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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Dick Barrett | 3.142 | 1941-1950 | |
| 2 | Frank Barnes | 3.217 | 1951-1965 | |
| 3 | Roger Bowman | 3.344 | 1951-1961 | |
| 4 | Buzz Arlett | 3.389 | 1918-1930 | |
| 5 | Gene Bearden | 3.395 | 1946-1957 | |
| 6 | Bob Alexander | 3.418 | 1954-1958 | |
| 7 | Jeff Bittiger | 3.439 | 1986-1995 | |
| 8 | Red Adams | 3.472 | 1942-1958 | |
| 9 | Bill Bradford | 3.581 | 1950-1956 | |
| 10 | Rugger Ardizoia | 3.646 | 1941-1950 | |
| 11 | Johnny Page# | 3.706 | 2030-2036 | |
| 12 | Jerry Wright# | 3.747 | 2031-2036 | |
| 13 | George Bamberger | 3.782 | 1950-1963 | |
| 14 | Charlie Beamon | 3.797 | 1954-1960 | |
| 15 | Dennis Bennett | 3.915 | 1968-1973 | |
| 16 | Fernando Arroyo | 3.935 | 1974-1986 | |
| 17 | Rogelio Armenteros | 3.952 | 2017-2027 | |
| 18 | Rich Bordi | 3.981 | 1981-1990 | |
| 19 | Herman Besse | 4.004 | 1947-1954 | |
| 20 | Paul Abbott | 4.018 | 1990-2003 | |
| 21 | Jharel Cotton | 4.047 | 2015-2024 | |
| 22 | Mike Gould# | 4.097 | 2027-2036 | |
| 23 | Brian Sweeney | 4.113 | 1999-2012 | |
| 24 | Travis Driskill | 4.123 | 2000-2007 | |
| 25 | Chad Willoughby# | 4.148 | 2030-2036 | |
| 26 | Casey Coleman | 4.154 | 2010-2018 | |
| 27 | Caleb Rainer# | 4.192 | 2030-2036 | |
| 28 | Yusmeiro Petit | 4.193 | 2006-2020 | |
| 29 | Brad Brennan | 4.214 | 2025-2033 | |
| 30 | Eddie Bane | 4.218 | 1974-1980 | |
| 31 | Tony Vaca# | 4.229 | 2029-2035 | |
| 32 | Jerome Williams | 4.271 | 2002-2016 | |
| 33 | Johnny Roeder# | 4.293 | 2028-2036 | |
| 34 | Brad A. Mills | 4.305 | 2009-2016 | |
| 35 | Josiah Gray | 4.328 | 2021-2033 | |
| 36 | Edgar G. Gonzalez | 4.398 | 2003-2012 | |
| 37 | Ronald Bolanos | 4.430 | 2020-2032 | |
| 38 | Wade LeBlanc | 4.438 | 2008-2019 | |
| 39 | Bill Atkinson | 4.446 | 1975-1983 | |
| 40 | Derek Botelho | 4.477 | 1982-1987 | |
| 41 | Rich Barnes | 4.531 | 1979-1985 | |
| 42 | Mike Hinkle# | 4.532 | 2028-2035 | |
| 43 | Art McLean# | 4.627 | 2027-2036 | |
| 44 | Hector Encinas# | 4.662 | 2027-2036 | |
| 45 | Bryan Corey | 4.694 | 1998-2009 | |
| 46 | Chris Spencer# | 4.702 | 2025-2032 | |
| 47 | Nick Bush | 4.714 | 2021-2027 | |
| 48 | Billy Buckner | 4.739 | 2007-2016 | |
| 49 | Matt Palmer | 4.749 | 2006-2014 | |
| 50 | Jake Buchanan | 4.804 | 2012-2019 | |
| 51 | Jim Dobbins# | 4.855 | 2029-2036 | |
| 52 | Tim Dillard | 4.864 | 2007-2020 | |
| 53 | Nabil Crismatt | 4.946 | 2018-2026 | |
| 54 | Jose Suarez | 4.962 | 2018-2033 | |
| 55 | Chris Peltier# | 5.021 | 2031-2036 | |
| 56 | Eric Stults | 5.026 | 2005-2015 | |
| 57 | Alan Benes | 5.027 | 1999-2006 | |
| 58 | Chris George | 5.147 | 2000-2008 | |
| 59 | Zach T. Jackson | 5.170 | 2006-2013 | |
| 60 | Ricky Zarycki | 5.215 | 2026-2034 | |
| 61 | Karl Kauffmann | 5.347 | 2022-2027 | |
| 62 | David Miller | 5.349 | 2025-2031 | |
| 63 | Zach Lee | 5.353 | 2014-2020 | |
| 64 | Clayton Mortensen | 5.358 | 2008-2017 | |
| 65 | C.J. Labbe | 5.490 | 2027-2031 |
