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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | H9 | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Craig Kimbrel# | 6.15 | 2011-2023 | |
| 2 | Aroldis Chapman# | 6.20 | 2011-2023 | |
| 3 | Ken Giles# | 6.26 | 2015-2023 | |
| 4 | Jake Diekman# | 6.71 | 2010-2023 | |
| 5 | Kenley Jansen# | 6.75 | 2012-2023 | |
| 6 | Sandy Koufax | 6.79 | 1955-1966 | |
| 7 | David Robertson# | 7.11 | 2010-2023 | |
| 8 | Freddy Peralta# | 7.12 | 2019-2023 | |
| 9 | Vince Velasquez# | 7.17 | 2016-2022 | |
| 10 | Joe Nathan | 7.21 | 2000-2016 | |
| 11 | Sean Doolittle# | 7.22 | 2011-2022 | |
| 12 | Lance McCullers Jr.# | 7.28 | 2016-2023 | |
| 13 | Max Scherzer# | 7.36 | 2009-2023 | |
| 14 | Robbie Ray# | 7.47 | 2017-2023 | |
| 14 | Jonathan Broxton | 7.47 | 2007-2017 | |
| 14 | Andrew Miller | 7.47 | 2007-2020 | |
| 14 | Smith Smith | 7.47 | 2002-2018 | |
| 18 | Yu Darvish# | 7.50 | 2012-2023 | |
| 19 | Shohei Ohtani# | 7.53 | 2018-2023 | |
| 20 | Steve Hamilton | 7.55 | 1961-1972 | |
| 21 | Catfish Hunter | 7.58 | 1965-1976 | |
| 22 | Lucas Giolito# | 7.59 | 2016-2023 | |
| 23 | Darren O'Day# | 7.65 | 2010-2022 | |
| 24 | Walker Buehler# | 7.66 | 2019-2023 | |
| 25 | Oliver Perez | 7.67 | 2003-2022 | |
| 25 | Trevor Bauer# | 7.67 | 2012-2023 | |
| 27 | Shawn Kelley | 7.69 | 2010-2020 | |
| 28 | Francisco Rodriguez | 7.70 | 2003-2018 | |
| 29 | Stephen Strasburg# | 7.72 | 2010-2023 | |
| 29 | Trevor Rosenthal# | 7.72 | 2010-2023 | |
| 31 | Jason Grilli | 7.75 | 2001-2017 | |
| 32 | Brandon Woodruff# | 7.76 | 2015-2023 | |
| 33 | Huston Street | 7.78 | 2005-2016 | |
| 34 | Julio Urias# | 7.79 | 2018-2023 | |
| 35 | Brandon Maurer | 7.85 | 2010-2018 | |
| 36 | Tyler Clippard | 7.87 | 2007-2019 | |
| 37 | Danny Salazar | 7.88 | 2010-2021 | |
| 37 | Zack Britton# | 7.88 | 2011-2023 | |
| 39 | Daniel Hudson# | 7.89 | 2011-2023 | |
| 39 | Jeurys Familia | 7.89 | 2010-2022 | |
| 41 | Clayton Kershaw# | 7.90 | 2009-2023 | |
| 42 | Jonathan Papelbon | 7.91 | 2006-2017 | |
| 43 | J.P. Howell | 7.92 | 2008-2017 | |
| 44 | Steve Cishek | 7.93 | 2012-2021 | |
| 45 | Corbin Burnes# | 7.94 | 2020-2023 | |
| 46 | Casey Janssen | 7.95 | 2007-2016 | |
| 47 | Luke Gregerson | 7.96 | 2010-2019 | |
| 47 | Rafael Soriano | 7.96 | 2003-2015 | |
| 49 | Brad Peacock | 7.97 | 2010-2021 | |
| 50 | Raisel Iglesias# | 7.99 | 2016-2023 | |
| 50 | Dylan Cease# | 7.99 | 2015-2023 | |
| 50 | Jose De Leon# | 7.99 | 2017-2022 | |
| 53 | Jake McGee | 8.02 | 2010-2022 | |
| 54 | Noah Syndergaard# | 8.03 | 2016-2023 | |
| 55 | Chris Sale# | 8.07 | 2011-2023 | |
| 56 | Pedro Strop | 8.08 | 2011-2021 | |
| 57 | Evan Scribner | 8.09 | 2011-2018 | |
| 57 | Matt Harvey | 8.09 | 2014-2021 | |
| 59 | Gerrit Cole# | 8.10 | 2012-2023 | |
| 59 | Bill Stafford | 8.10 | 1960-1967 | |
| 59 | Blake Snell# | 8.10 | 2012-2023 | |
| 59 | Adam Ottavino# | 8.10 | 2010-2023 | |
| 63 | Jesse Crain | 8.11 | 2006-2015 | |
| 64 | Mitch Keller# | 8.12 | 2015-2023 | |
| 65 | Oliver Drake | 8.13 | 2010-2022 | |
| 66 | Hector Rondon | 8.16 | 2010-2021 | |
| 67 | Sergio Romo | 8.18 | 2010-2021 | |
| 67 | Wade Davis | 8.18 | 2009-2020 | |
| 69 | Tyler Glasnow# | 8.20 | 2017-2023 | |
| 69 | Larry Dierker | 8.20 | 1964-1976 | |
| 69 | Trevor May# | 8.20 | 2010-2023 | |
| 72 | Jacob Degrom# | 8.21 | 2012-2023 | |
| 73 | David Price# | 8.22 | 2009-2023 | |
| 73 | Jose Alvarez# | 8.22 | 2010-2023 | |
| 73 | Luis Castillo# | 8.22 | 2020-2023 | |
| 73 | Joel Peralta | 8.22 | 2005-2016 | |
| 77 | Wilmer Font# | 8.23 | 2010-2020 | |
| 77 | Felix Hernandez | 8.23 | 2005-2021 | |
| 77 | Eduardo Rodriguez# | 8.23 | 2012-2023 | |
| 80 | Luis Severino# | 8.24 | 2016-2023 | |
| 80 | Justin Verlander# | 8.24 | 2007-2023 | |
| 80 | Chris Archer | 8.24 | 2012-2023 | |
| 83 | Mark Melancon# | 8.25 | 2010-2023 | |
| 83 | Carlos Rodon# | 8.25 | 2015-2023 | |
| 85 | Max Fried# | 8.28 | 2018-2023 | |
| 86 | Michael Clevinger# | 8.34 | 2016-2023 | |
| 87 | Bob Feller | 8.35 | 1947-1956 | |
| 87 | Brandon Morrow | 8.35 | 2009-2020 | |
| 89 | Sonny Gray# | 8.37 | 2012-2023 | |
| 90 | Aaron Nola# | 8.38 | 2015-2023 | |
| 90 | Zach McAllister | 8.38 | 2012-2019 | |
| 90 | Joakim Soria | 8.38 | 2007-2020 | |
| 93 | Chad Billingsley | 8.39 | 2007-2015 | |
| 93 | Tanner Scheppers | 8.39 | 2010-2016 | |
| 93 | Tony Watson | 8.39 | 2011-2021 | |
| 93 | Smith Smith | 8.39 | 2005-2014 | |
| 97 | Jake Peavy | 8.40 | 2002-2018 | |
| 97 | Alex Wood# | 8.40 | 2014-2023 | |
| 97 | Nick Pivetta# | 8.40 | 2019-2023 | |
| 100 | Billy O'Dell | 8.41 | 1954-1967 |
