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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Monzaemon Nakashima# | 0.46 | 2032-2032 | |
| 2 | Henry Cluett# | 0.67 | 2029-2030 | |
| 3 | Alfredo Reyes | 0.83 | 2027-2036 | |
| 4 | Tsurayuki Harada# | 0.84 | 2029-2040 | |
| 4 | Sebastiaan de Roode# | 0.84 | 2032-2033 | |
| 6 | Domingo Vázquez | 0.85 | 2027-2036 | |
| 6 | Fernando García | 0.85 | 2032-2035 | |
| 8 | Lou Butler# | 0.86 | 2029-2040 | |
| 8 | René Padilla# | 0.86 | 2034-2034 | |
| 10 | Joe Russell# | 0.91 | 2028-2037 | |
| 11 | Arlen Badger# | 0.94 | 2027-2039 | |
| 12 | José Flores# | 0.96 | 2034-2034 | |
| 12 | Erik Watson | 0.96 | 2024-2039 | |
| 14 | Armando Sánchez# | 0.97 | 2036-2036 | |
| 15 | Roberto Ruíz# | 0.98 | 2034-2036 | |
| 15 | Huibrecht Ubbens | 0.98 | 2032-2036 | |
| 17 | Skip Hathaway# | 0.99 | 2033-2036 | |
| 17 | León Vallés | 0.99 | 2009-2013 | |
| 17 | Eisuke Sanu | 0.99 | 2020-2023 | |
| 20 | Seiichi Sakaguchi# | 1.04 | 2032-2033 | |
| 20 | Barney Swanson# | 1.04 | 2027-2038 | |
| 22 | Adam Pemberton# | 1.05 | 2027-2040 | |
| 23 | Barney Stone# | 1.09 | 2028-2038 | |
| 24 | Félix Córdova | 1.12 | 2023-2035 | |
| 25 | Kikaku Suzuki | 1.13 | 2022-2030 | |
| 25 | Brock Barrett | 1.13 | 2012-2025 | |
| 25 | Emílio Martínez# | 1.13 | 2032-2040 | |
| 28 | Donald Lesher# | 1.14 | 2028-2033 | |
| 29 | Dean Makepeace# | 1.15 | 2032-2033 | |
| 29 | Luis Cavazos# | 1.15 | 2035-2036 | |
| 31 | Andrew Burns | 1.16 | 2021-2033 | |
| 31 | Alfredo Zambrano | 1.16 | 2023-2025 | |
| 33 | Marcel Osterhout# | 1.17 | 2029-2040 | |
| 34 | Robinson Hernández# | 1.19 | 2028-2038 | |
| 34 | Pedro Torres# | 1.19 | 2027-2040 | |
| 34 | Marcos Alcorta | 1.19 | 2025-2030 | |
| 34 | Jim Fish | 1.19 | 2024-2037 | |
| 34 | Trey Calder# | 1.19 | 2031-2037 | |
| 39 | Barney Stevens | 1.20 | 2027-2035 | |
| 40 | Héctor Ventura# | 1.21 | 2033-2035 | |
| 41 | Luis Miguel Freitas# | 1.25 | 2035-2040 | |
| 42 | Pasquale Richelmi# | 1.26 | 2035-2039 | |
| 42 | Min-zhong Lou# | 1.26 | 2034-2035 | |
| 44 | Izumo Kondo | 1.29 | 2025-2031 | |
| 44 | Robbie Dupuis# | 1.29 | 2028-2040 | |
| 46 | Jorge Flores# | 1.31 | 2033-2034 | |
| 47 | Tadakuni Suzuki | 1.35 | 2024-2037 | |
| 47 | Alonso González# | 1.35 | 2034-2040 | |
| 49 | Seong-chae Somun# | 1.36 | 2029-2039 | |
| 50 | Jin-hyun Park# | 1.41 | 2026-2039 | |
| 50 | Lúcio Saldaña# | 1.41 | 2035-2039 | |
| 52 | Fernando Castro# | 1.43 | 2021-2039 | |
| 52 | Kitahachi Noda# | 1.43 | 2024-2040 | |
| 54 | Felipe Aguilera# | 1.47 | 2037-2040 | |
| 55 | Frank Ridell# | 1.48 | 2030-2035 | |
| 56 | Juan Jose Patino | 1.50 | 2024-2038 | |
| 57 | Darryl McClendon | 1.63 | 2017-2022 |
