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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Joe Robinson | 0.56 | 2017 | |
| 1 | Adam Fedchenko | 0.56 | 2036 | |
| 3 | Luis Leyva | 0.62 | 2015 | |
| 4 | Raúl Medine | 0.66 | 2037 | |
| 5 | Jorge Perales | 0.75 | 2012 | |
| 6 | Todd Brown# | 0.78 | 2037 | |
| 7 | Michael Curtis# | 0.80 | 2049 | |
| 8 | Dorian Mack# | 0.81 | 2040 | |
| 9 | Bill Spracklin | 0.82 | 2035 | |
| 10 | Bob MacKinley | 0.83 | 2043 | |
| 11 | Júlio Caraballo | 0.84 | 2033 | |
| 12 | Brian Sweet | 0.85 | 2035 | |
| 13 | Michael Calhoun | 0.87 | 2045 | |
| 14 | Horiuchi Morishita | 0.88 | 2013 | |
| 14 | Ryoichi Endo# | 0.88 | 2048 | |
| 16 | Alfredo Fernández | 0.92 | 2016 | |
| 17 | David Franklin | 0.93 | 2032 | |
| 17 | Michael Calhoun | 0.93 | 2046 | |
| 17 | Jim Miller | 0.93 | 2032 | |
| 20 | Fernando Márquez | 0.95 | 2035 | |
| 21 | Luis Leyva | 0.98 | 2016 | |
| 21 | Artie Jackson | 0.98 | 2032 | |
| 21 | Toby Adams | 0.98 | 2044 | |
| 24 | Michael Calhoun | 1.00 | 2047 | |
| 25 | Randolph Hutchison | 1.01 | 2019 | |
| 26 | Nick Coomer | 1.02 | 2033 | |
| 27 | Takeichi Koike | 1.03 | 2017 | |
| 27 | Rory Taverner | 1.03 | 2024 | |
| 29 | Michael Calhoun | 1.04 | 2044 | |
| 30 | Greg Bailey | 1.05 | 2023 | |
| 31 | Matt Miller | 1.06 | 2015 | |
| 31 | Nakamaro Abe# | 1.06 | 2050 | |
| 33 | Tim Stone# | 1.07 | 2049 | |
| 33 | Dave Turner | 1.07 | 2012 | |
| 35 | Jarred Benson | 1.13 | 2039 | |
| 36 | Jorge Gómez | 1.14 | 2038 | |
| 36 | Doug Roberts | 1.14 | 2013 | |
| 38 | Brian Hankins | 1.15 | 2034 | |
| 39 | César Esparza# | 1.16 | 2049 | |
| 40 | Felipe Pérez | 1.17 | 2034 | |
| 40 | Ned Clark | 1.17 | 2016 | |
| 42 | David White | 1.18 | 2029 | |
| 42 | P.J. Woodard | 1.18 | 2017 | |
| 44 | Mike Dwyer | 1.19 | 2025 | |
| 45 | Bubba McCall# | 1.22 | 2049 | |
| 45 | Tomokazu Kamida | 1.22 | 2019 | |
| 47 | Elias Rose | 1.23 | 2018 | |
| 48 | Diego López | 1.25 | 2024 | |
| 49 | Juan Varela* | 1.27 | 2023 | |
| 49 | Bernardo De Jesús# | 1.27 | 2047 | |
| 51 | Alberto Gómez | 1.30 | 2015 | |
| 51 | Bill Davis | 1.30 | 2037 | |
| 53 | Craig Stewart | 1.31 | 2040 | |
| 54 | William Young | 1.32 | 2021 | |
| 54 | Wilbert Sutton | 1.32 | 2032 | |
| 56 | Jack Sandford | 1.34 | 2031 | |
| 57 | Bill Tucker | 1.38 | 2029 | |
| 58 | Ernesto González | 1.40 | 2040 | |
| 58 | Jarred Benson | 1.40 | 2041 | |
| 60 | Dave Beauchamp# | 1.42 | 2050 | |
| 60 | Félix Mendoza | 1.42 | 2049 | |
| 62 | Ignacio Rivera | 1.43 | 2041 | |
| 63 | Will Lester | 1.46 | 2022 | |
| 64 | Bob Collins | 1.47 | 2017 | |
| 65 | Hunter Richardson | 1.50 | 2026 | |
| 66 | Raúl Morán | 1.53 | 2038 | |
| 66 | Juan Leyva# | 1.53 | 2050 | |
| 66 | Brian Vaughan | 1.53 | 2026 | |
| 69 | Ken Russell* | 1.56 | 2022 | |
| 69 | Doug Grimes | 1.56 | 2027 | |
| 71 | Miguel Martínez | 1.60 | 2019 | |
| 72 | Chris Hopkins | 1.65 | 2022 | |
| 73 | Jacob Foster | 1.74 | 2028 | |
| 74 | Duane Carter | 1.75 | 2025 | |
| 75 | Grant Love | 1.77 | 2020 | |
| 76 | Frank Heap# | 1.89 | 2047 | |
| 77 | Robert Collard | 2.11 | 2029 |
