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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Daniel Tiant | 0.33 | 2043 | |
| 2 | Luis Miguel Toledo | 0.76 | 2018 | |
| 3 | Adrien Clément* | 0.85 | 2012 | |
| 4 | Rick Hill | 0.88 | 2019 | |
| 5 | Daniel Tiant | 0.92 | 2044 | |
| 6 | Glenn Carty | 1.02 | 2044 | |
| 7 | Ju-ao Ru | 1.03 | 2027 | |
| 8 | Jacob Willard | 1.11 | 2021 | |
| 9 | Francisco Rolón | 1.14 | 2021 | |
| 10 | Enrique López | 1.19 | 2019 | |
| 11 | Bob Briggs | 1.22 | 2044 | |
| 11 | Hervé Muller | 1.22 | 2023 | |
| 13 | Arnaud Durand | 1.24 | 2023 | |
| 14 | Rick MacLellan | 1.31 | 2023 | |
| 15 | Chris Stone | 1.38 | 2018 | |
| 15 | Jason Walker | 1.38 | 2021 | |
| 17 | Iván Vázquez | 1.40 | 2022 | |
| 18 | James Thompson | 1.41 | 2021 | |
| 19 | Matis Barrier | 1.45 | 2025 | |
| 20 | Christian O'Leary | 1.48 | 2044 | |
| 21 | Bruce Easton | 1.61 | 2028 | |
| 22 | Joshua Goldberg | 1.80 | 2012 | |
| 23 | Elliott Rogers | 1.87 | 2021 | |
| 24 | Yannis Legrand | 1.88 | 2015 |
