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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Skip Bailey | 1.688 | 2011 | |
| 2 | Joe Huff | 2.000 | 1987 | |
| 3 | Jeff Miller | 2.026 | 1971 | |
| 4 | Mike Funk | 2.038 | 1978 | |
| 5 | Juan García | 2.057 | 1970 | |
| 6 | Tony Ramírez# | 2.104 | 2022 | |
| 7 | Ralph Small | 2.142 | 1970 | |
| 8 | Colby Dale | 2.164 | 1976 | |
| 9 | Juan Ortega | 2.169 | 1970 | |
| 9 | Ralph Small | 2.169 | 1971 | |
| 11 | Javier Rosales | 2.193 | 1978 | |
| 12 | Geoff Kent | 2.195 | 1972 | |
| 13 | Darren Brown# | 2.218 | 2017 | |
| 14 | Vicente Rodríguez | 2.228 | 2010 | |
| 15 | Jeff DeWalt | 2.231 | 1988 | |
| 16 | Mitch Watson | 2.234 | 1970 | |
| 17 | Tony López# | 2.235 | 2017 | |
| 18 | Richard Corbin | 2.284 | 1978 | |
| 19 | Jon Gentry | 2.314 | 1980 | |
| 20 | Seth Williams | 2.318 | 1993 | |
| 21 | Joseph Jones | 2.341 | 2007 | |
| 21 | Morgan Briggs | 2.341 | 1970 | |
| 21 | Matt White | 2.341 | 1975 | |
| 24 | David Knight | 2.386 | 1972 | |
| 25 | Roberto Castro | 2.409 | 1972 | |
| 26 | Juan Ortega | 2.415 | 1973 | |
| 27 | Pat Martin | 2.419 | 1975 | |
| 28 | Steve Hanson | 2.424 | 1973 | |
| 29 | Pat Martin | 2.464 | 1976 | |
| 30 | Anastasio Gonzáles | 2.465 | 2010 | |
| 31 | Guillermo López | 2.481 | 1973 | |
| 32 | Jason O'Herlihy | 2.483 | 1979 | |
| 33 | Robert Ray | 2.489 | 1974 | |
| 34 | Lance Stanford# | 2.507 | 2016 | |
| 35 | Juan Ortega | 2.509 | 1972 | |
| 36 | Pepe Lugo | 2.518 | 2011 | |
| 37 | Pedro Salas | 2.519 | 1972 | |
| 38 | Aaron Wright | 2.522 | 1975 | |
| 39 | Nelson Rodríguez | 2.538 | 1979 | |
| 40 | Okura Agano | 2.556 | 1973 | |
| 41 | Torquato Campelina | 2.559 | 1973 | |
| 42 | Leonard Day | 2.564 | 1971 | |
| 42 | Adrian Epps | 2.564 | 2015 | |
| 44 | Larry Nix | 2.569 | 1970 | |
| 45 | David Worley | 2.577 | 1971 | |
| 46 | Tony Green | 2.579 | 1976 | |
| 47 | Tom Mitchell | 2.584 | 1975 | |
| 48 | Floyd Dean | 2.591 | 1973 | |
| 49 | David Worley | 2.594 | 1972 | |
| 50 | Gustavo Vallejo# | 2.608 | 2018 | |
| 51 | Dave Hall | 2.612 | 1980 | |
| 52 | David Knight | 2.617 | 1970 | |
| 53 | Luis Villarreal | 2.619 | 2002 | |
| 54 | Sandor Derksen | 2.630 | 2002 | |
| 55 | Miguel Tirado | 2.631 | 1970 | |
| 56 | Jeffery Nelson | 2.634 | 1974 | |
| 57 | Jimmy Nickerson | 2.643 | 2010 | |
| 58 | Marvin Billings | 2.649 | 1975 | |
| 59 | Willie Green | 2.663 | 2007 | |
| 60 | Iván Ramírez | 2.672 | 1972 | |
| 61 | Carlos Velásquez | 2.679 | 1971 | |
| 62 | Ramón Pérez | 2.687 | 1975 | |
| 63 | Robert Philip | 2.696 | 1971 | |
| 64 | José García | 2.712 | 1970 | |
| 65 | Joe Francis | 2.714 | 1974 | |
| 66 | Ray Walker | 2.724 | 2001 | |
| 67 | Lee Hartley | 2.735 | 1975 | |
| 68 | Nathan Butler | 2.737 | 2001 | |
| 69 | Mike Funk | 2.745 | 1977 | |
| 70 | Desmond MacGilp* | 2.752 | 1983 | |
| 71 | Jesús Córdova | 2.754 | 1973 | |
| 72 | Don Rogers | 2.766 | 2014 | |
| 73 | Joe Bowman | 2.771 | 1978 | |
| 74 | Luis Carrillo | 2.773 | 1976 | |
| 74 | Paul Morgan | 2.773 | 1994 | |
| 76 | Vic MacGregor | 2.776 | 1975 | |
| 77 | Michael Bowden* | 2.777 | 1979 | |
| 78 | Anthony Tolbert | 2.781 | 1994 | |
| 79 | Neal Turner | 2.782 | 2009 | |
| 80 | Kurt Hickman | 2.788 | 1971 | |
| 81 | Chase Miller | 2.793 | 1995 | |
| 82 | Rich Jones | 2.799 | 1979 | |
| 83 | Salvador Gómez | 2.800 | 1979 | |
| 84 | Ramón Pérez | 2.802 | 1974 | |
| 85 | Martín Deleón | 2.806 | 1973 | |
| 86 | John Morrison | 2.810 | 1976 | |
| 87 | Bartolo Cortéz | 2.811 | 1974 | |
| 88 | Roberto Rojas | 2.813 | 1973 | |
| 89 | John Merriam | 2.814 | 1971 | |
| 89 | Eric Pate | 2.814 | 2020 | |
| 89 | Miguel Vela | 2.814 | 1980 | |
| 92 | Nick Bannatyne | 2.817 | 2001 | |
| 93 | Roy Sims# | 2.827 | 2020 | |
| 93 | Doyle Thomas | 2.827 | 1980 | |
| 95 | Max Hendricks | 2.831 | 2011 | |
| 95 | Bill Fitzpatrick | 2.831 | 1990 | |
| 95 | Brad Robertson | 2.831 | 1975 | |
| 98 | José Villegas | 2.837 | 2000 | |
| 99 | Joseph Long | 2.840 | 1978 | |
| 100 | Doug Smith | 2.842 | 2001 |
