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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 | Max Grant | 1.14 | 2019-2034 | |
| 4 | Sam Hatt | 1.15 | 2021-2022 | |
| 5 | David White | 1.21 | 2015-2023 | |
| 6 | Dave McCrudden | 1.23 | 2036-2037 | |
| 7 | Tom Collins | 1.25 | 2017-2026 | |
| 8 | Héctor González | 1.26 | 2030-2041 | |
| 9 | Kyle Taylor# | 1.30 | 2054-2057 | |
| 10 | Alfredo Tirado# | 1.32 | 2050-2053 | |
| 11 | Fei-hsien Xun | 1.34 | 2043-2046 | |
| 12 | Matt Nolan | 1.43 | 2028-2034 | |
| 13 | Grant Huffman | 1.45 | 2032-2035 | |
| 14 | Dave Pinkley | 1.63 | 2040-2043 | |
| 15 | Mehmood Dar | 1.69 | 2020-2021 | |
| 16 | Jayakar Ramadin | 1.88 | 2020-2028 | |
| 17 | Edwin Avila | 2.18 | 2040-2041 |
