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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Clarence Milligan | 1.586 | 1979 | |
| 2 | Elliot Buck | 2.151 | 1970 | |
| 3 | Michael McJannett | 2.169 | 1979 | |
| 4 | Ryan Beasley | 2.282 | 1997 | |
| 5 | José Martínez | 2.297 | 1973 | |
| 6 | José Mejía | 2.445 | 1979 | |
| 7 | Claudio Lumbrera | 2.473 | 1979 | |
| 8 | Mark McRudds | 2.539 | 1974 | |
| 9 | Claudio Lumbrera | 2.565 | 1978 | |
| 10 | Sal Hughes | 2.587 | 1974 | |
| 11 | Scott Robinson | 2.601 | 1978 | |
| 12 | Joe Flowers | 2.617 | 1970 | |
| 13 | Carlos Martínez | 2.650 | 1974 | |
| 14 | Nathaniel Thompson | 2.678 | 1997 | |
| 14 | Alex Roberts | 2.678 | 1983 | |
| 16 | Matt Wilson | 2.682 | 1970 | |
| 17 | David Randolph | 2.686 | 1970 | |
| 18 | Jack Brown | 2.700 | 2014 | |
| 19 | Dave O'Devin | 2.705 | 1998 | |
| 20 | Wilber Shaw | 2.716 | 1970 | |
| 21 | Kyle Rogers | 2.738 | 1979 | |
| 22 | Mario Estrada | 2.744 | 1978 | |
| 23 | Ralph Wilson | 2.756 | 1992 | |
| 24 | Nathan Beaumond | 2.770 | 1992 | |
| 25 | Juan Martínez | 2.798 | 1980 | |
| 26 | Lorenzo Rentería | 2.800 | 1973 | |
| 27 | Vicente Yzquierdo | 2.804 | 1970 | |
| 28 | Rory Mennie | 2.805 | 1983 | |
| 29 | Justin Carey | 2.845 | 1974 | |
| 30 | Brendan Farris | 2.853 | 1971 | |
| 31 | Miguel Germán# | 2.859 | 2009 | |
| 32 | Matt Brown | 2.878 | 1976 | |
| 33 | Alberto Romano | 2.890 | 1972 | |
| 34 | Bartolo García | 2.898 | 2010 | |
| 35 | Jim Pérez | 2.902 | 1973 | |
| 36 | Cisco Martínez | 2.906 | 1993 | |
| 37 | Robert Hurley | 2.913 | 1976 | |
| 38 | Theron Clark | 2.915 | 2009 | |
| 39 | Gordon Robertson# | 2.955 | 2020 | |
| 40 | Darren Atkins | 2.962 | 1977 | |
| 41 | Juan Martínez | 2.969 | 1994 | |
| 42 | John Stark | 2.980 | 1975 | |
| 43 | Wilton McKee | 2.987 | 1971 | |
| 44 | Mike McDonald | 2.995 | 2002 | |
| 45 | Craig Mullen | 3.015 | 1996 | |
| 45 | Felipe Pérez | 3.015 | 1984 | |
| 47 | John Moss | 3.023 | 2017 | |
| 48 | Phil Marshall | 3.024 | 1992 | |
| 48 | Billy Wagner | 3.024 | 1995 | |
| 50 | Carlos Jiménez | 3.026 | 1971 | |
| 51 | Andrés Rodríguez | 3.029 | 1992 | |
| 52 | Arnold McCoy | 3.040 | 1975 | |
| 53 | Michael Hudson | 3.043 | 1972 | |
| 54 | Junior Malone | 3.050 | 1998 | |
| 55 | Javier Barrios | 3.058 | 1985 | |
| 56 | Raymond Mateer | 3.071 | 1970 | |
| 57 | Paco Maldonado | 3.072 | 1977 | |
| 58 | Norman Banks | 3.081 | 1985 | |
| 59 | Porter Barker# | 3.089 | 2022 | |
| 60 | Jeff Swann | 3.092 | 1977 | |
| 61 | Rick Schultz | 3.101 | 1977 | |
| 62 | Manuel Castro | 3.104 | 1972 | |
| 63 | Miguel Vela | 3.108 | 1972 | |
| 64 | Justin Carey | 3.111 | 1973 | |
| 65 | Edward Morgan# | 3.112 | 2019 | |
| 66 | Norberto Martínez | 3.120 | 1970 | |
| 67 | Donald Johnston | 3.128 | 1994 | |
| 67 | Ronald Johnson | 3.128 | 1995 | |
| 67 | Alberto Ramos | 3.128 | 1970 | |
| 70 | Amayas Ligongo | 3.133 | 2014 | |
| 71 | Don Waters | 3.135 | 1975 | |
| 72 | Jim Garrett | 3.154 | 1985 | |
| 72 | Harry Crippen | 3.154 | 1974 | |
| 72 | Ken Bean# | 3.154 | 2022 | |
| 75 | Tony Parker | 3.156 | 1979 | |
| 76 | Nils van Ineveld | 3.168 | 1977 | |
| 77 | Dylan Harris | 3.174 | 1974 | |
| 78 | Wilson Fernández | 3.182 | 1970 | |
| 79 | Rod Reynolds | 3.184 | 1986 | |
| 80 | Steve Webb | 3.189 | 2001 | |
| 81 | Bartolo Rodríguez | 3.211 | 1970 | |
| 82 | Paul Blackmore | 3.217 | 1974 | |
| 83 | Nicholas Hamilton | 3.242 | 1974 | |
| 83 | José Badía# | 3.242 | 2022 | |
| 85 | Flynn Davis | 3.250 | 2019 | |
| 86 | Mike Miller | 3.253 | 1970 | |
| 87 | Dan Griffin | 3.254 | 1972 | |
| 88 | Tim Moore | 3.261 | 1993 | |
| 89 | Ed Redd | 3.271 | 1980 | |
| 90 | Arnold McCoy | 3.285 | 1974 | |
| 90 | Ethan Whitaker | 3.285 | 1985 | |
| 92 | Tim Wall | 3.291 | 1989 | |
| 93 | Eric Carter | 3.292 | 1983 | |
| 94 | Sam Hughes | 3.301 | 1986 | |
| 95 | Steve Hanna | 3.305 | 1971 | |
| 95 | Cristo Pineda | 3.305 | 1975 | |
| 97 | Luis Baker | 3.314 | 1980 | |
| 98 | Matt Palmer | 3.320 | 1971 | |
| 99 | Clyde Brown | 3.321 | 1975 | |
| 100 | Kevin Davis | 3.334 | 1979 |
