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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Alejandro Amaya | 2.714 | 2034-2042 | |
| 2 | Jody Sutherland | 2.805 | 2032-2041 | |
| 3 | Luis Cruz | 2.923 | 2035-2043 | |
| 4 | Eric Mills | 2.943 | 2033-2044 | |
| 5 | Bill Hawkins | 3.040 | 2026-2034 | |
| 6 | Stanley Hart | 3.061 | 2028-2041 | |
| 7 | Silas Ryan | 3.134 | 2027-2037 | |
| 8 | Rodney Nilsson | 3.201 | 2029-2036 | |
| 9 | Finn Veenman | 3.222 | 2029-2040 | |
| 10 | Pat Latham | 3.245 | 2036-2048 | |
| 11 | Jonathan Westhoff | 3.284 | 2024-2031 | |
| 12 | Francisco Méndez | 3.299 | 2034-2046 | |
| 13 | Ken Brown | 3.302 | 2051-2059 | |
| 14 | Mark Pearson | 3.327 | 2024-2031 | |
| 15 | Pedro Torres | 3.352 | 2029-2039 | |
| 16 | Joong Lou# | 3.364 | 2054-2064 | |
| 17 | Rusty Eager | 3.388 | 2028-2039 | |
| 18 | Lúcio Saldaña | 3.392 | 2033-2045 | |
| 19 | Ron Hill | 3.402 | 2031-2043 | |
| 20 | Art Stevens | 3.404 | 2054-2061 | |
| 21 | Adelardo Torres | 3.417 | 2024-2037 | |
| 21 | Armando Chávez | 3.417 | 2029-2044 | |
| 23 | Jean Gayle | 3.425 | 2025-2033 | |
| 24 | Ray Ratzlaff | 3.432 | 2033-2043 | |
| 25 | Roberto González | 3.450 | 2032-2043 | |
| 26 | António Mata | 3.489 | 2033-2043 | |
| 27 | Erich Severt | 3.492 | 2024-2032 | |
| 28 | Michael Cray | 3.493 | 2024-2030 | |
| 29 | Howard Gallegos | 3.517 | 2046-2059 | |
| 30 | Ray Newton | 3.529 | 2031-2042 | |
| 31 | Gustavo Aguilar | 3.532 | 2030-2042 | |
| 32 | Mathew McKinley | 3.534 | 2041-2055 | |
| 33 | Reid Guillotte | 3.541 | 2025-2031 | |
| 34 | Benjamin Rivera | 3.561 | 2024-2034 | |
| 35 | Terry Williams | 3.563 | 2024-2031 | |
| 36 | Miguel Encarnación | 3.568 | 2035-2044 | |
| 36 | Don Tai | 3.568 | 2024-2033 | |
| 38 | Gavin Austin | 3.586 | 2024-2031 | |
| 38 | Roger Espinal | 3.586 | 2024-2039 | |
| 40 | Joe Hutchinson | 3.618 | 2026-2033 | |
| 41 | Cheng-ji Zou | 3.621 | 2034-2043 | |
| 42 | Matt Melton | 3.628 | 2041-2049 | |
| 43 | Pancho Cortéz | 3.632 | 2044-2055 | |
| 44 | Mike Harrington | 3.645 | 2027-2036 | |
| 45 | Kevin Rix | 3.648 | 2024-2038 | |
| 46 | Ángel Martínez | 3.653 | 2038-2046 | |
| 47 | James Loeffler | 3.654 | 2024-2035 | |
| 48 | Astolfo Roeffingh | 3.662 | 2029-2035 | |
| 49 | Rubén Oliva | 3.673 | 2033-2044 | |
| 50 | Andy Campbell | 3.688 | 2049-2062 | |
| 51 | Sean Cardoza | 3.690 | 2024-2037 | |
| 52 | Darrin Cuthbert | 3.693 | 2024-2041 | |
| 53 | José Luna# | 3.701 | 2051-2064 | |
| 54 | Arturo Dávila | 3.709 | 2028-2043 | |
| 55 | Wilfredo Nuñez | 3.720 | 2027-2035 | |
| 56 | Dave Crawford | 3.728 | 2050-2061 | |
| 57 | Dewitt Jones | 3.731 | 2051-2058 | |
| 58 | Stanley Miller | 3.739 | 2024-2031 | |
| 59 | David Croyle | 3.744 | 2024-2034 | |
| 59 | Gonzalo González | 3.744 | 2034-2047 | |
| 61 | Wesuri Shunji | 3.746 | 2025-2033 | |
| 62 | Roy Warren | 3.771 | 2033-2046 | |
| 63 | Manuel Cháves | 3.777 | 2033-2044 | |
| 64 | Anibal Mealha | 3.778 | 2031-2044 | |
| 65 | Chris Johnston | 3.789 | 2047-2055 | |
| 66 | Rod Derrickson | 3.793 | 2034-2039 | |
| 67 | Roosevelt McWhirter | 3.795 | 2026-2035 | |
| 68 | Alberto Serrano | 3.806 | 2024-2032 | |
| 69 | Valentín Ramírez# | 3.812 | 2049-2064 | |
| 70 | Diego Romo# | 3.814 | 2055-2061 | |
| 71 | Ramón Santos | 3.816 | 2040-2049 | |
| 72 | Terry Abrams | 3.821 | 2027-2039 | |
| 73 | Grant Hamilton | 3.825 | 2051-2063 | |
| 73 | Gaspar Ramirez | 3.825 | 2024-2032 | |
| 75 | Edgar Abreu# | 3.827 | 2056-2064 | |
| 76 | Fernando Hernández | 3.851 | 2040-2054 | |
| 77 | Dave Coker | 3.856 | 2029-2037 | |
| 77 | Yi-mou Jen | 3.856 | 2048-2057 | |
| 79 | Vincent Caetani | 3.895 | 2030-2037 | |
| 80 | Wilfredo Castro | 3.897 | 2024-2034 | |
| 81 | Dave Waters | 3.900 | 2043-2057 | |
| 82 | Luis Cabrera | 3.918 | 2040-2052 | |
| 83 | Javier Hernández | 3.927 | 2036-2045 | |
| 83 | Roberto Deleón | 3.927 | 2048-2057 | |
| 85 | Mario Pagán | 3.930 | 2029-2040 | |
| 86 | José Maes | 3.941 | 2040-2052 | |
| 87 | Jacques Simon | 3.942 | 2042-2055 | |
| 88 | Mario López | 3.957 | 2046-2055 | |
| 89 | Elmer Sanders | 3.996 | 2048-2054 | |
| 90 | Lorenzo Morales | 4.005 | 2032-2039 | |
| 91 | Boris Moffett | 4.010 | 2026-2035 | |
| 92 | Chester Wright | 4.013 | 2046-2054 | |
| 93 | Raul Balbas | 4.026 | 2024-2029 | |
| 94 | David Jacobson | 4.029 | 2046-2056 | |
| 95 | Mark Webb | 4.052 | 2044-2052 | |
| 96 | Tom Jones | 4.054 | 2035-2048 | |
| 97 | Mike Hatfield | 4.059 | 2054-2063 | |
| 98 | Darryl Smith | 4.078 | 2047-2057 | |
| 99 | Jorge Pérez | 4.080 | 2045-2054 | |
| 100 | Joe Hall | 4.123 | 2047-2058 |
