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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Rich Forbes# | 0.78 | 2013-2025 | |
| 2 | Corey Johnson | 0.81 | 2010-2020 | |
| 3 | Nick Slover# | 0.82 | 2022-2025 | |
| 4 | Carlos Pardo | 0.83 | 2012-2021 | |
| 5 | Nelson Cirilo | 0.85 | 2007-2014 | |
| 6 | Chris Mattison | 0.87 | 2012-2019 | |
| 7 | William Deel# | 0.91 | 2022-2025 | |
| 8 | Takeji Takano# | 0.95 | 2024-2025 | |
| 8 | Francisco Camacho | 0.95 | 2000-2013 | |
| 8 | Oreste Comollo | 0.95 | 2001-2014 | |
| 11 | Felipe Gonzalez | 0.96 | 2011-2020 | |
| 11 | Oscar Martinez | 0.96 | 2000-2010 | |
| 11 | Sergio Martinez | 0.96 | 2005-2017 | |
| 11 | Luke Scrimger# | 0.96 | 2019-2025 | |
| 15 | Brett Dorman | 0.97 | 2005-2019 | |
| 15 | Todd Thompson# | 0.97 | 2015-2025 | |
| 17 | Cameron Hutchinson# | 0.99 | 2015-2025 | |
| 18 | Paul Ledford* | 1.00 | 2000-2013 | |
| 18 | Jeff Buck# | 1.00 | 2015-2025 | |
| 18 | Josh Huggins# | 1.00 | 2022-2025 | |
| 18 | Brian Prince | 1.00 | 2011-2024 | |
| 22 | Joe Hart# | 1.01 | 2013-2025 | |
| 23 | Nate Briceno# | 1.02 | 2015-2025 | |
| 23 | Dan Miller# | 1.02 | 2018-2025 | |
| 23 | Aubrey Morrison | 1.02 | 2000-2011 | |
| 26 | Rodrigo Lemus# | 1.03 | 2013-2025 | |
| 26 | William Arredondo | 1.03 | 2000-2012 | |
| 28 | Adam D'Alberto# | 1.04 | 2016-2025 | |
| 28 | Heriberto Milan | 1.04 | 2007-2022 | |
| 28 | Dave Harvey# | 1.04 | 2020-2025 | |
| 31 | Johnny Keener# | 1.05 | 2015-2025 | |
| 31 | Sean Bartol | 1.05 | 2000-2010 | |
| 31 | Hiromi Fukuda | 1.05 | 2006-2018 | |
| 34 | Tom Kitko | 1.07 | 2012-2023 | |
| 35 | Jose Rodriguez* | 1.08 | 2000-2016 | |
| 35 | Chris Frost | 1.08 | 2011-2022 | |
| 35 | Gordie Clifford# | 1.08 | 2013-2024 | |
| 35 | Jordan Clarke | 1.08 | 2004-2023 | |
| 39 | Vance Adams | 1.09 | 2000-2013 | |
| 39 | Hethum Manasarian | 1.09 | 2001-2020 | |
| 41 | Aaron Sutton | 1.10 | 2009-2021 | |
| 41 | Brad Hower | 1.10 | 2010-2024 | |
| 41 | Bill Vasquez | 1.10 | 2000-2012 | |
| 44 | Barry McLamb# | 1.11 | 2013-2023 | |
| 45 | Adam Farmer | 1.12 | 2000-2009 | |
| 45 | Stephen Stride | 1.12 | 2011-2022 | |
| 45 | Marty Capone# | 1.12 | 2019-2024 | |
| 45 | Logan Stone | 1.12 | 2010-2022 | |
| 49 | Adrian Radecki | 1.13 | 2012-2019 | |
| 49 | Scott Schowalter | 1.13 | 2012-2021 | |
| 51 | Geremia Farinelli | 1.14 | 2000-2014 | |
| 51 | Omar Cons# | 1.14 | 2023-2025 | |
| 53 | Josh Flaten# | 1.15 | 2015-2025 | |
| 53 | Zachary Christman# | 1.15 | 2014-2025 | |
| 53 | Pat Payne | 1.15 | 2009-2023 | |
| 53 | Santos Martinez | 1.15 | 2000-2012 | |
| 53 | Corey Gruver# | 1.15 | 2006-2025 | |
| 53 | Matt Graham# | 1.15 | 2020-2025 | |
| 59 | Travis Thurber# | 1.16 | 2005-2024 | |
| 59 | Austin Bauer | 1.16 | 2005-2014 | |
| 59 | Ryan Henry# | 1.16 | 2022-2025 | |
| 59 | Jose Ojeda# | 1.16 | 2020-2025 | |
| 63 | Chris McLure | 1.17 | 2000-2010 | |
| 63 | Elard Nijhuis | 1.17 | 2000-2009 | |
| 65 | Pat Hovhannisian# | 1.18 | 2014-2025 | |
| 66 | Bill Flowers# | 1.19 | 2011-2025 | |
| 66 | Noah George | 1.19 | 2005-2017 | |
| 66 | Chris Johnson | 1.19 | 2007-2018 | |
| 66 | Blake Barber | 1.19 | 2000-2007 | |
| 66 | Sean Stevens# | 1.19 | 2023-2025 | |
| 71 | Chris Jacoby# | 1.20 | 2015-2025 | |
| 71 | Greg Sandlin | 1.20 | 2009-2024 | |
| 71 | Chris Harris | 1.20 | 2007-2020 | |
| 71 | Miguel Berrios# | 1.20 | 2018-2025 | |
| 75 | Alejandro Marquina | 1.21 | 2002-2016 | |
| 75 | Jorge Lopez | 1.21 | 2004-2013 | |
| 75 | Dan Mills# | 1.21 | 2014-2025 | |
| 75 | Alfredo Tiscareno# | 1.21 | 2010-2025 | |
| 79 | Kory Tourville# | 1.22 | 2014-2024 | |
| 79 | Du-sung Moon | 1.22 | 2002-2015 | |
| 79 | Antonio Higuera# | 1.22 | 2007-2025 | |
| 79 | Justin Jemison# | 1.22 | 2019-2025 | |
| 79 | Andy Dooley# | 1.22 | 2014-2025 | |
| 84 | Felipe Ayala# | 1.23 | 2013-2025 | |
| 84 | Hector Moralez | 1.23 | 2011-2019 | |
| 86 | Xiang-ling Fei* | 1.24 | 2000-2012 | |
| 86 | Jonathan Allen# | 1.24 | 2016-2025 | |
| 86 | Daishin Uchida | 1.24 | 2008-2016 | |
| 86 | Carlos Mendez# | 1.24 | 2011-2025 | |
| 90 | Eric Burdine* | 1.25 | 2000-2017 | |
| 91 | Sam Campos# | 1.26 | 2020-2025 | |
| 91 | Branden Covington# | 1.26 | 2024-2025 | |
| 93 | Phil Gregoire# | 1.27 | 2013-2025 | |
| 93 | Josh Shute | 1.27 | 2013-2018 | |
| 95 | David Nations | 1.28 | 2000-2008 | |
| 95 | Matt Schmid# | 1.28 | 2013-2023 | |
| 95 | David Edgemon# | 1.28 | 2021-2025 | |
| 98 | Miguel Isiordia | 1.29 | 2003-2012 | |
| 98 | Rodolfo Soto# | 1.29 | 2015-2025 | |
| 98 | Albert Fabian# | 1.29 | 2014-2025 |
