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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Casey Kelly# | 0.78 | 2021 | |
| 2 | David Buchanan# | 0.84 | 2021 | |
| 3 | Luis Perdomo# | 0.98 | 2017 | |
| 4 | Roberto Perez | 1.00 | 2017 | |
| 5 | Jhony Brito# | 1.02 | 2024 | |
| 6 | Josh James# | 1.09 | 2020 | |
| 7 | Alex Meyer | 1.10 | 2014 | |
| 8 | Carlos Rodon# | 1.16 | 2016 | |
| 9 | Julio Teheran | 1.17 | 2013 | |
| 9 | Carlos Rodon# | 1.17 | 2017 | |
| 9 | Danny Salazar | 1.17 | 2014 | |
| 12 | Madison Bumgarner | 1.21 | 2013 | |
| 13 | Robbie Erlin# | 1.29 | 2014 | |
| 14 | Austin Pruitt# | 1.33 | 2021 | |
| 15 | Anthony DeSclafani# | 1.36 | 2016 | |
| 16 | Miguel A. Gonzalez | 1.39 | 2014 | |
| 16 | Miguel A. Gonzalez | 1.39 | 2016 | |
| 18 | Grayson Long | 1.44 | 2018 | |
| 19 | Jeremy Hefner | 1.48 | 2013 | |
| 20 | Clay Buchholz | 1.63 | 2013 | |
| 21 | Ryne Nelson# | 1.69 | 2023 | |
| 22 | Jake Thompson | 1.73 | 2020 |
