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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | H9 | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Aroldis Chapman# | 6.31 | 2011-2025 | |
| 2 | Craig Kimbrel# | 6.40 | 2011-2025 | |
| 3 | Edwin Diaz# | 6.52 | 2017-2025 | |
| 4 | Sandy Koufax | 6.79 | 1955-1966 | |
| 5 | Kenley Jansen# | 6.84 | 2012-2025 | |
| 6 | David Robertson# | 7.11 | 2010-2025 | |
| 7 | Freddy Peralta# | 7.12 | 2019-2025 | |
| 8 | Joe Nathan | 7.21 | 2000-2016 | |
| 9 | Sean Doolittle | 7.22 | 2011-2022 | |
| 10 | Shane McClanahan# | 7.27 | 2023-2025 | |
| 11 | Lance McCullers Jr.# | 7.35 | 2016-2025 | |
| 12 | Max Scherzer# | 7.42 | 2009-2025 | |
| 13 | Jonathan Broxton | 7.47 | 2007-2017 | |
| 13 | Andrew Miller | 7.47 | 2007-2020 | |
| 13 | Smith Smith | 7.47 | 2002-2018 | |
| 16 | Ryan Pressly# | 7.51 | 2016-2025 | |
| 17 | Steve Hamilton | 7.55 | 1961-1972 | |
| 18 | Catfish Hunter | 7.58 | 1965-1976 | |
| 19 | Yu Darvish# | 7.59 | 2012-2025 | |
| 20 | Adam Ottavino# | 7.61 | 2010-2024 | |
| 21 | Dylan Cease# | 7.62 | 2015-2025 | |
| 22 | Darren O'Day | 7.65 | 2010-2022 | |
| 23 | Oliver Perez | 7.67 | 2003-2022 | |
| 23 | Trevor Bauer | 7.67 | 2012-2023 | |
| 23 | Julio Urias# | 7.67 | 2018-2025 | |
| 26 | Shohei Ohtani# | 7.68 | 2018-2025 | |
| 27 | Shawn Kelley | 7.69 | 2010-2020 | |
| 28 | Francisco Rodriguez | 7.70 | 2003-2018 | |
| 29 | Trevor Rosenthal | 7.72 | 2010-2023 | |
| 30 | Lucas Giolito# | 7.75 | 2016-2025 | |
| 30 | Jason Grilli | 7.75 | 2001-2017 | |
| 32 | Huston Street | 7.78 | 2005-2016 | |
| 33 | Corbin Burnes# | 7.79 | 2020-2025 | |
| 34 | Raisel Iglesias# | 7.84 | 2016-2025 | |
| 35 | Caleb Ferguson# | 7.85 | 2015-2025 | |
| 35 | Brandon Maurer | 7.85 | 2010-2018 | |
| 35 | Bryse Wilson# | 7.85 | 2020-2025 | |
| 35 | Stephen Strasburg# | 7.85 | 2010-2025 | |
| 39 | Tyler Clippard | 7.87 | 2007-2019 | |
| 40 | Danny Salazar | 7.88 | 2010-2021 | |
| 41 | Jeurys Familia | 7.89 | 2010-2022 | |
| 42 | Jonathan Papelbon | 7.91 | 2006-2017 | |
| 43 | Brandon Woodruff# | 7.92 | 2015-2025 | |
| 43 | J.P. Howell | 7.92 | 2008-2017 | |
| 45 | Steve Cishek | 7.93 | 2012-2021 | |
| 45 | Blake Snell# | 7.93 | 2012-2025 | |
| 47 | Shane Bieber# | 7.94 | 2020-2025 | |
| 48 | Casey Janssen | 7.95 | 2007-2016 | |
| 49 | Luke Gregerson | 7.96 | 2010-2019 | |
| 49 | Rafael Soriano | 7.96 | 2003-2015 | |
| 49 | Robbie Ray# | 7.96 | 2017-2025 | |
| 52 | Brad Peacock | 7.97 | 2010-2021 | |
| 53 | Tarik Skubal# | 7.99 | 2022-2025 | |
| 53 | Jose De Leon# | 7.99 | 2017-2022 | |
| 55 | Jacob Degrom# | 8.00 | 2012-2025 | |
| 55 | Triston McKenzie# | 8.00 | 2021-2025 | |
| 57 | Jake McGee | 8.02 | 2010-2022 | |
| 58 | Clayton Kershaw# | 8.04 | 2009-2025 | |
| 59 | Walker Buehler# | 8.05 | 2019-2025 | |
| 60 | Pedro Strop | 8.08 | 2011-2021 | |
| 61 | Evan Scribner | 8.09 | 2011-2018 | |
| 61 | Matt Harvey | 8.09 | 2014-2021 | |
| 63 | Bill Stafford | 8.10 | 1960-1967 | |
| 64 | Luis Castillo# | 8.11 | 2020-2025 | |
| 64 | Jesse Crain | 8.11 | 2006-2015 | |
| 66 | Chris Sale# | 8.12 | 2011-2025 | |
| 67 | Tanner Houck# | 8.13 | 2021-2025 | |
| 67 | Oliver Drake | 8.13 | 2010-2022 | |
| 69 | Pablo Lopez# | 8.15 | 2021-2025 | |
| 70 | Hector Rondon | 8.16 | 2010-2021 | |
| 71 | Sergio Romo | 8.18 | 2010-2021 | |
| 71 | Wade Davis | 8.18 | 2009-2020 | |
| 73 | Tyler Glasnow# | 8.19 | 2017-2025 | |
| 73 | Carlos Rodon# | 8.19 | 2015-2025 | |
| 73 | Sean Newcomb# | 8.19 | 2015-2024 | |
| 76 | Justin Steele# | 8.20 | 2015-2025 | |
| 76 | Larry Dierker | 8.20 | 1964-1976 | |
| 78 | Eduardo Rodriguez# | 8.21 | 2012-2025 | |
| 79 | David Price | 8.22 | 2009-2023 | |
| 79 | Jose Alvarez | 8.22 | 2010-2023 | |
| 79 | Zac Gallen# | 8.22 | 2020-2025 | |
| 79 | Michael Lorenzen# | 8.22 | 2018-2025 | |
| 79 | Joel Peralta | 8.22 | 2005-2016 | |
| 84 | Wilmer Font | 8.23 | 2010-2020 | |
| 84 | Felix Hernandez | 8.23 | 2005-2021 | |
| 86 | Chris Archer | 8.24 | 2012-2023 | |
| 87 | Mark Melancon | 8.25 | 2010-2023 | |
| 87 | Aaron Nola# | 8.25 | 2015-2025 | |
| 89 | Justin Verlander# | 8.27 | 2007-2025 | |
| 90 | Michael Fulmer# | 8.31 | 2012-2025 | |
| 91 | Gerrit Cole# | 8.34 | 2012-2025 | |
| 92 | Bob Feller | 8.35 | 1947-1956 | |
| 92 | Brandon Morrow | 8.35 | 2009-2020 | |
| 92 | Liam Hendriks# | 8.35 | 2012-2025 | |
| 95 | Jesse Chavez# | 8.37 | 2010-2025 | |
| 96 | Zach McAllister | 8.38 | 2012-2019 | |
| 96 | Joakim Soria | 8.38 | 2007-2020 | |
| 98 | Chad Billingsley | 8.39 | 2007-2015 | |
| 98 | Tanner Scheppers | 8.39 | 2010-2016 | |
| 98 | Tony Watson | 8.39 | 2011-2021 |
