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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Ted Mills | 0.545 | 2012 | |
| 2 | Don Wheeler# | 0.655 | 2032 | |
| 3 | Ben Crabb# | 0.684 | 2031 | |
| 4 | Bobby Mannix# | 0.750 | 2028 | |
| 5 | Matsuyo Koda# | 0.792 | 2029 | |
| 6 | Jorge Rivera# | 0.800 | 2032 | |
| 7 | Mike Taylor# | 0.849 | 2026 | |
| 8 | John Cannon | 0.885 | 2017 | |
| 9 | Willi Kehr# | 0.941 | 2027 | |
| 10 | Charlie Bennett# | 0.960 | 2028 | |
| 11 | Nicolas Dupuis# | 0.980 | 2031 | |
| 12 | Arata Shimizu# | 0.981 | 2027 | |
| 13 | Ruberto Laranjeira | 0.987 | 2020 | |
| 14 | Don Wheeler# | 1.000 | 2031 | |
| 14 | Nick Nielsen | 1.000 | 2021 | |
| 14 | Felipe Arreola# | 1.000 | 2028 | |
| 14 | Jason Duncan# | 1.000 | 2025 | |
| 18 | Garland Akers | 1.023 | 2022 | |
| 19 | José Barrachina# | 1.041 | 2030 | |
| 20 | Ricardo Castros# | 1.102 | 2025 | |
| 21 | Jorge Vásquez | 1.109 | 2018 | |
| 22 | Yoshiaga Rin# | 1.111 | 2023 | |
| 23 | Willi Kehr# | 1.113 | 2028 | |
| 24 | Jake Robinson | 1.138 | 2018 | |
| 25 | Juan Pérez# | 1.163 | 2030 | |
| 26 | Juan Martínez# | 1.164 | 2029 | |
| 27 | Hyun-tae Hwan# | 1.176 | 2027 | |
| 28 | Xavier Gordon | 1.188 | 2017 | |
| 29 | Ramu Pavi | 1.208 | 2018 | |
| 30 | Jason Atkinson | 1.232 | 2022 | |
| 31 | Felipe Moreno | 1.235 | 2025 | |
| 32 | Robert Osborne | 1.240 | 2019 | |
| 33 | Tim Conway | 1.255 | 2021 | |
| 34 | Benny Hartley# | 1.277 | 2022 | |
| 35 | Pat McConnell# | 1.286 | 2026 | |
| 36 | George Clay | 1.302 | 2020 | |
| 37 | Daryl Harrison# | 1.316 | 2023 | |
| 37 | António Espinoza | 1.316 | 2026 | |
| 39 | Luis Olvera | 1.319 | 2018 | |
| 40 | Julian Fanner# | 1.320 | 2026 | |
| 41 | José Gómez# | 1.333 | 2032 | |
| 41 | Jeff Stephens# | 1.333 | 2032 | |
| 43 | Clifford Ferguson | 1.338 | 2017 | |
| 44 | Barrett Lamb# | 1.339 | 2031 | |
| 45 | Saiyid Mashwanis# | 1.358 | 2025 | |
| 46 | Hidetada Abe# | 1.397 | 2024 | |
| 47 | Lúcio Barrón# | 1.400 | 2032 | |
| 48 | Arnold Woods | 1.437 | 2017 | |
| 49 | Maurice Hesmondhalgh | 1.444 | 2021 | |
| 50 | Tamasaburo Kato# | 1.450 | 2027 | |
| 51 | Juan Martínez# | 1.452 | 2028 | |
| 52 | Mauro Rodríguez# | 1.467 | 2031 | |
| 53 | Ammar Isma'il | 1.500 | 2018 | |
| 53 | Marcos Marino# | 1.500 | 2024 | |
| 55 | Gabresilassie Cherono# | 1.565 | 2019 | |
| 56 | He-ping Wang# | 1.620 | 2021 | |
| 57 | Chance Richards | 1.623 | 2020 | |
| 58 | Luis Olvera | 1.684 | 2019 | |
| 59 | Shafeeq bin Nooh | 1.696 | 2021 | |
| 60 | Domingo Moreno# | 1.714 | 2021 | |
| 61 | Alex Barnaby | 1.750 | 2022 | |
| 62 | Seung-kab Ko | 2.022 | 2017 | |
| 63 | Ánibal Altichioro# | 2.038 | 2024 | |
| 64 | Orlando Días# | 2.267 | 2021 |
