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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | K9 | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Ryan Pepiot# | 10.13 | 2023 | |
| 2 | Ken Waldichuk# | 9.65 | 2022 | |
| 3 | Burch Smith | 9.18 | 2018 | |
| 4 | Burch Smith | 8.84 | 2016 | |
| 5 | Casey Crosby | 8.68 | 2015 | |
| 6 | Kyle Hurt# | 8.58 | 2024 | |
| 7 | Brent Honeywell Jr.# | 8.44 | 2018 | |
| 8 | Andy Oliver | 8.40 | 2015 | |
| 9 | Tyler Skaggs | 8.26 | 2015 | |
| 9 | Andy Oliver | 8.26 | 2014 | |
| 11 | Eury Perez# | 8.22 | 2024 | |
| 12 | Gerrit Cole# | 8.18 | 2014 | |
| 13 | Rob Kaminsky | 8.16 | 2022 | |
| 14 | Nabil Crismatt# | 8.09 | 2021 | |
| 15 | Reid Detmers# | 8.00 | 2023 | |
| 16 | Taylor Hearn# | 7.99 | 2025 | |
| 17 | Rubby de la Rosa# | 7.97 | 2014 | |
| 18 | Mitch White# | 7.90 | 2022 | |
| 19 | Buck Farmer# | 7.86 | 2018 | |
| 20 | Josh Hader# | 7.83 | 2017 | |
| 21 | Tyler Thornburg | 7.82 | 2015 | |
| 22 | Corey Kluber | 7.81 | 2014 | |
| 22 | Jose De Leon# | 7.81 | 2017 | |
| 24 | Daniel Wright | 7.80 | 2018 | |
| 25 | Riley Thompson# | 7.79 | 2025 | |
| 25 | Kenny Rosenberg# | 7.79 | 2025 | |
| 27 | Eduardo Rodriguez# | 7.70 | 2017 | |
| 28 | Luis Patino# | 7.67 | 2021 | |
| 29 | Brian Matusz | 7.62 | 2013 | |
| 29 | Robert Gasser# | 7.62 | 2024 | |
| 31 | Burch Smith | 7.60 | 2020 | |
| 32 | Ronel Blanco# | 7.53 | 2025 | |
| 33 | Jack Flaherty# | 7.50 | 2018 | |
| 34 | Tanner Andrews# | 7.49 | 2023 | |
| 35 | Kwang-hyun Kim# | 7.47 | 2025 | |
| 36 | Clayton Beeter# | 7.46 | 2025 | |
| 37 | Adam Ottavino# | 7.44 | 2009 | |
| 38 | Brandon Dickson | 7.38 | 2010 | |
| 38 | Luke Weaver# | 7.38 | 2021 | |
| 40 | Taijuan Walker# | 7.37 | 2017 | |
| 41 | Todd Redmond | 7.36 | 2016 | |
| 42 | Tanner Roark | 7.34 | 2022 | |
| 43 | August Schlosser | 7.33 | 2015 | |
| 44 | Dillon Overton | 7.32 | 2018 | |
| 45 | Josh Tomlin | 7.31 | 2014 | |
| 46 | A.J. Griffin | 7.30 | 2013 | |
| 47 | Burch Smith | 7.25 | 2017 | |
| 48 | Cole Ragans# | 7.24 | 2023 | |
| 49 | Brock Burke# | 7.22 | 2022 | |
| 50 | Jose Alvarez | 7.20 | 2014 | |
| 51 | Burch Smith | 7.18 | 2021 | |
| 52 | Roenis Elias | 7.16 | 2017 | |
| 52 | August Schlosser | 7.16 | 2016 | |
| 54 | Angel Rondon# | 7.15 | 2025 | |
| 54 | Zac Lowther# | 7.15 | 2021 | |
| 56 | Lucas Harrell | 7.13 | 2015 | |
| 57 | Trevor Cahill | 7.12 | 2016 | |
| 58 | Sixto Sanchez# | 7.10 | 2025 | |
| 59 | Jesse Scholtens# | 7.07 | 2022 | |
| 60 | Nicholas Kingham | 7.06 | 2015 | |
| 61 | Rich Hill# | 7.05 | 2024 | |
| 62 | Casey Kelly# | 7.04 | 2013 | |
| 63 | Nathan Eovaldi# | 7.02 | 2013 | |
| 64 | Randy Vasquez# | 6.99 | 2024 | |
| 65 | Connor Loeprich# | 6.98 | 2025 | |
| 66 | Edward Cabrera# | 6.97 | 2024 | |
| 66 | Chris Murphy# | 6.97 | 2025 | |
| 68 | Tanner Bibee# | 6.92 | 2023 | |
| 69 | Alfredo Simon | 6.91 | 2014 | |
| 70 | Chase Silseth# | 6.89 | 2025 | |
| 70 | Nathan Eovaldi# | 6.89 | 2015 | |
| 70 | Paolo Espino# | 6.89 | 2017 | |
| 73 | Bryan Woo# | 6.88 | 2024 | |
| 74 | Phil Irwin | 6.84 | 2015 | |
| 75 | Colton Gordon# | 6.82 | 2024 | |
| 76 | Jacob Nix# | 6.81 | 2022 | |
| 77 | Rudy Owens | 6.80 | 2014 | |
| 78 | Ronel Blanco# | 6.78 | 2024 | |
| 79 | Alex Cobb# | 6.75 | 2013 | |
| 80 | Allen Webster | 6.69 | 2014 | |
| 81 | Brandon Dickson | 6.68 | 2011 | |
| 82 | Brett Kennedy# | 6.67 | 2022 | |
| 83 | Eduardo Rodriguez# | 6.66 | 2016 | |
| 84 | Brandon Leibrandt# | 6.65 | 2022 | |
| 85 | Dylan File# | 6.64 | 2023 | |
| 86 | Juan Nicasio | 6.62 | 2013 | |
| 87 | Dylan Dodd# | 6.60 | 2023 | |
| 87 | Chris Martin# | 6.60 | 2015 | |
| 89 | Jackson Wolf# | 6.53 | 2023 | |
| 89 | Joey Murray# | 6.53 | 2025 | |
| 91 | Brady Rodgers | 6.52 | 2017 | |
| 91 | P.J. Walters | 6.52 | 2014 | |
| 93 | Brad Mills | 6.51 | 2013 | |
| 94 | David Hess | 6.50 | 2022 | |
| 95 | Bryan Mitchell | 6.49 | 2017 | |
| 95 | Kyle McPherson | 6.49 | 2015 | |
| 97 | Clayton Richard | 6.44 | 2016 | |
| 97 | Tyler Alexander# | 6.44 | 2025 | |
| 99 | Mason Montgomery# | 6.41 | 2025 | |
| 99 | Brandon Workman | 6.41 | 2017 |
