# | 3.145 | 2061-2068 | |
| 65 | Dennis Ackerstrom# | 3.149 | 2060-2068 | |
| 66 | Danny Chavez# | 3.151 | 2060-2068 | |
| 67 | Jon Cupit | 3.158 | 2055-2064 | |
| 68 | Tony Britt# | 3.161 | 2058-2068 | |
| 69 | Benoît Pélissier | 3.164 | 2017-2030 | |
| 70 | Chris Steiner# | 3.165 | 2062-2066 | |
| 71 | Ed Gillberry# | 3.166 | 2064-2068 | |
| 72 | Jonathan Wiley | 3.167 | 2028-2042 | |
| 73 | Josh Bang# | 3.168 | 2063-2068 | |
| 73 | Konosuke Kodo | 3.168 | 2037-2052 | |
| 75 | António Goudino | 3.170 | 2037-2047 | |
| 76 | Danny Garza# | 3.173 | 2064-2068 | |
| 77 | Jeff Locke | 3.184 | 2045-2058 | |
| 78 | Rob Glover# | 3.187 | 2056-2068 | |
| 79 | Tim Weaver | 3.208 | 2018-2031 | |
| 80 | Glen McCarty | 3.216 | 2013-2022 | |
| 81 | Phil Baker* | 3.227 | 2019-2037 | |
| 81 | Rubén Ortega | 3.227 | 2032-2041 | |
| 83 | Sam Johnson | 3.234 | 2052-2067 | |
| 84 | Curt Peterson | 3.240 | 2030-2046 | |
| 85 | Willie Salazar# | 3.247 | 2056-2068 | |
| 86 | Dan Lawson | 3.254 | 2057-2065 | |
| 86 | Dan Butler | 3.254 | 2022-2039 | |
| 88 | José Meléndez* | 3.255 | 2026-2044 | |
| 89 | Aurelio García | 3.259 | 2028-2038 | |
| 90 | Joe Haines | 3.274 | 2013-2020 | |
| 91 | Ed Branch | 3.275 | 2055-2066 | |
| 92 | Nate Mulholland | 3.285 | 2051-2068 | |
| 93 | Dave Haug* | 3.304 | 2017-2036 | |
| 94 | Curt Kennedy | 3.310 | 2020-2035 | |
| 95 | Johnny Henry | 3.313 | 2013-2026 | |
| 96 | Norm Brown | 3.315 | 2034-2040 | |
| 97 | Leonardo Mendoza* | 3.320 | 2038-2052 | |
| 98 | Alan Carpenter | 3.327 | 2046-2062 | |
| 99 | Mike Rice | 3.334 | 2047-2063 | |
| 100 | Joe Heyward | 3.346 | 2013-2026 |
