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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Dennis Montgomery | 3.779 | 2030-2042 | |
| 2 | Ken Stein | 3.828 | 2034-2045 | |
| 3 | Danny Zomosa | 3.940 | 2035-2044 | |
| 4 | Douggie Pitchford | 4.001 | 2030-2042 | |
| 5 | Pedro Aragon | 4.019 | 2048-2055 | |
| 6 | Luis Rodríguez | 4.104 | 2033-2043 | |
| 7 | Dongdo-pa Chen | 4.118 | 2025-2039 | |
| 8 | Michael Smith | 4.155 | 2027-2037 | |
| 9 | Scott Gorman | 4.169 | 2012-2022 | |
| 10 | David Myers | 4.170 | 2029-2039 | |
| 11 | Robby Martin# | 4.198 | 2048-2055 | |
| 12 | Robert Hood | 4.228 | 2015-2023 | |
| 13 | Jeffery Francis | 4.252 | 2016-2027 | |
| 14 | Masamichi Takeda | 4.270 | 2031-2040 | |
| 15 | Bappaka Ramanakoppa | 4.288 | 2022-2038 | |
| 16 | Devayukta Tushar | 4.291 | 2023-2032 | |
| 17 | Ashley Heath | 4.303 | 2028-2040 | |
| 18 | Marcus Seraphin# | 4.315 | 2048-2056 | |
| 19 | Jeremy Lamfers# | 4.318 | 2047-2057 | |
| 20 | Joey Cabler | 4.323 | 2043-2050 | |
| 21 | Yeong-suk Kim | 4.324 | 2021-2034 | |
| 22 | Mike Brown | 4.327 | 2046-2056 | |
| 23 | Alex Munoz | 4.356 | 2034-2044 | |
| 24 | Andres Alvarez# | 4.365 | 2043-2057 | |
| 25 | Jacob Willard | 4.380 | 2024-2038 | |
| 26 | Jun Nakayama | 4.387 | 2026-2041 | |
| 27 | Nelson Hill | 4.403 | 2014-2025 | |
| 28 | Joe Gillard | 4.437 | 2031-2038 | |
| 29 | Omar Salazar# | 4.452 | 2047-2057 | |
| 30 | Joe McLernon | 4.483 | 2016-2022 | |
| 31 | Po-sin Pang | 4.500 | 2029-2040 | |
| 32 | Michael Moyer | 4.508 | 2022-2037 | |
| 33 | Joe Kenner | 4.519 | 2019-2033 | |
| 34 | Josh Bradshaw | 4.521 | 2039-2049 | |
| 35 | John Martin | 4.554 | 2012-2021 | |
| 36 | Jim Ashford# | 4.584 | 2049-2057 | |
| 37 | Chris Baxter | 4.589 | 2019-2026 | |
| 38 | Juan Centeno | 4.600 | 2038-2047 | |
| 39 | Juan Fernandez# | 4.601 | 2046-2057 | |
| 40 | Alain Picard | 4.607 | 2030-2042 | |
| 41 | Yoshiyuki Matsuda | 4.609 | 2038-2045 | |
| 42 | Gene Legrow | 4.612 | 2043-2052 | |
| 43 | Ron Harris | 4.615 | 2035-2045 | |
| 44 | Eddie Beltran | 4.622 | 2042-2054 | |
| 45 | Joel Hyle# | 4.648 | 2052-2057 | |
| 46 | Héctor Bello | 4.656 | 2034-2044 | |
| 47 | Andrew Johnson | 4.674 | 2028-2037 | |
| 48 | Daniel Wilson | 4.682 | 2023-2033 | |
| 49 | Colby Virella | 4.683 | 2034-2045 | |
| 50 | Pat Toope# | 4.690 | 2051-2057 | |
| 50 | Edgar Alvarez | 4.690 | 2036-2047 | |
| 52 | Ken Stevens | 4.703 | 2047-2055 | |
| 53 | Dan Ayers | 4.710 | 2043-2050 | |
| 54 | James Hodges# | 4.742 | 2050-2056 | |
| 55 | Bernardo Lara | 4.761 | 2016-2029 | |
| 56 | Bob Campos | 4.769 | 2035-2047 | |
| 57 | Aaron Dilnot | 4.782 | 2023-2030 | |
| 58 | Miguel Rodríguez | 4.798 | 2034-2045 | |
| 59 | Rick Childress | 4.810 | 2026-2034 | |
| 60 | Ernesto Sanchez# | 4.812 | 2047-2057 | |
| 61 | John Huo | 4.819 | 2033-2042 | |
| 62 | Chris Costello | 4.827 | 2037-2045 | |
| 63 | Jeff Bushman | 4.838 | 2040-2049 | |
| 64 | Ronald Lee | 4.866 | 2025-2035 | |
| 65 | Kagehisa Saikawa | 4.868 | 2022-2035 | |
| 66 | Leonard Lee | 4.908 | 2026-2034 | |
| 67 | Chris Sanchez | 4.929 | 2035-2047 | |
| 68 | Chuk-yan Bi | 4.937 | 2022-2033 | |
| 69 | Jason Shaw# | 4.944 | 2048-2056 | |
| 70 | Felix Martinez | 4.959 | 2042-2050 | |
| 71 | Takeshi Gato | 4.965 | 2027-2042 | |
| 72 | Dave Francisco | 4.975 | 2037-2044 | |
| 73 | Eric Walker | 5.007 | 2012-2021 | |
| 74 | Ichiji Seaton# | 5.013 | 2048-2057 | |
| 75 | Goro Ota | 5.015 | 2029-2039 | |
| 76 | Jon Morris | 5.028 | 2019-2028 | |
| 77 | Peter Barrett | 5.037 | 2012-2021 | |
| 78 | Edgardo Félix | 5.038 | 2015-2029 | |
| 79 | Anthony McIntyre | 5.061 | 2022-2034 | |
| 80 | Wayne Penfield | 5.116 | 2020-2029 | |
| 81 | Chris Pelton | 5.135 | 2031-2041 | |
| 82 | Gary Compton | 5.169 | 2037-2043 | |
| 83 | Ron Ogden | 5.206 | 2032-2042 | |
| 84 | Teagan Cooper | 5.211 | 2038-2047 | |
| 85 | Kazuhiro Kouno | 5.218 | 2020-2027 | |
| 86 | John Curnew | 5.227 | 2028-2040 | |
| 87 | Juan Ortiz | 5.234 | 2035-2047 | |
| 88 | Trey Robinson | 5.263 | 2024-2035 | |
| 89 | Gerardo Estrada | 5.268 | 2023-2034 | |
| 90 | Robert Cook | 5.285 | 2021-2036 | |
| 91 | Adam Workman | 5.288 | 2039-2050 | |
| 92 | Tommy Bartlett | 5.300 | 2021-2029 | |
| 93 | Alberto Rivera | 5.339 | 2022-2035 | |
| 94 | Carlos León | 5.351 | 2022-2033 | |
| 94 | Steve Johnston | 5.351 | 2016-2023 | |
| 96 | Tim Oliver | 5.386 | 2037-2046 | |
| 97 | Esteban Martínez | 5.397 | 2017-2029 | |
| 98 | Odoardo Bairros | 5.475 | 2015-2027 | |
| 99 | Kyoji Mizutani | 5.483 | 2023-2032 | |
| 100 | Pedro Cerna | 5.556 | 2033-2048 |
