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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Juan Aguilar# | 0.692 | 2111 | |
| 2 | Júlio Bueno# | 0.862 | 2110 | |
| 3 | Kevin Gonzáles# | 0.871 | 2120 | |
| 4 | Terry Walls# | 0.878 | 2119 | |
| 5 | Richard Schmidt# | 0.880 | 2113 | |
| 6 | Keith Rucker# | 0.908 | 2110 | |
| 7 | Marcos Uribe# | 1.059 | 2112 | |
| 8 | John Nicholls# | 1.080 | 2117 | |
| 9 | Stan Jefferson# | 1.089 | 2119 | |
| 10 | Michael O'Rourke# | 1.137 | 2115 | |
| 11 | Ramón Flores# | 1.200 | 2118 | |
| 12 | Joe López# | 1.317 | 2120 | |
| 13 | Steve Lange# | 1.421 | 2119 | |
| 14 | Mark LaBelle# | 1.432 | 2112 | |
| 15 | Andrew Meyer# | 1.484 | 2113 | |
| 16 | Alfredo Gómez# | 1.500 | 2120 | |
| 17 | Mike Cantrell# | 1.588 | 2112 | |
| 18 | Aaron Bell# | 1.643 | 2120 | |
| 19 | Jason Stafford# | 1.658 | 2110 | |
| 20 | Preston Garner# | 1.670 | 2111 | |
| 21 | Valentín Estrada# | 1.673 | 2111 | |
| 22 | Gilbert Erickson# | 1.718 | 2119 | |
| 23 | Marcos Álvarez# | 1.723 | 2111 | |
| 24 | Billy Eldridge# | 1.742 | 2116 | |
| 25 | John Jones# | 1.761 | 2119 | |
| 26 | John Evans# | 1.800 | 2112 | |
| 27 | Erik Beasley# | 1.909 | 2113 | |
| 28 | Eric Thibault# | 1.929 | 2120 | |
| 28 | Dan Drake# | 1.929 | 2118 | |
| 30 | Chris Orr# | 1.946 | 2110 | |
| 30 | Steve Brooks# | 1.946 | 2119 | |
| 32 | Vincent Rogers# | 1.948 | 2118 | |
| 33 | Theodore Russell# | 1.954 | 2120 | |
| 34 | Gerald Guerrero# | 1.982 | 2112 | |
| 35 | Greg Johnson# | 2.019 | 2120 | |
| 36 | Mark Foster# | 2.025 | 2120 | |
| 37 | Raúl Hinojosa# | 2.038 | 2111 | |
| 38 | Cory Valentín# | 2.048 | 2112 | |
| 39 | Bob Greene# | 2.077 | 2116 | |
| 40 | Mario García# | 2.097 | 2120 | |
| 41 | Joe Gusmán# | 2.139 | 2116 | |
| 42 | Louis Thomas# | 2.231 | 2116 | |
| 43 | John Coker# | 2.250 | 2113 | |
| 44 | Juan Garza# | 2.271 | 2120 | |
| 44 | Juan Rocha# | 2.271 | 2112 | |
| 46 | Andrés Rodríguez# | 2.314 | 2119 | |
| 47 | Vernon Leivers# | 2.320 | 2119 | |
| 48 | Steve Casey# | 2.359 | 2116 | |
| 49 | Kenny Baldwin# | 2.374 | 2111 | |
| 50 | Oliver Esquero# | 2.400 | 2113 | |
| 51 | Thomas Hernández# | 2.406 | 2120 | |
| 51 | John Callender# | 2.406 | 2120 | |
| 53 | Félix Galván# | 2.455 | 2120 | |
| 53 | Edgardo Reyes# | 2.455 | 2115 | |
| 55 | Bob Dukeshire# | 2.480 | 2120 | |
| 56 | Joseph Rice# | 2.558 | 2119 | |
| 57 | John Coker# | 2.581 | 2112 | |
| 58 | Millard Krause# | 2.596 | 2119 | |
| 59 | Sergio Alvarado# | 2.613 | 2113 | |
| 60 | George Hornaday# | 2.659 | 2111 | |
| 61 | Mike Garbutt# | 2.670 | 2116 | |
| 62 | Júlio Taváres# | 2.725 | 2119 | |
| 63 | Ben Sullivan# | 2.727 | 2115 | |
| 64 | Jorge Magana# | 2.784 | 2120 | |
| 65 | Bryan Benson# | 2.793 | 2118 | |
| 66 | José Ramírez# | 2.829 | 2120 | |
| 67 | Harry Juneau# | 2.842 | 2112 | |
| 68 | Paul Turner# | 2.856 | 2119 | |
| 69 | Jake Nelson# | 2.883 | 2112 | |
| 70 | Brandon Davis# | 2.903 | 2118 | |
| 71 | Josh Matthews# | 2.935 | 2112 | |
| 71 | José Mendoza# | 2.935 | 2114 | |
| 71 | Abel O'Day# | 2.935 | 2118 | |
| 74 | Armando Valdéz# | 2.941 | 2118 | |
| 74 | J.J. Allen# | 2.941 | 2117 | |
| 76 | Wang Jong# | 2.945 | 2111 | |
| 77 | Larry Gross# | 2.967 | 2115 | |
| 77 | Oscar Colón# | 2.967 | 2117 | |
| 79 | Rob Wolfe# | 2.970 | 2116 | |
| 79 | Steve Washington# | 2.970 | 2112 | |
| 81 | Ryan Hogan# | 2.972 | 2114 | |
| 82 | Dave Benton# | 2.975 | 2119 | |
| 83 | Domingo Ruíz# | 3.000 | 2119 | |
| 83 | Philip Cahill# | 3.000 | 2117 | |
| 85 | Howard Spencer# | 3.028 | 2110 | |
| 86 | Bill Belanger# | 3.031 | 2112 | |
| 87 | Chris Hamilton# | 3.115 | 2114 | |
| 88 | Kevin Crawford# | 3.160 | 2118 | |
| 89 | Rick Barnes# | 3.194 | 2115 | |
| 90 | Wade Anderson# | 3.208 | 2120 | |
| 91 | John Harper# | 3.220 | 2116 | |
| 92 | Bill Schultz# | 3.228 | 2115 | |
| 92 | Bruce Jordan# | 3.228 | 2116 | |
| 94 | Ronald Allen# | 3.240 | 2113 | |
| 95 | Iván Rodríguez# | 3.264 | 2112 | |
| 95 | Reynaldo López# | 3.264 | 2118 | |
| 97 | Troy Robinson# | 3.280 | 2118 | |
| 98 | Jack Thurman# | 3.300 | 2113 | |
| 98 | Carlos Díaz# | 3.300 | 2111 | |
| 98 | Manuel Zamora# | 3.300 | 2118 |
