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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Oscar Malave# | 0.67 | 2018 | |
| 2 | Adam D'Alberto# | 0.69 | 2020 | |
| 2 | Joe Hart# | 0.69 | 2015 | |
| 4 | Corey Gruver# | 0.70 | 2010 | |
| 5 | Iliana Preciado | 0.72 | 2005 | |
| 5 | Mike Nave | 0.72 | 2014 | |
| 7 | Felipe Gonzalez# | 0.73 | 2016 | |
| 8 | Brian Prince# | 0.74 | 2016 | |
| 9 | Rodrigo Lemus# | 0.76 | 2016 | |
| 10 | Tom Kitko# | 0.78 | 2021 | |
| 10 | Pat Payne# | 0.78 | 2011 | |
| 10 | Johnny Keener# | 0.78 | 2017 | |
| 13 | Bill Flowers# | 0.79 | 2012 | |
| 13 | Sean Bartol | 0.79 | 2006 | |
| 15 | Paul Ledford* | 0.80 | 2008 | |
| 15 | Corey Gruver# | 0.80 | 2014 | |
| 17 | Chris Mattison# | 0.81 | 2014 | |
| 17 | Jorge Valdez | 0.81 | 2010 | |
| 19 | Yosaburo Kanda# | 0.83 | 2014 | |
| 19 | Heriberto Milan# | 0.83 | 2010 | |
| 21 | Bill Vasquez | 0.84 | 2008 | |
| 21 | Nate Briceno# | 0.84 | 2015 | |
| 23 | Josh Flaten# | 0.87 | 2015 | |
| 23 | Cody Morosko | 0.87 | 2001 | |
| 23 | Jordan Clarke# | 0.87 | 2008 | |
| 26 | Eric Burdine | 0.89 | 2002 | |
| 26 | Kyle Ziegler | 0.89 | 2005 | |
| 28 | Antonio Higuera# | 0.90 | 2019 | |
| 28 | Johnny Keener# | 0.90 | 2018 | |
| 28 | Albert Fabian# | 0.90 | 2020 | |
| 28 | Bill Vasquez | 0.90 | 2003 | |
| 32 | Ben O'Halloran# | 0.93 | 2018 | |
| 32 | Greg Sandlin# | 0.93 | 2013 | |
| 32 | Paul Ledford* | 0.93 | 2005 | |
| 35 | Andy Dooley# | 0.94 | 2021 | |
| 36 | Andy Weatherholt# | 0.95 | 2021 | |
| 36 | Gordie Clifford# | 0.95 | 2019 | |
| 38 | Adam Farmer | 0.96 | 2005 | |
| 38 | Zachary Christman# | 0.96 | 2018 | |
| 38 | Jonathan Luna | 0.96 | 2009 | |
| 41 | Heriberto Milan# | 0.97 | 2011 | |
| 41 | Rodolfo Soto# | 0.97 | 2015 | |
| 41 | Juan Mendoza# | 0.97 | 2021 | |
| 44 | Justin Jemison# | 0.98 | 2019 | |
| 44 | Ron Baumgardner | 0.98 | 2012 | |
| 44 | Rodrigo Lemus# | 0.98 | 2017 | |
| 47 | Alfredo Tiscareno# | 0.99 | 2018 | |
| 47 | Rodrigo Lemus# | 0.99 | 2020 | |
| 49 | Vance Adams | 1.00 | 2008 | |
| 49 | Emmanuel Mendoza# | 1.00 | 2013 | |
| 49 | Logan Stone# | 1.00 | 2016 | |
| 49 | Du-sung Moon | 1.00 | 2008 | |
| 49 | Oscar Martinez | 1.00 | 2003 | |
| 49 | Julian Rangel | 1.00 | 2016 | |
| 49 | Kory Tourville# | 1.00 | 2019 | |
| 49 | Tom Franzoni* | 1.00 | 2005 | |
| 49 | John Way# | 1.00 | 2019 | |
| 49 | Jorge Lopez | 1.00 | 2006 | |
| 59 | Felipe Ayala# | 1.02 | 2018 | |
| 60 | Joe Hart# | 1.03 | 2016 | |
| 60 | Marty Capone# | 1.03 | 2019 | |
| 60 | Miguel Isiordia | 1.03 | 2008 | |
| 60 | Paul Ledford* | 1.03 | 2009 | |
| 64 | Elard Nijhuis | 1.04 | 2006 | |
| 64 | Bill Flowers# | 1.04 | 2011 | |
| 64 | Travis Gross# | 1.04 | 2017 | |
| 64 | Xiang-ling Fei* | 1.04 | 2008 | |
| 64 | Adrian Radecki# | 1.04 | 2013 | |
| 69 | Paul Ledford* | 1.05 | 2012 | |
| 69 | Nate Briceno# | 1.05 | 2016 | |
| 69 | Chris McLure | 1.05 | 2008 | |
| 69 | Miguel Berrios# | 1.05 | 2019 | |
| 73 | Dan Miller# | 1.06 | 2019 | |
| 73 | Blake Barber | 1.06 | 2005 | |
| 73 | Jody Fouse# | 1.06 | 2017 | |
| 73 | Chris Mattison# | 1.06 | 2013 | |
| 77 | Geremia Farinelli | 1.07 | 2000 | |
| 77 | Alejandro Marquina | 1.07 | 2013 | |
| 77 | Jonathan Roten# | 1.07 | 2018 | |
| 77 | Eric Burdine | 1.07 | 2011 | |
| 81 | Jonathan Allen# | 1.08 | 2020 | |
| 81 | Pat Payne# | 1.08 | 2014 | |
| 81 | Aaron Sutton | 1.08 | 2012 | |
| 84 | Antonio Higuera# | 1.09 | 2009 | |
| 84 | Phil Gregoire# | 1.09 | 2016 | |
| 84 | Pat Hovhannisian# | 1.09 | 2016 | |
| 84 | Jonathan Luna | 1.09 | 2007 | |
| 84 | Rodrigo Lemus# | 1.09 | 2015 | |
| 89 | Rodolfo Soto# | 1.10 | 2020 | |
| 90 | Eric Burdine | 1.11 | 2009 | |
| 91 | Eric Burdine | 1.12 | 2010 | |
| 91 | Josh Flaten# | 1.12 | 2019 | |
| 91 | Xiang-ling Fei* | 1.12 | 2005 | |
| 94 | Byung-sik Lee | 1.13 | 2006 | |
| 94 | Justin Turbeville | 1.13 | 2014 | |
| 96 | Jay Helm# | 1.14 | 2019 | |
| 96 | Alfredo Tiscareno# | 1.14 | 2014 | |
| 96 | Chad Stokes | 1.14 | 2009 | |
| 96 | Eric Burdine | 1.14 | 2015 | |
| 100 | Tom Kitko# | 1.15 | 2015 |
