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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Alberto Nieves | 0.27 | 2030 | |
| 2 | Spencer Cox | 0.38 | 2028 | |
| 3 | Monzaemon Nakashima# | 0.39 | 2033 | |
| 4 | León Rivera | 0.44 | 2010 | |
| 5 | Jorge Gómez | 0.51 | 2031 | |
| 6 | Matt Bates | 0.54 | 2034 | |
| 7 | António Ávila | 0.59 | 2032 | |
| 8 | León Medina | 0.60 | 2028 | |
| 9 | José Orozco# | 0.61 | 2029 | |
| 10 | Shang-de Li# | 0.62 | 2033 | |
| 11 | Jorge Gómez | 0.64 | 2032 | |
| 12 | Colin Hopps | 0.65 | 2030 | |
| 13 | Ronnie Green | 0.66 | 2022 | |
| 14 | Roger Keller | 0.70 | 2022 | |
| 15 | George Moss# | 0.71 | 2033 | |
| 15 | Norberto Vega# | 0.71 | 2034 | |
| 15 | James McCoy# | 0.71 | 2039 | |
| 18 | Naozane Sakai# | 0.72 | 2038 | |
| 18 | José Mora# | 0.72 | 2039 | |
| 18 | Robby Parker# | 0.72 | 2030 | |
| 18 | Takashi Yamamoto# | 0.72 | 2039 | |
| 18 | Manuel Ávila# | 0.72 | 2030 | |
| 23 | Juan Canó | 0.73 | 2022 | |
| 24 | Ray Graham | 0.74 | 2019 | |
| 24 | Dave Costello# | 0.74 | 2038 | |
| 26 | José Tojeira# | 0.76 | 2031 | |
| 26 | Cristián Rodríguez# | 0.76 | 2038 | |
| 26 | Brian Gutiérrez# | 0.76 | 2029 | |
| 29 | Robbie Dupuis# | 0.77 | 2030 | |
| 29 | Jon Yates | 0.77 | 2029 | |
| 31 | Ogai Ono# | 0.78 | 2031 | |
| 31 | Manuel Ávila# | 0.78 | 2032 | |
| 31 | Yoshiaga Nakashima# | 0.78 | 2039 | |
| 31 | Ronnie Ruíz | 0.78 | 2032 | |
| 35 | Nick Shaw | 0.80 | 2030 | |
| 35 | Felipe Morán | 0.80 | 2029 | |
| 35 | Justin Barton | 0.80 | 2021 | |
| 35 | Manuel Ávila# | 0.80 | 2031 | |
| 35 | Alejandro Soto# | 0.80 | 2032 | |
| 40 | António Ayala | 0.81 | 2023 | |
| 40 | Nathan Dempster | 0.81 | 2027 | |
| 40 | Hiroyuki Nii | 0.81 | 2013 | |
| 43 | Darryl McClendon | 0.82 | 2018 | |
| 44 | Roberto Camacho | 0.83 | 2023 | |
| 44 | Victor McKay | 0.83 | 2032 | |
| 44 | Ernest Baker | 0.83 | 2011 | |
| 44 | Juan Santana | 0.83 | 2026 | |
| 48 | Geert Neefs# | 0.84 | 2030 | |
| 48 | Juan Coronado# | 0.84 | 2033 | |
| 48 | Atílio Gaivo | 0.84 | 2029 | |
| 48 | Hideaki Hasegawa# | 0.84 | 2039 | |
| 48 | Bang-xao Niu# | 0.84 | 2029 | |
| 53 | Euan MacKinlay# | 0.85 | 2035 | |
| 54 | Monzaemon Nakashima# | 0.86 | 2034 | |
| 55 | Seon-keun Yi | 0.87 | 2024 | |
| 55 | Rintaro Fukui# | 0.87 | 2038 | |
| 55 | José Aranda | 0.87 | 2021 | |
| 55 | Shou Saitou# | 0.87 | 2034 | |
| 55 | José Vázquez | 0.87 | 2030 | |
| 55 | Jake Bain# | 0.87 | 2038 | |
| 55 | Arinori Mochizuki | 0.87 | 2021 | |
| 62 | Seiichi Sakaguchi# | 0.88 | 2034 | |
| 62 | Kelvin Jones | 0.88 | 2022 | |
| 62 | Roberto Ruíz# | 0.88 | 2037 | |
| 62 | José Tojeira# | 0.88 | 2032 | |
| 62 | Taizo Miyata# | 0.88 | 2038 | |
| 67 | Alfredo Zambrano | 0.89 | 2030 | |
| 67 | Hoshi Ikarashi | 0.89 | 2025 | |
| 67 | Jorge Flores# | 0.89 | 2035 | |
| 70 | Shigochiyo Yamaguchi# | 0.90 | 2039 | |
| 70 | Marvin Moore | 0.90 | 2030 | |
| 70 | Robinson Herrera | 0.90 | 2021 | |
| 70 | Avery Carson | 0.90 | 2026 | |
| 70 | Masaru Kouki | 0.90 | 2035 | |
| 75 | Juan Jose Patino | 0.91 | 2029 | |
| 75 | José Vázquez | 0.91 | 2033 | |
| 77 | Luis Jiménez# | 0.92 | 2034 | |
| 77 | Johnny Arthur# | 0.92 | 2039 | |
| 77 | James MacQuistan# | 0.92 | 2031 | |
| 80 | Mike Ryan | 0.93 | 2026 | |
| 80 | Lance Harris# | 0.93 | 2036 | |
| 80 | Teo Beerens# | 0.93 | 2039 | |
| 80 | Lateef Kamomba | 0.93 | 2025 | |
| 84 | Francisco Chávez | 0.94 | 2011 | |
| 84 | Miguel Rosa | 0.94 | 2013 | |
| 84 | Brock Barrett | 0.94 | 2023 | |
| 87 | Silvio Bolt | 0.95 | 2033 | |
| 87 | Armando Sánchez# | 0.95 | 2038 | |
| 87 | Bob Murray | 0.95 | 2027 | |
| 90 | Er Tah# | 0.96 | 2035 | |
| 90 | Mugombe Issa | 0.96 | 2024 | |
| 90 | Kunisada Yasuda# | 0.96 | 2029 | |
| 90 | José López# | 0.96 | 2039 | |
| 94 | Héctor Ventura# | 0.97 | 2039 | |
| 94 | José Figueroa# | 0.97 | 2039 | |
| 94 | James Jordan | 0.97 | 2022 | |
| 97 | Ryan Dawson | 0.98 | 2009 | |
| 98 | Steve Casey | 1.00 | 2028 | |
| 98 | Kosami Suzuki# | 1.00 | 2038 | |
| 98 | Arturo Jiménez | 1.00 | 2019 |
