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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | José Leal | 1.449 | 2013 | |
| 2 | Jeremy Fisher | 1.481 | 2013 | |
| 3 | Pedro Rosário | 1.700 | 2016 | |
| 4 | Pablo Cuevas | 1.776 | 2014 | |
| 5 | Pedro Díaz | 1.827 | 2017 | |
| 6 | Ted Mills | 1.960 | 2012 | |
| 7 | Héctor González# | 1.985 | 2029 | |
| 8 | Jeremy Fisher | 2.016 | 2012 | |
| 9 | Kirk Snyder | 2.046 | 2013 | |
| 10 | Daryl Walder# | 2.049 | 2029 | |
| 11 | José Barrachina# | 2.073 | 2030 | |
| 12 | Kazuyoshi Tada | 2.118 | 2026 | |
| 13 | Hideki Ohayashi | 2.160 | 2016 | |
| 14 | Kevin Murphy# | 2.174 | 2029 | |
| 15 | Diogo Negreiros | 2.181 | 2014 | |
| 16 | Guillermo Herrera | 2.265 | 2013 | |
| 17 | Evan Taylor | 2.280 | 2016 | |
| 18 | Mike Carter | 2.297 | 2013 | |
| 19 | Matsuyo Koda# | 2.317 | 2029 | |
| 20 | Takehide Sato# | 2.322 | 2030 | |
| 21 | Andy Green | 2.331 | 2013 | |
| 22 | Garth Daniels# | 2.339 | 2025 | |
| 23 | Tamasaburo Kato | 2.344 | 2029 | |
| 23 | Filipe Castanheta | 2.344 | 2026 | |
| 25 | Anthony Atkinson | 2.394 | 2012 | |
| 26 | Tadaaki Tahara | 2.396 | 2013 | |
| 27 | Elmer Turner# | 2.405 | 2026 | |
| 28 | Brent Welch | 2.447 | 2013 | |
| 29 | Qing-lai Juan# | 2.459 | 2029 | |
| 30 | Ryan Jenkins | 2.471 | 2017 | |
| 31 | Joe McLernon | 2.480 | 2014 | |
| 32 | Daryl Walder# | 2.504 | 2028 | |
| 33 | Vaughan Ambrose | 2.517 | 2013 | |
| 34 | Luis Bermúdez | 2.525 | 2015 | |
| 35 | Ijaz Kharoti# | 2.534 | 2025 | |
| 36 | Oscar Mata# | 2.538 | 2033 | |
| 37 | Bob Goudie | 2.551 | 2014 | |
| 38 | Guglielmo Tomei# | 2.554 | 2032 | |
| 39 | Subaru Suzuki# | 2.556 | 2028 | |
| 40 | Pat McConnell# | 2.559 | 2026 | |
| 41 | Grant Huffman# | 2.577 | 2032 | |
| 42 | Mike Harper | 2.599 | 2016 | |
| 43 | Yoritomo Suitani | 2.641 | 2024 | |
| 44 | Esteban Martínez | 2.646 | 2016 | |
| 45 | Kunio Otsuka# | 2.650 | 2033 | |
| 46 | Ánibal Altichioro# | 2.653 | 2026 | |
| 47 | Juan Pérez# | 2.656 | 2030 | |
| 48 | Adrien Clément | 2.663 | 2013 | |
| 49 | Ronaldo Teves# | 2.664 | 2026 | |
| 50 | Bob Galloway# | 2.667 | 2032 | |
| 50 | Mike Chapman | 2.667 | 2018 | |
| 52 | Felipe Rodríguez# | 2.670 | 2025 | |
| 53 | Leonardo Reynoso | 2.675 | 2012 | |
| 54 | Eisuke Ota | 2.695 | 2025 | |
| 55 | Vadim Pejemsky | 2.696 | 2014 | |
| 55 | Joe McLernon | 2.696 | 2013 | |
| 57 | Sam Young# | 2.700 | 2034 | |
| 57 | Douggie Pitchford# | 2.700 | 2028 | |
| 59 | Bob Goudie | 2.705 | 2013 | |
| 60 | Mushanokoji Uchida | 2.715 | 2013 | |
| 61 | Lewis Hunter | 2.735 | 2018 | |
| 62 | Alfredo Crespo# | 2.738 | 2025 | |
| 63 | Ricardo Castros# | 2.744 | 2025 | |
| 64 | Qi-chen Dong | 2.747 | 2023 | |
| 65 | Billy Green | 2.752 | 2016 | |
| 66 | Steve Becker# | 2.753 | 2030 | |
| 66 | Ichiro Hashimoto# | 2.753 | 2027 | |
| 68 | Timothy Hill | 2.769 | 2025 | |
| 69 | Daniel Bonnin | 2.773 | 2018 | |
| 69 | Juan García | 2.773 | 2025 | |
| 71 | Sandy Carey | 2.810 | 2016 | |
| 72 | Juliano Castellanos | 2.823 | 2024 | |
| 73 | Jeff Lundberg | 2.825 | 2017 | |
| 74 | Patrick Charbonnier# | 2.832 | 2030 | |
| 75 | Reynaldo Martínez | 2.840 | 2014 | |
| 76 | Joey McCalvin# | 2.847 | 2033 | |
| 77 | Pablo Costa | 2.849 | 2012 | |
| 78 | Kenny Winston | 2.864 | 2016 | |
| 79 | Raúl Coronado | 2.881 | 2029 | |
| 80 | Scott Brown | 2.887 | 2017 | |
| 81 | Joshua Goldberg | 2.898 | 2013 | |
| 81 | Barry Sherman# | 2.898 | 2028 | |
| 83 | Norberto Rocha | 2.903 | 2013 | |
| 84 | Carlos Moreno | 2.911 | 2026 | |
| 85 | Michael Walsh# | 2.916 | 2023 | |
| 86 | Chris Terry | 2.923 | 2016 | |
| 87 | Manuel Cortéz# | 2.927 | 2029 | |
| 88 | Min Qi | 2.936 | 2027 | |
| 89 | Cutter John | 2.941 | 2012 | |
| 90 | Pedro Sánchez | 2.944 | 2029 | |
| 91 | Iemitsu Shiroi# | 2.952 | 2031 | |
| 92 | Michael Walsh# | 2.953 | 2024 | |
| 93 | Jaime González | 2.963 | 2015 | |
| 94 | Cristoforo Giugino# | 2.964 | 2020 | |
| 95 | Garth Bankston# | 2.965 | 2034 | |
| 96 | Iván Santos | 2.966 | 2016 | |
| 97 | Aaron Jewell | 2.969 | 2015 | |
| 97 | Kichibei Endo# | 2.969 | 2028 | |
| 99 | Enrique López | 2.979 | 2020 | |
| 100 | Toyotomi Nakano# | 2.986 | 2013 |
