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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Randy Hamilton | 0.95 | 2015-2015 | |
| 2 | Ramón Gómez# | 1.11 | 2023-2032 | |
| 3 | Seong-rae An# | 1.12 | 2026-2033 | |
| 4 | Max Grant# | 1.14 | 2019-2021 | |
| 5 | Sam Hatt | 1.15 | 2021-2022 | |
| 6 | David White | 1.21 | 2015-2023 | |
| 7 | Tom Collins | 1.25 | 2017-2026 | |
| 8 | Felipe Moreno | 1.32 | 2021-2028 | |
| 9 | José Contreras | 1.33 | 2014-2020 | |
| 10 | Frank Cronshaw# | 1.37 | 2020-2027 | |
| 11 | Douglas Pantall# | 1.46 | 2028-2033 | |
| 12 | Grant Huffman# | 1.50 | 2032-2033 | |
| 13 | Jason Atkinson | 1.51 | 2023-2026 | |
| 14 | David Bryan | 1.65 | 2012-2025 | |
| 15 | Mehmood Dar# | 1.69 | 2020-2021 | |
| 16 | James Stevens# | 1.79 | 2032-2033 | |
| 17 | George Clay | 1.80 | 2016-2024 | |
| 18 | Jayakar Ramadin | 1.88 | 2020-2028 |
