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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Matt Purke | 0.64 | 2015 | |
| 2 | Jose Urena# | 0.85 | 2014 | |
| 3 | Dillon Peters# | 0.91 | 2023 | |
| 4 | Matt Canterino# | 1.04 | 2021 | |
| 5 | Eric Hacker | 1.08 | 2021 | |
| 6 | Jimmy Gillheeney | 1.18 | 2013 | |
| 7 | Chris Dwyer | 1.29 | 2014 | |
| 8 | Tyler Rogers# | 1.43 | 2016 | |
| 9 | Chad Kuhl# | 1.45 | 2024 | |
| 9 | Jackson Stephens# | 1.45 | 2015 | |
| 11 | Giovanni Soto | 1.47 | 2014 | |
| 11 | Sam Bachman# | 1.47 | 2023 | |
| 13 | James Marvel | 1.50 | 2021 | |
| 14 | Branden Kline | 1.55 | 2016 | |
| 15 | Conor Harber | 1.60 | 2021 | |
| 16 | Colin Rodgers | 1.83 | 2015 |
