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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Shane Watson | 0.76 | 2016 | |
| 2 | Charlie Shirek | 0.89 | 2014 | |
| 3 | Jesse Beal | 0.93 | 2016 | |
| 4 | Matt Sauer# | 1.00 | 2022 | |
| 5 | Eury Perez# | 1.04 | 2023 | |
| 6 | John Stilson | 1.05 | 2013 | |
| 7 | Donn Roach | 1.12 | 2015 | |
| 7 | Casey Bloomquist | 1.12 | 2016 | |
| 9 | Cal Quantrill# | 1.14 | 2018 | |
| 10 | Trey Ball | 1.16 | 2016 | |
| 11 | Josh Prevost | 1.17 | 2017 | |
| 12 | Matt Crouse | 1.19 | 2015 | |
| 13 | Sean Harney# | 1.23 | 2024 | |
| 14 | Ricky DeVito# | 1.24 | 2022 | |
| 15 | Bryce Bandilla | 1.33 | 2014 | |
| 16 | Bryce Hubbart# | 1.35 | 2026 | |
| 17 | Paul Demny | 1.40 | 2016 | |
| 17 | Mike Clevinger# | 1.40 | 2015 | |
| 19 | Anthony Solometo# | 1.41 | 2024 | |
| 20 | Nicholas Tepesch | 1.47 | 2013 | |
| 20 | Bryan Hudson# | 1.47 | 2019 | |
| 22 | Dan Reynolds | 1.50 | 2015 | |
| 22 | Griff McGarry# | 1.50 | 2023 | |
| 24 | Zach McCambley# | 1.63 | 2023 | |
| 25 | Luis Ysla | 1.67 | 2015 | |
| 26 | Joe Ross# | 1.79 | 2014 | |
| 27 | Jake Wong# | 1.89 | 2021 | |
| 28 | Rhett Kouba# | 1.93 | 2026 |
