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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Luis Miguel Toledo | 0.762 | 2018 | |
| 2 | Haden Nunn | 0.766 | 2026 | |
| 3 | Austin Covey | 0.840 | 2026 | |
| 4 | Adrien Clément | 0.847 | 2012 | |
| 5 | Pedro Salas | 0.879 | 2022 | |
| 6 | Dave Conboy# | 0.882 | 2025 | |
| 7 | Rick Hill | 0.885 | 2019 | |
| 8 | Carl Beck | 0.947 | 2020 | |
| 9 | Paco Ortega | 0.949 | 2022 | |
| 10 | Hugh Bowness | 0.982 | 2023 | |
| 11 | Ju-ao Ru# | 1.026 | 2027 | |
| 12 | Tomás Quiñonez | 1.034 | 2021 | |
| 13 | Joe Wamboldt# | 1.063 | 2027 | |
| 14 | Bryan Roland | 1.085 | 2025 | |
| 15 | Jacob Willard# | 1.113 | 2021 | |
| 16 | Hideyori Ohayashi | 1.133 | 2019 | |
| 17 | Francisco Rolón | 1.140 | 2021 | |
| 18 | Alain Laporte | 1.145 | 2017 | |
| 19 | Randy Owry | 1.149 | 2025 | |
| 20 | Enrique López | 1.189 | 2019 | |
| 21 | Tim Stady# | 1.200 | 2027 | |
| 21 | Artie Harris | 1.200 | 2020 | |
| 21 | Quincy Moss | 1.200 | 2025 | |
| 24 | Dallas Savage | 1.215 | 2018 | |
| 25 | Hervé Muller# | 1.222 | 2023 | |
| 26 | Arnaud Durand | 1.235 | 2023 | |
| 27 | Henry McGaughey | 1.268 | 2024 | |
| 28 | Duane Lummis# | 1.271 | 2026 | |
| 29 | Gabin Dubourg | 1.294 | 2026 | |
| 30 | Rick MacLellan# | 1.313 | 2023 | |
| 31 | Ross Batstone# | 1.339 | 2027 | |
| 32 | Chris Stone | 1.381 | 2018 | |
| 33 | Jason Walker# | 1.385 | 2021 | |
| 34 | Claude Fraysse | 1.400 | 2024 | |
| 35 | Iván Vázquez# | 1.404 | 2022 | |
| 36 | James Thompson# | 1.406 | 2021 | |
| 37 | Armando Hernández | 1.408 | 2019 | |
| 38 | Brian Lapointe# | 1.444 | 2023 | |
| 39 | Matis Barrier# | 1.452 | 2025 | |
| 40 | Scott Weatherby | 1.467 | 2016 | |
| 41 | Javier Ortíz | 1.531 | 2022 | |
| 42 | Clement Bowden# | 1.556 | 2029 | |
| 43 | Bruce Easton# | 1.607 | 2028 | |
| 44 | Tim Conway | 1.657 | 2020 | |
| 45 | Walker Hoekstra# | 1.667 | 2029 | |
| 46 | Tim St.george | 1.707 | 2028 | |
| 47 | Joël Meyer# | 1.755 | 2028 | |
| 48 | Joshua Goldberg | 1.800 | 2012 | |
| 49 | Elliott Rogers# | 1.868 | 2021 | |
| 50 | Yannis Legrand | 1.875 | 2015 |
