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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Jon Haynes# | 1.209 | 2015 | |
| 2 | Ryan Henry# | 1.280 | 2021 | |
| 3 | Luke Scrimger# | 1.554 | 2018 | |
| 4 | R.J. Lawhead# | 1.603 | 2019 | |
| 5 | Dave Shevlin | 1.614 | 2019 | |
| 6 | Bobby Ruzicka | 1.712 | 2011 | |
| 7 | Justin Erim# | 1.749 | 2018 | |
| 8 | Jaiden Harvey# | 1.776 | 2021 | |
| 9 | Luis Gonzalez | 1.793 | 2016 | |
| 10 | Rafael Estrella | 1.833 | 2013 | |
| 11 | Bill Meyers# | 1.835 | 2018 | |
| 12 | Bobby Moreno | 1.844 | 2016 | |
| 13 | Kyle Connell# | 1.850 | 2018 | |
| 14 | Danny Rivas | 1.898 | 2018 | |
| 14 | Bill Frazer# | 1.898 | 2025 | |
| 16 | Miguel Berrios# | 1.899 | 2017 | |
| 17 | Sean Cofield | 1.910 | 2018 | |
| 18 | Luis Maldonado | 1.913 | 2018 | |
| 19 | Rich Mack# | 1.960 | 2022 | |
| 20 | Tom Balletta# | 2.006 | 2025 | |
| 21 | Brett Conner | 2.007 | 2018 | |
| 22 | George Kent | 2.036 | 2018 | |
| 23 | John Dollar# | 2.047 | 2018 | |
| 24 | Eddie Pioquinto | 2.051 | 2008 | |
| 25 | Donnie Marcus | 2.077 | 2017 | |
| 25 | Justin Baker# | 2.077 | 2016 | |
| 27 | Pat Gonzalez | 2.086 | 2005 | |
| 28 | Dan Cormie | 2.126 | 2017 | |
| 29 | George Wilson | 2.133 | 2021 | |
| 30 | Tony Espinoza# | 2.144 | 2022 | |
| 31 | Chris Graham# | 2.146 | 2015 | |
| 31 | Tom Rise# | 2.146 | 2019 | |
| 33 | Jonathan Marquina# | 2.158 | 2015 | |
| 34 | Tom Tchida# | 2.167 | 2018 | |
| 35 | Nick Giese | 2.174 | 2007 | |
| 36 | Mickey Ferrell# | 2.181 | 2012 | |
| 37 | Cameron Outlaw# | 2.184 | 2017 | |
| 38 | Phil Dalton# | 2.185 | 2018 | |
| 38 | Jaylin Moyer# | 2.185 | 2025 | |
| 40 | Danny Larimer | 2.196 | 2021 | |
| 41 | Mario Palomera | 2.199 | 2019 | |
| 42 | Chris Marquis# | 2.200 | 2018 | |
| 43 | Roger Vanatta | 2.201 | 2012 | |
| 44 | Tom Rise# | 2.209 | 2022 | |
| 45 | Jadon Bernard# | 2.219 | 2014 | |
| 46 | Federico Gonzalez | 2.224 | 2004 | |
| 47 | George Kent | 2.225 | 2015 | |
| 48 | Craig Conkin | 2.240 | 2005 | |
| 48 | Justin Hesley# | 2.240 | 2025 | |
| 50 | Gabe Vincent | 2.241 | 2017 | |
| 51 | Mike Davis | 2.246 | 2017 | |
| 52 | Dustin Robinson | 2.250 | 2017 | |
| 52 | Josh Riese# | 2.250 | 2023 | |
| 52 | Danny Offen# | 2.250 | 2020 | |
| 55 | Ralph Friedman | 2.254 | 2018 | |
| 56 | Mark Herrera# | 2.255 | 2023 | |
| 57 | Russ Allen | 2.260 | 2001 | |
| 57 | Jonathan Massengale | 2.260 | 2013 | |
| 59 | Tony Espinoza# | 2.265 | 2025 | |
| 60 | Luis Maldonado | 2.285 | 2019 | |
| 61 | Doug Yost | 2.300 | 2015 | |
| 61 | George Robertson# | 2.300 | 2023 | |
| 63 | Logan Stone | 2.304 | 2010 | |
| 64 | Johnny Keener# | 2.305 | 2014 | |
| 65 | Josh Flaten# | 2.309 | 2014 | |
| 66 | Michael Flood | 2.319 | 2012 | |
| 67 | Josh Woods | 2.323 | 2017 | |
| 68 | Chris Simon# | 2.337 | 2018 | |
| 69 | Colin Esser# | 2.342 | 2021 | |
| 70 | Steve Bolling | 2.348 | 2015 | |
| 71 | Toshimichi Miyakawa# | 2.356 | 2019 | |
| 72 | Frank Sarabia# | 2.357 | 2025 | |
| 73 | Enrique Perez | 2.364 | 2017 | |
| 74 | Mike Anderson | 2.367 | 2019 | |
| 75 | Andres Moran | 2.381 | 2012 | |
| 76 | Sean Cofield | 2.388 | 2017 | |
| 77 | Miguel Isiordia | 2.393 | 2003 | |
| 78 | Josh Shropshire# | 2.400 | 2021 | |
| 79 | Byron Stanton# | 2.411 | 2023 | |
| 80 | Donnie Marcus | 2.416 | 2020 | |
| 81 | Ernie Hancock | 2.422 | 2019 | |
| 82 | Sean Cofield | 2.423 | 2013 | |
| 83 | Rich Roberts# | 2.426 | 2018 | |
| 84 | Isaiah Robinson# | 2.439 | 2019 | |
| 85 | J.R. Mitchell# | 2.444 | 2012 | |
| 86 | Enrique Perez | 2.445 | 2015 | |
| 87 | Matt Alms | 2.450 | 2015 | |
| 88 | Raul Albino | 2.455 | 2017 | |
| 88 | Dan Wenger | 2.455 | 2018 | |
| 88 | Mike Skowronski | 2.455 | 2014 | |
| 91 | Sean Cofield | 2.460 | 2020 | |
| 91 | Nate McClaskey# | 2.460 | 2024 | |
| 93 | Billy Merner# | 2.463 | 2016 | |
| 94 | Jesus Rodriguez | 2.464 | 2007 | |
| 94 | Rodney Caporn# | 2.464 | 2016 | |
| 96 | Antonio Alvarez# | 2.472 | 2022 | |
| 97 | Jonathan Massengale | 2.473 | 2015 | |
| 98 | Sean Cofield | 2.475 | 2019 | |
| 99 | Aaron O'Brien# | 2.477 | 2025 | |
| 100 | Jesus Fernandez# | 2.479 | 2017 |
