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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Seong-rae An# | 0.911 | 2029 | |
| 2 | Calvin Townend | 0.913 | 2014 | |
| 3 | Leland Bullins# | 0.950 | 2031 | |
| 3 | John Martin | 0.950 | 2012 | |
| 5 | Randy Hamilton | 0.952 | 2015 | |
| 6 | Senzo Nakashima | 0.963 | 2023 | |
| 6 | Pat McConnell# | 0.963 | 2028 | |
| 8 | David White | 0.988 | 2015 | |
| 9 | Gonzalo Núñez | 1.016 | 2016 | |
| 10 | Eisuke Ota# | 1.026 | 2026 | |
| 11 | Max Grant# | 1.036 | 2020 | |
| 11 | Ijaz Kharoti# | 1.036 | 2027 | |
| 13 | Yoritomo Ine | 1.038 | 2018 | |
| 14 | José Contreras | 1.052 | 2015 | |
| 15 | Chuk-yan Chio | 1.063 | 2028 | |
| 16 | Sam Hatt | 1.084 | 2022 | |
| 17 | Robert Avila# | 1.085 | 2028 | |
| 18 | Noriaki Kichida | 1.086 | 2017 | |
| 19 | Kichibei Ozawa | 1.087 | 2025 | |
| 20 | Jason Atkinson | 1.096 | 2024 | |
| 21 | Lincoln Brouillette | 1.109 | 2014 | |
| 22 | Frank Hillier# | 1.143 | 2031 | |
| 23 | David Bryan | 1.167 | 2021 | |
| 24 | Hiroya Yoshida | 1.174 | 2018 | |
| 25 | Max Grant# | 1.176 | 2021 | |
| 26 | Adam Pitkeathy# | 1.190 | 2028 | |
| 27 | Tom Collins | 1.200 | 2019 | |
| 28 | José Castillo | 1.208 | 2024 | |
| 29 | Cliff Clark | 1.210 | 2012 | |
| 30 | Keith Rogers | 1.212 | 2024 | |
| 30 | Teguh Suharto# | 1.212 | 2025 | |
| 32 | Jayakar Ramadin | 1.216 | 2022 | |
| 33 | Paul Woodrow# | 1.225 | 2025 | |
| 34 | Gonzalo Ramírez# | 1.267 | 2032 | |
| 35 | George Clay | 1.268 | 2021 | |
| 36 | Dave Munier# | 1.278 | 2031 | |
| 37 | Matt Calderón# | 1.286 | 2029 | |
| 38 | Javier Hernández | 1.300 | 2017 | |
| 39 | Paul Johnston# | 1.322 | 2025 | |
| 40 | Douglas Pantall# | 1.324 | 2032 | |
| 41 | Saiyid Mashwanis# | 1.333 | 2027 | |
| 42 | Sakutaro Eida | 1.346 | 2014 | |
| 43 | Jeremy Shaw# | 1.373 | 2029 | |
| 44 | Baltwin Baars# | 1.375 | 2024 | |
| 44 | Phil Phillips# | 1.375 | 2026 | |
| 44 | Van Perry# | 1.375 | 2029 | |
| 47 | Kirk Snyder | 1.377 | 2015 | |
| 48 | Luis Sandoval | 1.381 | 2014 | |
| 49 | Jason Atkinson | 1.393 | 2026 | |
| 50 | Raymond Riley# | 1.412 | 2030 | |
| 51 | Chris Baxter | 1.435 | 2018 | |
| 52 | António Encarnación | 1.438 | 2027 | |
| 52 | Alejandro García# | 1.438 | 2020 | |
| 54 | Matt Nolan# | 1.448 | 2030 | |
| 55 | Garth Daniels# | 1.455 | 2026 | |
| 56 | Tom Hanson# | 1.469 | 2023 | |
| 57 | Edgar Pérez | 1.472 | 2019 | |
| 58 | Daniel Díaz | 1.476 | 2012 | |
| 59 | Ernesto Villegas# | 1.500 | 2023 | |
| 59 | Tom Collins | 1.500 | 2023 | |
| 61 | Frank Cronshaw# | 1.518 | 2026 | |
| 62 | Kang-il Hyong# | 1.531 | 2028 | |
| 63 | Jesús Díaz# | 1.532 | 2031 | |
| 64 | Terumoto Yamamoto | 1.550 | 2018 | |
| 65 | Mehmood Dar# | 1.560 | 2020 | |
| 65 | Jake Robinson | 1.560 | 2019 | |
| 67 | Julian Fanner# | 1.620 | 2028 | |
| 68 | Bernard Dupuis | 1.622 | 2017 | |
| 69 | Kulapati Pandian# | 1.636 | 2021 | |
| 70 | Carl Veeck# | 1.673 | 2029 | |
| 71 | Jin-song Cheung | 1.680 | 2019 | |
| 72 | James Thompson# | 1.696 | 2024 | |
| 73 | Gabresilassie Cherono# | 1.765 | 2021 | |
| 74 | Kichibei Endo# | 1.770 | 2028 | |
| 75 | Fernando López# | 1.787 | 2026 | |
| 76 | Mehmood Dar# | 1.824 | 2021 | |
| 77 | Luis López | 1.862 | 2012 | |
| 78 | James Stevens# | 1.881 | 2032 | |
| 79 | David Duhamel | 2.200 | 2019 | |
| 79 | Nobuhiko Kobayashi | 2.200 | 2017 |
