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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Don Barnes | 2.559 | 2017-2031 | |
| 2 | Roberto Rodríguez# | 2.690 | 2029-2037 | |
| 3 | Ralph Morris | 2.771 | 2027-2033 | |
| 4 | Pedro Marquis | 2.798 | 2028-2037 | |
| 5 | Masamichi Kono | 2.842 | 2026-2035 | |
| 6 | Kyung-suk Kim# | 2.868 | 2027-2037 | |
| 7 | Felipe Morán | 2.874 | 2026-2032 | |
| 8 | Shang-de Li# | 2.882 | 2032-2040 | |
| 9 | Ed Madison | 2.888 | 2019-2030 | |
| 10 | Seong-chae Somun# | 2.896 | 2030-2036 | |
| 11 | Eric Madelen | 2.898 | 2017-2026 | |
| 12 | Rob Patel# | 2.917 | 2030-2040 | |
| 13 | Victor McKay | 2.923 | 2022-2038 | |
| 14 | Juan Jose Patino | 2.954 | 2025-2038 | |
| 15 | Ju-wei Zong# | 2.976 | 2026-2040 | |
| 16 | Ryozo Kono | 2.990 | 2030-2037 | |
| 17 | Masaru Kouki | 3.013 | 2024-2038 | |
| 18 | Lateef Kamomba | 3.040 | 2025-2035 | |
| 19 | António Vega | 3.051 | 2022-2034 | |
| 20 | William Pollock | 3.069 | 2019-2036 | |
| 21 | Fred Sorley | 3.098 | 2028-2037 | |
| 22 | Katsumoto Ikeda | 3.123 | 2023-2036 | |
| 23 | Yoichibei Suzuki | 3.140 | 2025-2035 | |
| 24 | Hayato Kawano | 3.154 | 2024-2038 | |
| 25 | Silvio Bolt | 3.160 | 2029-2039 | |
| 26 | Cheng-en Hsieh | 3.162 | 2026-2037 | |
| 27 | Jack Mundy | 3.163 | 2026-2037 | |
| 28 | Ralph Coolen# | 3.178 | 2028-2040 | |
| 29 | Robinson Herrera | 3.200 | 2021-2028 | |
| 30 | Kazuyuki Kumagai | 3.208 | 2024-2033 | |
| 31 | Naozane Sakai# | 3.228 | 2026-2040 | |
| 32 | Sandy Garza | 3.235 | 2028-2036 | |
| 33 | Yin-zhen Kan | 3.247 | 2021-2036 | |
| 34 | Bob Riddle | 3.252 | 2027-2035 | |
| 35 | Thomas Cole | 3.263 | 2023-2030 | |
| 36 | Matt Allison | 3.277 | 2021-2033 | |
| 37 | Barney Stevens | 3.306 | 2030-2038 | |
| 38 | Xiao-peng Li | 3.307 | 2011-2026 | |
| 39 | Joaquín Valenzuela | 3.308 | 2010-2017 | |
| 40 | Izumo Kondo | 3.323 | 2026-2037 | |
| 41 | Germán Durango# | 3.353 | 2027-2040 | |
| 42 | James Jordan | 3.384 | 2020-2028 | |
| 43 | Yoshitora Koyama | 3.386 | 2007-2021 | |
| 44 | Kosami Suzuki# | 3.396 | 2030-2040 | |
| 44 | Luis Monsalve | 3.396 | 2021-2031 | |
| 46 | Gennaro Averlino# | 3.444 | 2031-2036 | |
| 47 | Steve Hott | 3.475 | 2022-2031 | |
| 48 | Matthew Chandler | 3.494 | 2007-2013 | |
| 49 | Ricardo García | 3.521 | 2020-2033 | |
| 50 | Vance Duncan# | 3.526 | 2027-2040 | |
| 51 | Justin Bracey | 3.569 | 2018-2031 | |
| 52 | Manuel Barrios# | 3.597 | 2023-2038 | |
| 53 | Ángelo Gil | 3.598 | 2024-2031 | |
| 54 | William Ferguson | 3.599 | 2014-2026 | |
| 55 | Gustavo Cabrera | 3.624 | 2022-2032 | |
| 56 | Rob Lambert | 3.638 | 2007-2016 | |
| 57 | David Barton | 3.640 | 2016-2024 | |
| 57 | Gerald Francis | 3.640 | 2008-2019 | |
| 57 | Kevin Gallegos | 3.640 | 2029-2039 | |
| 60 | Tim McGowan | 3.649 | 2010-2016 | |
| 61 | R.J. Racine | 3.654 | 2025-2033 | |
| 62 | Danny Burgess | 3.661 | 2020-2027 | |
| 63 | Mike Lovell | 3.681 | 2014-2024 | |
| 64 | Billy Taylor | 3.686 | 2023-2031 | |
| 65 | Jason White | 3.758 | 2007-2013 | |
| 66 | César Hernández | 3.806 | 2017-2022 | |
| 67 | Phil Anderson | 3.818 | 2014-2026 | |
| 68 | Júlio Rivera# | 3.828 | 2030-2039 | |
| 69 | Donald Edwards | 3.843 | 2017-2026 | |
| 70 | Cody Park | 3.882 | 2018-2025 | |
| 71 | Júlio López | 3.913 | 2011-2017 | |
| 72 | Truman Burke | 3.929 | 2019-2028 | |
| 73 | León Rivera | 3.967 | 2007-2019 | |
| 74 | Bernie Jacoby | 3.989 | 2011-2020 | |
| 75 | Steve Major | 3.994 | 2019-2027 | |
| 76 | Juan Ordóñez | 4.029 | 2007-2015 | |
| 77 | Masami Minami | 4.065 | 2021-2027 | |
| 78 | Tzu-yu Siu | 4.070 | 2015-2021 | |
| 79 | Jorge Ortíz | 4.084 | 2007-2011 | |
| 80 | Chris Patterson | 4.097 | 2013-2020 | |
| 81 | José Aranda | 4.112 | 2010-2021 | |
| 82 | Vincent Watson | 4.151 | 2007-2016 | |
| 83 | Anastasio Hernández | 4.168 | 2015-2028 | |
| 84 | José Martínez | 4.200 | 2016-2022 | |
| 85 | Matt Howard | 4.240 | 2011-2019 | |
| 86 | Kenny Bender | 4.243 | 2012-2024 | |
| 87 | Brian Ryan | 4.265 | 2011-2018 | |
| 88 | José Márquez | 4.303 | 2012-2019 | |
| 89 | Javier Pacheco | 4.335 | 2011-2016 | |
| 90 | David Sánchez | 4.404 | 2021-2028 | |
| 91 | En-guo Zhào | 4.425 | 2016-2022 | |
| 92 | Pedro Salas | 4.464 | 2012-2024 | |
| 93 | Nathan Barton | 4.469 | 2007-2015 | |
| 94 | Cipriano Baca | 4.821 | 2011-2017 |
