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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Luke Weaver# | 0.95 | 2021 | |
| 2 | Tyler Alexander# | 0.98 | 2024 | |
| 3 | Corbin Martin# | 1.00 | 2019 | |
| 4 | Maximo Castillo# | 1.07 | 2023 | |
| 5 | Brett Cecil | 1.12 | 2013 | |
| 6 | Gabriel Ynoa | 1.14 | 2017 | |
| 7 | Brian Flynn | 1.15 | 2014 | |
| 8 | Paolo Espino# | 1.22 | 2017 | |
| 8 | David Peterson# | 1.22 | 2020 | |
| 10 | Mike Vinson | 1.24 | 2016 | |
| 11 | Collin Wiles# | 1.27 | 2023 | |
| 12 | Emerson Hancock# | 1.28 | 2023 | |
| 13 | Manny Banuelos# | 1.29 | 2014 | |
| 14 | Jordan Lyles# | 1.30 | 2017 | |
| 15 | Austen Williams | 1.34 | 2020 | |
| 16 | Rubby de la Rosa# | 1.37 | 2014 | |
| 17 | Tobias Myers# | 1.39 | 2024 | |
| 18 | Cody Morris# | 1.41 | 2023 | |
| 19 | Osvaldo Bido# | 1.42 | 2024 | |
| 20 | Brent Honeywell Jr.# | 1.44 | 2019 | |
| 21 | Brooks Raley# | 1.45 | 2016 | |
| 21 | Randall Delgado | 1.45 | 2013 | |
| 23 | John Gast | 1.47 | 2017 | |
| 23 | Jack Patterson | 1.47 | 2020 | |
| 25 | Jose Alvarez | 1.50 | 2014 | |
| 25 | Jakob Junis# | 1.50 | 2024 | |
| 27 | Jack Flaherty# | 1.56 | 2018 | |
| 28 | Alex Cobb# | 1.65 | 2013 | |
| 28 | Jesse Biddle | 1.65 | 2015 | |
| 30 | Brian Matusz | 1.67 | 2013 | |
| 31 | Brady Rodgers | 1.71 | 2017 | |
| 32 | Nathan Eovaldi# | 1.84 | 2013 | |
| 33 | Nicholas Kingham | 1.98 | 2015 | |
| 33 | T.J. House | 1.98 | 2017 | |
| 35 | Nick Travieso | 2.11 | 2016 | |
| 36 | Jarred Cosart | 2.26 | 2013 |
