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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Jimmy Hsia# | 0.91 | 2067-2081 | |
| 2 | Tyler Searle* | 0.93 | 2050-2067 | |
| 2 | Ron Isham* | 0.93 | 1990-1999 | |
| 4 | Joseph Andande | 0.97 | 2034-2050 | |
| 5 | Eddie Izurieta# | 0.99 | 2063-2081 | |
| 6 | John Giffin | 1.00 | 2058-2072 | |
| 7 | Luis Ríos | 1.01 | 1990-2005 | |
| 7 | Slider Brooks# | 1.01 | 2073-2081 | |
| 9 | Vicente Cabrera | 1.02 | 1990-1999 | |
| 9 | Kenji Matsumoto | 1.02 | 2035-2042 | |
| 11 | Lachlan Davies* | 1.03 | 2001-2014 | |
| 11 | Peter Loffgren | 1.03 | 2036-2054 | |
| 11 | Nathan Fry* | 1.03 | 2033-2054 | |
| 11 | Rafael Escobar# | 1.03 | 2073-2080 | |
| 11 | Luis Alfonzo* | 1.03 | 1990-2006 | |
| 16 | Mario Ausosa* | 1.04 | 1998-2017 | |
| 16 | Nick Tamulevich# | 1.04 | 2072-2081 | |
| 18 | Raymond Boucher | 1.05 | 2037-2050 | |
| 19 | Anthony McBride | 1.06 | 1993-2004 | |
| 20 | R.J. Mendenhall# | 1.07 | 2075-2081 | |
| 20 | James Henderson* | 1.07 | 1993-2009 | |
| 20 | Jerry Hildebrandt* | 1.07 | 1999-2016 | |
| 20 | Julio Olivo# | 1.07 | 2067-2081 | |
| 20 | Ernesto Torrez* | 1.07 | 1990-2012 | |
| 20 | Reed Sentner* | 1.07 | 2024-2044 | |
| 20 | John Hersey | 1.07 | 2064-2081 | |
| 20 | Scott Deal* | 1.07 | 2037-2057 | |
| 20 | Alex Amarante | 1.07 | 2061-2074 | |
| 20 | Steven Gibbs* | 1.07 | 1990-2007 | |
| 30 | Joe Quarterman* | 1.08 | 2060-2077 | |
| 30 | Jason Dennis | 1.08 | 1990-1995 | |
| 30 | Kenny Grant | 1.08 | 2040-2053 | |
| 30 | Lonnie Ward | 1.08 | 1990-2005 | |
| 30 | Mitchell Rudder* | 1.08 | 1990-2006 | |
| 35 | Teruo Yamamoto | 1.09 | 2045-2056 | |
| 35 | Scott Smith* | 1.09 | 1990-2006 | |
| 35 | Carlos Díaz | 1.09 | 1990-2006 | |
| 35 | Jose Covarrubias* | 1.09 | 2062-2077 | |
| 39 | Jose Uresti# | 1.10 | 2066-2081 | |
| 39 | Mike Bradford* | 1.10 | 2000-2016 | |
| 39 | Luis Cantú* | 1.10 | 1990-2011 | |
| 39 | Sal Casamonica | 1.10 | 2053-2064 | |
| 39 | Sam Lawrence* | 1.10 | 2011-2031 | |
| 39 | Alberto García | 1.10 | 2021-2036 | |
| 39 | Tom O'Neal | 1.10 | 1990-2005 | |
| 39 | Austin Brick | 1.10 | 2059-2077 | |
| 47 | Franky Sanicencio* | 1.11 | 2051-2074 | |
| 47 | Marnolki Basteiro* | 1.11 | 2055-2071 | |
| 47 | Ramón Medina | 1.11 | 1990-2005 | |
| 47 | Marcos Fernández | 1.11 | 2045-2052 | |
| 47 | Freddie Jonas* | 1.11 | 1998-2016 | |
| 47 | Gonzalo Ramos | 1.11 | 1990-2005 | |
| 47 | Paul Richardson | 1.11 | 2038-2052 | |
| 54 | José Flores | 1.12 | 1990-1997 | |
| 54 | Luis Manuel Zamora* | 1.12 | 1993-2010 | |
| 54 | Tristan Brandt* | 1.12 | 2045-2062 | |
| 54 | Preston Clendinning | 1.12 | 2000-2015 | |
| 54 | Ricky Minjarez# | 1.12 | 2064-2081 | |
| 54 | Ryosei Watanabe | 1.12 | 2045-2059 | |
| 54 | Marcos Castillo* | 1.12 | 2005-2022 | |
| 54 | Ronald Evans | 1.12 | 1990-2006 | |
| 54 | Kenrich Keith* | 1.12 | 1996-2015 | |
| 54 | Matt Porter* | 1.12 | 2010-2024 | |
| 54 | Patrick McFarland | 1.12 | 1993-2013 | |
| 54 | Ji-hwan Kym | 1.12 | 2059-2079 | |
| 54 | Nicky Bisdu | 1.12 | 2002-2018 | |
| 67 | Quitério Alcaide | 1.13 | 2046-2058 | |
| 67 | Reggie Zorlu | 1.13 | 2048-2061 | |
| 67 | Alex Mijangos# | 1.13 | 2074-2081 | |
| 67 | Lucas LeBlanc | 1.13 | 2049-2065 | |
| 67 | Yoson Ine | 1.13 | 1990-2005 | |
| 67 | Honey Geier# | 1.13 | 2068-2081 | |
| 67 | Andre O'Grotty | 1.13 | 2008-2019 | |
| 67 | Pablo Tañon | 1.13 | 2050-2064 | |
| 67 | Gary Gordon | 1.13 | 2046-2060 | |
| 67 | Simon Lawrence | 1.13 | 2012-2030 | |
| 67 | Leonard Logan | 1.13 | 2002-2015 | |
| 78 | Jo Jo Lescaille | 1.14 | 2057-2069 | |
| 78 | Domingo Díaz | 1.14 | 1990-1997 | |
| 78 | Hitomaro Ogawa* | 1.14 | 2045-2059 | |
| 78 | Andy Frost | 1.14 | 2043-2063 | |
| 78 | Pedro Astorias | 1.14 | 2046-2059 | |
| 78 | David Zed | 1.14 | 2009-2018 | |
| 78 | Patrick Doyle | 1.14 | 1990-1997 | |
| 78 | Dave Rose | 1.14 | 1999-2014 | |
| 78 | Pancho Guerrero | 1.14 | 1990-2007 | |
| 78 | Vicente Ramírez | 1.14 | 1993-2010 | |
| 78 | Tyler Frank | 1.14 | 2001-2009 | |
| 78 | Jason Townsley | 1.14 | 2029-2046 | |
| 78 | Andreas Walters* | 1.14 | 2036-2053 | |
| 91 | Pedro Salas | 1.15 | 2020-2032 | |
| 91 | Michael Fridy | 1.15 | 2060-2080 | |
| 91 | Jimmy Baird | 1.15 | 1999-2012 | |
| 91 | Justin Samsel# | 1.15 | 2070-2079 | |
| 91 | Andres Anguiano# | 1.15 | 2065-2081 | |
| 91 | William Hoffman | 1.15 | 1990-1997 | |
| 91 | Jason Huff | 1.15 | 1990-2000 | |
| 91 | Fisko Loera# | 1.15 | 2063-2081 | |
| 91 | Sam Sappington | 1.15 | 1990-2009 | |
| 91 | Langley Frey | 1.15 | 2045-2058 |
