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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Jimmy Naughton | 3.047 | 2010-2022 | |
| 2 | Dave Michno | 3.078 | 1997-2007 | |
| 3 | Samuel Holroyd# | 3.101 | 2047-2056 | |
| 4 | Shawn Matheson# | 3.112 | 2048-2060 | |
| 5 | Gary Hampton | 3.136 | 2045-2058 | |
| 6 | Kong Li | 3.188 | 2005-2017 | |
| 7 | Frank McCarthy | 3.197 | 2045-2051 | |
| 8 | Quenton Wagner# | 3.212 | 2054-2060 | |
| 9 | Sean Jenkins# | 3.260 | 2050-2058 | |
| 10 | Casey Luder# | 3.283 | 2046-2054 | |
| 11 | Cris Morán | 3.316 | 1989-2001 | |
| 12 | Terry Gould | 3.341 | 1997-2006 | |
| 13 | Héctor López | 3.411 | 1985-1998 | |
| 14 | Levi Marinaccio | 3.412 | 2045-2058 | |
| 15 | Peyton Schwartz# | 3.429 | 2045-2057 | |
| 16 | Frank Tucker | 3.430 | 1988-2002 | |
| 17 | Nolan Hunter | 3.443 | 2047-2054 | |
| 18 | Ed Steinbach | 3.481 | 2025-2039 | |
| 19 | Eros Cook | 3.499 | 1985-1998 | |
| 20 | Gene Ferguson | 3.520 | 1990-2000 | |
| 21 | Frisco Cuellar | 3.534 | 1996-2006 | |
| 22 | Anastasio López | 3.553 | 1986-1997 | |
| 23 | Grant Walker# | 3.593 | 2046-2060 | |
| 24 | Dave Neira | 3.620 | 2023-2035 | |
| 25 | Abdel McElwee# | 3.625 | 2052-2059 | |
| 26 | Lyndon Williams | 3.630 | 1991-2001 | |
| 27 | Jack Blandine# | 3.651 | 2052-2060 | |
| 28 | Dave Behymer | 3.665 | 2027-2037 | |
| 29 | Jeremy Fritzinger# | 3.680 | 2049-2060 | |
| 30 | Larent Nielson# | 3.683 | 2047-2060 | |
| 31 | Brice Daniels | 3.698 | 2039-2057 | |
| 32 | Tommy Fisher | 3.699 | 1993-2004 | |
| 33 | Clarence Lyon | 3.709 | 1992-2010 | |
| 34 | Nate Bettis | 3.711 | 2024-2040 | |
| 35 | Jordan Vidal | 3.717 | 2001-2010 | |
| 36 | Tommy Stipe# | 3.789 | 2048-2059 | |
| 37 | Jacob Dover# | 3.796 | 2048-2060 | |
| 38 | Pepe Sánchez | 3.821 | 1989-1996 | |
| 39 | Jaden Chatman | 3.829 | 2045-2056 | |
| 40 | Ricky Alvarez | 3.878 | 2000-2015 | |
| 41 | Tokuyuki Migita | 3.889 | 1994-2003 | |
| 42 | Preston Parnell# | 3.910 | 2050-2060 | |
| 43 | Pat Hall | 3.964 | 2012-2017 | |
| 44 | Adelaide Sarafana | 4.027 | 1993-2003 | |
| 45 | Joey Erickson | 4.062 | 2020-2029 | |
| 46 | Erik Crumb | 4.073 | 2027-2036 | |
| 47 | Tucker Keith# | 4.075 | 2043-2059 | |
| 48 | Tony Garrett | 4.181 | 2026-2039 | |
| 49 | Derek Nabavi# | 4.229 | 2049-2058 | |
| 50 | T.J. Millington | 4.254 | 2026-2034 | |
| 51 | Joseph Starnes# | 4.266 | 2050-2060 | |
| 52 | Casey Fish# | 4.297 | 2054-2059 | |
| 53 | Griffin Heustis | 4.321 | 2046-2058 | |
| 54 | Morgan Butler# | 4.360 | 2051-2060 | |
| 55 | Thomas Porter# | 4.393 | 2051-2060 | |
| 56 | Oscar Howarth# | 4.427 | 2054-2060 | |
| 57 | Joseph Battle# | 4.518 | 2055-2060 | |
| 58 | Pancho García | 4.616 | 1986-2000 | |
| 59 | Duran Murphy# | 4.649 | 2053-2059 | |
| 60 | Dan McInroy | 4.653 | 1982-1993 | |
| 61 | Judd Shankle# | 5.089 | 2055-2060 | |
| 62 | Ralph Michelson# | 5.145 | 2053-2060 |
