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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Luke Scrimger# | 0.48 | 2023 | |
| 2 | Oscar Malave# | 0.67 | 2018 | |
| 2 | William Deel# | 0.67 | 2023 | |
| 4 | Andy Waring# | 0.69 | 2022 | |
| 4 | Adam D'Alberto# | 0.69 | 2020 | |
| 4 | Joe Hart# | 0.69 | 2015 | |
| 7 | Corey Gruver# | 0.70 | 2010 | |
| 8 | Joe Hart# | 0.71 | 2024 | |
| 9 | Iliana Preciado | 0.72 | 2005 | |
| 9 | Mike Nave | 0.72 | 2014 | |
| 11 | Evan Pullman# | 0.73 | 2022 | |
| 11 | Felipe Gonzalez | 0.73 | 2016 | |
| 13 | Brian Prince | 0.74 | 2016 | |
| 14 | Rodrigo Lemus# | 0.76 | 2016 | |
| 15 | Tom Kitko | 0.78 | 2021 | |
| 15 | Pat Payne | 0.78 | 2011 | |
| 15 | Johnny Keener# | 0.78 | 2017 | |
| 18 | Bill Flowers# | 0.79 | 2012 | |
| 18 | Takeji Takano# | 0.79 | 2025 | |
| 18 | Sean Bartol | 0.79 | 2006 | |
| 21 | Paul Ledford* | 0.80 | 2008 | |
| 21 | Corey Gruver# | 0.80 | 2014 | |
| 23 | Chris Mattison | 0.81 | 2014 | |
| 23 | Jorge Valdez | 0.81 | 2010 | |
| 23 | Dave Harvey# | 0.81 | 2025 | |
| 26 | Yosaburo Kanda | 0.83 | 2014 | |
| 26 | Heriberto Milan | 0.83 | 2010 | |
| 26 | Joe Hart# | 0.83 | 2022 | |
| 29 | Bill Vasquez | 0.84 | 2008 | |
| 29 | Nate Briceno# | 0.84 | 2015 | |
| 31 | Josh Flaten# | 0.87 | 2015 | |
| 31 | Jordan Clarke | 0.87 | 2008 | |
| 31 | Cody Morosko | 0.87 | 2001 | |
| 34 | Adam D'Alberto# | 0.88 | 2022 | |
| 34 | Nick Slover# | 0.88 | 2024 | |
| 36 | Eric Burdine* | 0.89 | 2002 | |
| 36 | Kyle Ziegler | 0.89 | 2005 | |
| 36 | Jason Hollenbeck# | 0.89 | 2022 | |
| 39 | Antonio Higuera# | 0.90 | 2019 | |
| 39 | Albert Fabian# | 0.90 | 2020 | |
| 39 | Johnny Keener# | 0.90 | 2018 | |
| 39 | Bill Vasquez | 0.90 | 2003 | |
| 43 | Juan Fernandez# | 0.93 | 2025 | |
| 43 | Ben O'Halloran# | 0.93 | 2018 | |
| 43 | Paul Ledford* | 0.93 | 2005 | |
| 43 | Greg Sandlin | 0.93 | 2013 | |
| 47 | Andy Dooley# | 0.94 | 2021 | |
| 48 | Andy Weatherholt# | 0.95 | 2021 | |
| 48 | Gordie Clifford# | 0.95 | 2019 | |
| 48 | Rodrigo Lemus# | 0.95 | 2025 | |
| 51 | Adam Farmer | 0.96 | 2005 | |
| 51 | Zachary Christman# | 0.96 | 2018 | |
| 51 | Jonathan Luna | 0.96 | 2009 | |
| 51 | William Deel# | 0.96 | 2024 | |
| 55 | Heriberto Milan | 0.97 | 2011 | |
| 55 | Rodolfo Soto# | 0.97 | 2015 | |
| 55 | Juan Mendoza# | 0.97 | 2021 | |
| 58 | Justin Jemison# | 0.98 | 2019 | |
| 58 | Rodrigo Lemus# | 0.98 | 2017 | |
| 58 | Ron Baumgardner | 0.98 | 2012 | |
| 61 | Alfredo Tiscareno# | 0.99 | 2018 | |
| 61 | Rodrigo Lemus# | 0.99 | 2020 | |
| 63 | Du-sung Moon | 1.00 | 2008 | |
| 63 | Tom Franzoni* | 1.00 | 2005 | |
| 63 | Oscar Martinez | 1.00 | 2003 | |
| 63 | Sean Stevens# | 1.00 | 2023 | |
| 63 | John Way# | 1.00 | 2019 | |
| 63 | Kory Tourville | 1.00 | 2019 | |
| 63 | Logan Stone | 1.00 | 2016 | |
| 63 | Vance Adams | 1.00 | 2008 | |
| 63 | Emmanuel Mendoza | 1.00 | 2013 | |
| 63 | Julian Rangel | 1.00 | 2016 | |
| 63 | Jorge Lopez | 1.00 | 2006 | |
| 63 | William Deel# | 1.00 | 2025 | |
| 75 | Felipe Ayala# | 1.02 | 2018 | |
| 75 | Omar Cons# | 1.02 | 2023 | |
| 77 | Joe Hart# | 1.03 | 2016 | |
| 77 | Sam Campos# | 1.03 | 2023 | |
| 77 | Marty Capone# | 1.03 | 2019 | |
| 77 | Paul Ledford* | 1.03 | 2009 | |
| 77 | Miguel Isiordia | 1.03 | 2008 | |
| 82 | Elard Nijhuis | 1.04 | 2006 | |
| 82 | Bill Flowers# | 1.04 | 2011 | |
| 82 | Travis Gross | 1.04 | 2017 | |
| 82 | Xiang-ling Fei* | 1.04 | 2008 | |
| 82 | Adrian Radecki | 1.04 | 2013 | |
| 87 | Paul Ledford* | 1.05 | 2012 | |
| 87 | Nate Briceno# | 1.05 | 2016 | |
| 87 | Chris McLure | 1.05 | 2008 | |
| 87 | Miguel Berrios# | 1.05 | 2019 | |
| 91 | Dan Miller# | 1.06 | 2019 | |
| 91 | Blake Barber | 1.06 | 2005 | |
| 91 | Jody Fouse# | 1.06 | 2017 | |
| 91 | Chris Mattison | 1.06 | 2013 | |
| 95 | Jonathan Roten | 1.07 | 2018 | |
| 95 | Alejandro Marquina | 1.07 | 2013 | |
| 95 | Geremia Farinelli | 1.07 | 2000 | |
| 95 | Eric Burdine* | 1.07 | 2011 | |
| 99 | Jonathan Allen# | 1.08 | 2020 | |
| 99 | David Edgemon# | 1.08 | 2023 |
