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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Chris Martin# | 1.04 | 2016 | |
| 2 | Nathan Wiles# | 1.27 | 2023 | |
| 3 | Jordan Yamamoto# | 1.33 | 2021 | |
| 4 | Luis Ortiz# | 1.44 | 2018 | |
| 5 | Blake Treinen# | 1.47 | 2015 | |
| 5 | Kyle Crick# | 1.47 | 2016 | |
| 7 | Jameson Taillon# | 1.50 | 2013 | |
| 8 | Percy Garner | 1.54 | 2014 | |
| 9 | Barret Loux | 1.58 | 2015 | |
| 10 | Andre Jackson# | 1.60 | 2023 | |
| 10 | Jean Pinto# | 1.60 | 2024 | |
| 12 | Jason Hursh | 1.71 | 2015 | |
| 13 | Donn Roach | 1.78 | 2014 | |
| 14 | Tanner Burns# | 1.88 | 2024 | |
| 15 | Misael Siverio | 2.00 | 2016 | |
| 16 | Eric Berger | 2.07 | 2014 | |
| 17 | Sean Nolin | 2.40 | 2013 |
