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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Dae Tam | 1.095 | 2014-2017 | |
| 2 | Kenji Matsumoto# | 1.101 | 2025-2043 | |
| 3 | Nobuyoshi Endo# | 1.158 | 2033-2042 | |
| 4 | Teruo Yamamoto# | 1.176 | 2037-2043 | |
| 5 | Yoriyoshi Hayagawa | 1.210 | 2014-2020 | |
| 6 | Robun Kondo | 1.235 | 2015-2026 | |
| 7 | Naozane Macha# | 1.236 | 2029-2038 | |
| 8 | Danjuro Chikafuji# | 1.240 | 2032-2041 | |
| 9 | Naizen Takuda | 1.244 | 2014-2019 | |
| 10 | Masato Kato | 1.263 | 2019-2034 | |
| 11 | Han-su Yun | 1.277 | 2020-2026 | |
| 12 | Ryu Koga | 1.279 | 2014-2025 | |
| 13 | Norio Tanaka | 1.281 | 2023-2031 | |
| 14 | Takehide Heida | 1.302 | 2022-2031 | |
| 15 | Davey Ryan | 1.305 | 2020-2026 | |
| 16 | Masujiro Sasaki# | 1.308 | 2031-2042 | |
| 17 | Terry Crabtree | 1.318 | 2017-2026 | |
| 18 | Allvaro Basto | 1.326 | 2014-2019 | |
| 19 | Carlos Morán# | 1.332 | 2037-2041 | |
| 20 | Matsuyo Adachi# | 1.333 | 2029-2037 | |
| 21 | Roland Mercer | 1.336 | 2014-2018 | |
| 22 | Don Thomas | 1.337 | 2017-2027 | |
| 23 | Reijiro Makino | 1.338 | 2014-2022 | |
| 24 | Shinichi Endo# | 1.339 | 2035-2043 | |
| 25 | Ieyoshi Kato# | 1.342 | 2034-2043 | |
| 26 | Arturo Coronado | 1.348 | 2014-2020 | |
| 27 | Akio Tanaka# | 1.349 | 2030-2041 | |
| 28 | Yoriyuki Maekawa | 1.350 | 2026-2036 | |
| 29 | Takahiro Suzuki | 1.353 | 2027-2037 | |
| 30 | Grant Friday# | 1.354 | 2038-2043 | |
| 31 | Kunisada Kaneko | 1.358 | 2023-2033 | |
| 32 | Azumamaro Kamimura | 1.366 | 2023-2031 | |
| 33 | Ciriaco Balsamo# | 1.371 | 2039-2043 | |
| 34 | Takahashi Yoshida | 1.380 | 2023-2032 | |
| 35 | Albert Banks | 1.392 | 2022-2030 | |
| 35 | Tommy Doyle | 1.392 | 2028-2033 | |
| 37 | Stephen Bywaters | 1.393 | 2029-2036 | |
| 37 | Yukinaga Watanabe | 1.393 | 2014-2022 | |
| 37 | Sakutaro Suitani | 1.393 | 2024-2033 | |
| 40 | Yoshihiro Murata | 1.400 | 2019-2031 | |
| 41 | Juan Betancourt | 1.404 | 2021-2026 | |
| 42 | Jason Miller | 1.409 | 2028-2036 | |
| 43 | Mauro Machado# | 1.410 | 2038-2043 | |
| 44 | Bailey McClellan | 1.411 | 2018-2024 | |
| 44 | Enrique Lima | 1.411 | 2034-2042 | |
| 46 | Shoyo Eda | 1.415 | 2023-2031 | |
| 47 | Moromao Sasaki | 1.419 | 2027-2037 | |
| 48 | Atsushi Saikawa# | 1.421 | 2036-2043 | |
| 48 | Toshiro Watanabe | 1.421 | 2014-2022 | |
| 50 | Juan Flores | 1.422 | 2014-2025 | |
| 51 | Cornelio Leyva | 1.423 | 2024-2031 | |
| 52 | John Barron | 1.432 | 2034-2042 | |
| 53 | John Jarville# | 1.433 | 2034-2039 | |
| 53 | Nathan Bower | 1.433 | 2016-2020 | |
| 55 | Tony Gómez | 1.439 | 2026-2032 | |
| 56 | Moromao Fujimoto# | 1.441 | 2037-2043 | |
| 56 | Mathieu Lambert | 1.441 | 2022-2028 | |
| 58 | Ikku Noda# | 1.442 | 2035-2043 | |
| 59 | Tabito Matsui | 1.445 | 2015-2024 | |
| 60 | Rafael Toro | 1.451 | 2015-2020 | |
| 61 | Yasuyuki Ishikawa | 1.453 | 2021-2030 | |
| 62 | Rikyu Narita# | 1.454 | 2027-2040 | |
| 63 | Rob Bannatyne | 1.458 | 2033-2038 | |
| 64 | Tetsuo Ojima | 1.459 | 2014-2023 | |
| 64 | Harry Duder | 1.459 | 2026-2031 | |
| 66 | Brendon Terry | 1.462 | 2017-2024 | |
| 67 | Alex Henderson | 1.463 | 2030-2035 | |
| 68 | Willie Ruest | 1.465 | 2032-2039 | |
| 69 | Tom McCord | 1.466 | 2035-2040 | |
| 69 | Michihiro Ohayashi | 1.466 | 2023-2035 | |
| 71 | David Merritt | 1.467 | 2017-2024 | |
| 72 | Taro Kouyama | 1.469 | 2014-2020 | |
| 73 | Yasuyuki Kato# | 1.471 | 2032-2042 | |
| 74 | Eugene Coleman | 1.475 | 2020-2027 | |
| 75 | Tadakuni Oshima | 1.476 | 2030-2038 | |
| 76 | Yoshihide Koike | 1.477 | 2020-2029 | |
| 77 | Jorge Ramos | 1.479 | 2031-2039 | |
| 77 | Jude Morrison | 1.479 | 2018-2024 | |
| 79 | Renaud Caruso | 1.487 | 2020-2036 | |
| 80 | Masahiro Shimizu | 1.489 | 2022-2033 | |
| 81 | Daniel Silva | 1.493 | 2022-2026 | |
| 82 | Josh Kern | 1.501 | 2032-2035 | |
| 83 | Alonso García# | 1.502 | 2037-2043 | |
| 84 | Takeji Higuchi# | 1.503 | 2033-2042 | |
| 85 | Shintaro Endo# | 1.507 | 2031-2040 | |
| 86 | José Herrera | 1.517 | 2025-2033 | |
| 86 | Ray Jeffery | 1.517 | 2033-2038 | |
| 86 | Merrill Steiner | 1.517 | 2034-2039 | |
| 89 | Kyuso Nakamura | 1.520 | 2027-2036 | |
| 90 | Bennie Rivers | 1.530 | 2020-2031 | |
| 91 | Davis Harrington | 1.537 | 2028-2036 | |
| 92 | Rocco Mazeri | 1.542 | 2020-2028 | |
| 93 | Hirotaka Ayugai | 1.550 | 2029-2035 | |
| 94 | Wes Laybolt | 1.560 | 2027-2038 | |
| 94 | Dan Bertrand | 1.560 | 2018-2026 | |
| 96 | Blair Redmond | 1.561 | 2030-2038 | |
| 97 | Yasushi Mochizuki# | 1.564 | 2029-2043 | |
| 98 | Justin Marshall | 1.565 | 2021-2028 | |
| 98 | Hunter Boyd | 1.565 | 2017-2025 | |
| 100 | Millard Mitchell# | 1.569 | 2029-2040 |
