Progressive Leaders & Records for Strikeouts per 9 IP

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Table
Year Career SO9   Single-Season SO9   ActiveSO9   Yearly SO9
1871 Al Pratt 1.362 Al Pratt 1.362
1872 Cherokee Fisher 1.636 Cherokee Fisher 1.636
1873 Bobby Mathews 1.353 Cherokee Fisher 1.636 Bobby Mathews 1.353 Bobby Mathews 1.605
1874 Bobby Mathews 1.432 Cherokee Fisher 1.636 Bobby Mathews 1.432 Bobby Mathews 1.573
1875 Bobby Mathews 1.333 Jack Manning 2.125 Bobby Mathews 1.333 Jack Manning 2.125
1876 Tommy Bond 1.432 Tommy Bond 1.941 Tommy Bond 1.432 Tommy Bond 1.941
1877 Tommy Bond 1.873 Bobby Mitchell 3.690 Tommy Bond 1.873 Bobby Mitchell 3.690
1878 Terry Larkin 2.294 Bobby Mitchell 5.738 Terry Larkin 2.294 Bobby Mitchell 5.738
1879 Will White 3.125 Bobby Mitchell 5.738 Will White 3.125 Bill McGunnigle 4.650
1880 John Ward+ 3.473 Bobby Mitchell 5.738 John Ward+ 3.473 Larry Corcoran 4.497
1881 Lee Richmond 3.475 Bobby Mitchell 5.738 Lee Richmond 3.475 George Derby 3.857
1882 Larry Corcoran 4.107 Bobby Mitchell 5.738 Larry Corcoran 4.107 Bobby Mathews 4.832
1883 Jim Whitney 4.160 Jim Whitney 6.041 Jim Whitney 4.160 Jim Whitney 6.041
1884 Hugh Daily 6.106 Hugh Daily 8.682 Hugh Daily 6.106 Hugh Daily 8.682
1885 Hugh Daily 5.878 Hugh Daily 8.682 Hugh Daily 5.878 Lady Baldwin 6.775
1886 Hugh Daily 5.758 Hugh Daily 8.682 Hugh Daily 5.758 Matt Kilroy 7.919
1887 Toad Ramsey 6.864 Hugh Daily 8.682 Toad Ramsey 6.864 Toad Ramsey 5.695
1888 Toad Ramsey 6.674 Hugh Daily 8.682 Toad Ramsey 6.674 Tim Keefe+ 6.942
1889 Toad Ramsey 6.462 Hugh Daily 8.682 Toad Ramsey 6.462 Jack Stivetts 6.715
1890 Toad Ramsey 6.491 Hugh Daily 8.682 Toad Ramsey 6.491 Toad Ramsey 6.634
1891 Toad Ramsey 6.491 Hugh Daily 8.682 Jack Stivetts 5.917 Amos Rusie+ 6.062
1892 Toad Ramsey 6.491 Hugh Daily 8.682 Amos Rusie+ 5.410 Brickyard Kennedy 5.089
1893 Toad Ramsey 6.491 Hugh Daily 8.682 Amos Rusie+ 5.090 Amos Rusie+ 3.884
1894 Toad Ramsey 6.491 Hugh Daily 8.682 Amos Rusie+ 4.906 Amos Rusie+ 3.953
1895 Toad Ramsey 6.491 Hugh Daily 8.682 Amos Rusie+ 4.867 Amos Rusie+ 4.599
1896 Toad Ramsey 6.491 Hugh Daily 8.682 Amos Rusie+ 4.867 Buttons Briggs 3.897
1897 Toad Ramsey 6.491 Hugh Daily 8.682 Amos Rusie+ 4.765 Cy Seymour 4.898
1898 Toad Ramsey 6.491 Hugh Daily 8.682 Amos Rusie+ 4.657 Cy Seymour 6.031
1899 Toad Ramsey 6.491 Hugh Daily 8.682 Amos Rusie+ 4.657 Cy Seymour 4.763
1900 Toad Ramsey 6.491 Hugh Daily 8.682 Cy Seymour 5.122 Rube Waddell+ 5.607
1901 Toad Ramsey 6.491 Hugh Daily 8.682 Cy Seymour 5.122 Tom Hughes 6.568
1902 Toad Ramsey 6.491 Hugh Daily 8.682 Cy Seymour 5.124 Rube Waddell+ 6.840
1903 Rube Waddell+ 6.734 Hugh Daily 8.682 Rube Waddell+ 6.734 Rube Waddell+ 8.389
1904 Rube Waddell+ 7.100 Hugh Daily 8.682 Rube Waddell+ 7.100 Rube Waddell+ 8.201
1905 Rube Waddell+ 7.234 Hugh Daily 8.682 Rube Waddell+ 7.234 Rube Waddell+ 7.859
1906 Rube Waddell+ 7.136 Hugh Daily 8.682 Rube Waddell+ 7.136 Red Ames 6.905
1907 Rube Waddell+ 7.160 Hugh Daily 8.682 Rube Waddell+ 7.160 Rube Waddell+ 7.335
1908 Rube Waddell+ 7.175 Hugh Daily 8.682 Rube Waddell+ 7.175 Rube Waddell+ 7.309
1909 Rube Waddell+ 7.069 Hugh Daily 8.682 Rube Waddell+ 7.069 Orval Overall 6.474
1910 Rube Waddell+ 7.039 Hugh Daily 8.682 Rube Waddell+ 7.039 Walter Johnson+ 7.614
1911 Rube Waddell+ 7.039 Hugh Daily 8.682 Walter Johnson+ 6.076 Rube Marquard+ 7.682
1912 Rube Waddell+ 7.039 Hugh Daily 8.682 Walter Johnson+ 6.357 Walter Johnson+ 7.390
1913 Rube Waddell+ 7.039 Hugh Daily 8.682 Smoky Joe Wood 6.726 Walter Johnson+ 6.321
1914 Rube Waddell+ 7.039 Hugh Daily 8.682 Smoky Joe Wood 6.600 Dutch Leonard 7.050
1915 Rube Waddell+ 7.039 Hugh Daily 8.682 Smoky Joe Wood 6.267 Grover Alexander+ 5.764
1916 Rube Waddell+ 7.039 Hugh Daily 8.682 Smoky Joe Wood 6.267 Larry Cheney 5.905
1917 Rube Waddell+ 7.039 Hugh Daily 8.682 Smoky Joe Wood 6.211 Hippo Vaughn 5.936
1918 Rube Waddell+ 7.039 Hugh Daily 8.682 Smoky Joe Wood 6.211 Guy Morton 5.157
1919 Rube Waddell+ 7.039 Hugh Daily 8.682 Smoky Joe Wood 6.208 Eric Erickson 5.523
1920 Rube Waddell+ 7.039 Hugh Daily 8.682 Smoky Joe Wood 6.206 Bullet Rogan+ 6.620
1921 Rube Waddell+ 7.039 Hugh Daily 8.682 Walter Johnson+ 5.672 Dave Brown 6.288
1922 Rube Waddell+ 7.039 Hugh Daily 8.682 Walter Johnson+ 5.537 Bill Force 6.125
1923 Rube Waddell+ 7.039 Hugh Daily 8.682 Walter Johnson+ 5.483 Nip Winters 7.246
1924 Rube Waddell+ 7.039 Hugh Daily 8.682 Walter Johnson+ 5.464 Oscar Levis 7.891
1925 Rube Waddell+ 7.039 Hugh Daily 8.682 Dazzy Vance+ 6.611 Dazzy Vance+ 7.496
1926 Rube Waddell+ 7.039 Hugh Daily 8.682 Dazzy Vance+ 6.721 Dazzy Vance+ 7.456
1927 Rube Waddell+ 7.039 Hugh Daily 8.682 Dazzy Vance+ 6.606 Satchel Paige+ 8.541
1928 Rube Waddell+ 7.039 Hugh Daily 8.682 Dazzy Vance+ 6.578 Satchel Paige+ 8.250
1929 Rube Waddell+ 7.039 Satchel Paige+ 9.162 Dazzy Vance+ 6.392 Satchel Paige+ 9.162
1930 Rube Waddell+ 7.039 Satchel Paige+ 9.162 Dazzy Vance+ 6.351 Army Cooper 8.720
1931 Rube Waddell+ 7.039 Satchel Paige+ 9.162 Dazzy Vance+ 6.336 Tom Parker 7.714
1932 Rube Waddell+ 7.039 Satchel Paige+ 9.162 Dazzy Vance+ 6.268 Bill Harvey 6.818
1933 Rube Waddell+ 7.039 Satchel Paige+ 9.162 Dazzy Vance+ 6.262 Satchel Paige+ 8.809
1934 Rube Waddell+ 7.039 Satchel Paige+ 9.391 Dazzy Vance+ 6.226 Satchel Paige+ 9.391
1935 Rube Waddell+ 7.039 Satchel Paige+ 9.391 Dazzy Vance+ 6.204 Frank Blake 9.304
1936 Rube Waddell+ 7.039 Satchel Paige+ 9.391 Dizzy Dean+ 5.698 Satchel Paige+ 9.042
1937 Rube Waddell+ 7.039 Satchel Paige+ 9.391 Dizzy Dean+ 5.672 Johnny Markham 8.874
1938 Rube Waddell+ 7.039 Frank Bradley 10.189 Dizzy Dean+ 5.548 Frank Bradley 10.189
1939 Rube Waddell+ 7.039 Frank Bradley 10.189 Dizzy Dean+ 5.395 Lefty Bowe 9.504
1940 Bob Feller+ 7.922 Frank Bradley 10.189 Bob Feller+ 7.922 Frank Bradley 9.000
1941 Bob Feller+ 7.662 Lefty Boone 10.478 Bob Feller+ 7.662 Lefty Boone 10.478
1942 Bob Feller+ 7.662 Lefty Boone 10.478 Bob Feller+ 7.662 Leon Day+ 9.288
1943 Satchel Paige+ 8.466 Lefty Boone 10.478 Satchel Paige+ 8.466 Lefty Boone 10.125
1944 Satchel Paige+ 8.562 Lefty Boone 10.478 Satchel Paige+ 8.562 Satchel Paige+ 9.610
1945 Satchel Paige+ 8.568 Lefty Boone 10.478 Satchel Paige+ 8.568 Satchel Paige+ 8.729
1946 Satchel Paige+ 8.558 Dan Bankhead 10.623 Satchel Paige+ 8.558 Dan Bankhead 10.623
1947 Satchel Paige+ 8.558 Dan Bankhead 10.623 Satchel Paige+ 8.558 Gene Richardson 9.667
1948 Satchel Paige+ 8.384 Dan Bankhead 10.623 Satchel Paige+ 8.384 Gene Collins 9.964
1949 Satchel Paige+ 8.237 Dan Bankhead 10.623 Satchel Paige+ 8.237 Tommy Byrne 5.923
1950 Satchel Paige+ 8.237 Dan Bankhead 10.623 Satchel Paige+ 8.237 Ewell Blackwell 6.483
1951 Satchel Paige+ 8.184 Dan Bankhead 10.623 Satchel Paige+ 8.184 Mickey McDermott 6.645
1952 Satchel Paige+ 7.994 Dan Bankhead 10.623 Satchel Paige+ 7.994 Vinegar Bend Mizell 6.916
1953 Satchel Paige+ 7.720 Dan Bankhead 10.623 Satchel Paige+ 7.720 Vinegar Bend Mizell 6.941
1954 Satchel Paige+ 7.720 Dan Bankhead 10.623 Satchel Paige+ 7.720 Billy Pierce 7.060
1955 Satchel Paige+ 7.720 Dan Bankhead 10.623 Satchel Paige+ 7.720 Herb Score 9.699
1956 Satchel Paige+ 7.720 Dan Bankhead 10.623 Satchel Paige+ 7.720 Herb Score 9.493
1957 Satchel Paige+ 7.720 Dan Bankhead 10.623 Satchel Paige+ 7.720 Bob Turley 7.758
1958 Satchel Paige+ 7.720 Dan Bankhead 10.623 Satchel Paige+ 7.720 Sam Jones 8.100
1959 Satchel Paige+ 7.720 Dan Bankhead 10.623 Satchel Paige+ 7.720 Herb Score 8.234
1960 Satchel Paige+ 7.720 Dan Bankhead 10.623 Satchel Paige+ 7.720 Sandy Koufax+ 10.131
1961 Satchel Paige+ 7.720 Dan Bankhead 10.623 Satchel Paige+ 7.720 Sandy Koufax+ 9.469
1962 Sandy Koufax+ 9.289 Dan Bankhead 10.623 Sandy Koufax+ 9.289 Sandy Koufax+ 10.546
1963 Sandy Koufax+ 9.195 Dan Bankhead 10.623 Sandy Koufax+ 9.195 Jim Maloney 9.527
1964 Sandy Koufax+ 9.169 Dan Bankhead 10.623 Sandy Koufax+ 9.169 Sam McDowell 9.190
1965 Sandy Koufax+ 9.349 Sam McDowell 10.714 Sandy Koufax+ 9.349 Sam McDowell 10.714
1966 Sandy Koufax+ 9.277 Sam McDowell 10.714 Sandy Koufax+ 9.277 Sam McDowell 10.420
1967 Sam McDowell 9.565 Sam McDowell 10.714 Sam McDowell 9.565 Luis Tiant 9.225
1968 Sam McDowell 9.545 Sam McDowell 10.714 Sam McDowell 9.545 Sam McDowell 9.468
1969 Sam McDowell 9.413 Sam McDowell 10.714 Sam McDowell 9.413 Tom Griffin 9.558
1970 Sam McDowell 9.342 Sam McDowell 10.714 Sam McDowell 9.342 Sam McDowell 8.970
1971 Sandy Koufax+ 9.277 Sam McDowell 10.714 Sam McDowell 9.210 Tom Seaver+ 9.084
1972 Sandy Koufax+ 9.277 Sam McDowell 10.714 Sam McDowell 9.028 Nolan Ryan+ 10.426
1973 Nolan Ryan+ 9.683 Sam McDowell 10.714 Nolan Ryan+ 9.683 Nolan Ryan+ 10.574
1974 Nolan Ryan+ 9.739 Sam McDowell 10.714 Nolan Ryan+ 9.739 Nolan Ryan+ 9.929
1975 Nolan Ryan+ 9.585 Sam McDowell 10.714 Nolan Ryan+ 9.585 Frank Tanana 9.408
1976 Nolan Ryan+ 9.698 Sam McDowell 10.714 Nolan Ryan+ 9.698 Nolan Ryan+ 10.351
1977 Nolan Ryan+ 9.774 Sam McDowell 10.714 Nolan Ryan+ 9.774 Nolan Ryan+ 10.264
1978 Nolan Ryan+ 9.792 Sam McDowell 10.714 Nolan Ryan+ 9.792 Nolan Ryan+ 9.972
1979 Nolan Ryan+ 9.728 Sam McDowell 10.714 Nolan Ryan+ 9.728 J.R. Richard 9.636
1980 Nolan Ryan+ 9.566 Sam McDowell 10.714 Nolan Ryan+ 9.566 Mario Soto 8.606
1981 Nolan Ryan+ 9.512 Sam McDowell 10.714 Nolan Ryan+ 9.512 Steve Carlton+ 8.479
1982 Nolan Ryan+ 9.459 Sam McDowell 10.714 Nolan Ryan+ 9.459 Mario Soto 9.571
1983 Nolan Ryan+ 9.400 Sam McDowell 10.714 Nolan Ryan+ 9.400 Steve Carlton+ 8.725
1984 Nolan Ryan+ 9.412 Dwight Gooden 11.395 Nolan Ryan+ 9.412 Dwight Gooden 11.394
1985 Nolan Ryan+ 9.335 Dwight Gooden 11.395 Nolan Ryan+ 9.335 Sid Fernandez 9.511
1986 Nolan Ryan+ 9.356 Dwight Gooden 11.395 Nolan Ryan+ 9.356 Mike Scott 10.002
1987 Nolan Ryan+ 9.460 Nolan Ryan+ 11.480 Nolan Ryan+ 9.460 Nolan Ryan+ 11.480
1988 Nolan Ryan+ 9.453 Nolan Ryan+ 11.480 Nolan Ryan+ 9.453 Roger Clemens 9.920
1989 Nolan Ryan+ 9.547 Nolan Ryan+ 11.480 Nolan Ryan+ 9.547 Nolan Ryan+ 11.319
1990 Nolan Ryan+ 9.575 Nolan Ryan+ 11.480 Nolan Ryan+ 9.575 Nolan Ryan+ 10.235
1991 Nolan Ryan+ 9.608 Nolan Ryan+ 11.480 Nolan Ryan+ 9.608 Nolan Ryan+ 10.561
1992 Nolan Ryan+ 9.589 Nolan Ryan+ 11.480 Nolan Ryan+ 9.589 Randy Johnson+ 10.312
1993 Nolan Ryan+ 9.548 Nolan Ryan+ 11.480 Nolan Ryan+ 9.548 Randy Johnson+ 10.856
1994 Randy Johnson+ 9.612 Nolan Ryan+ 11.480 Randy Johnson+ 9.612 Randy Johnson+ 10.674
1995 Randy Johnson+ 10.013 Randy Johnson+ 12.345 Randy Johnson+ 10.013 Randy Johnson+ 12.345
1996 Randy Johnson+ 10.112 Randy Johnson+ 12.345 Randy Johnson+ 10.112 John Smoltz+ 9.792
1997 Randy Johnson+ 10.381 Randy Johnson+ 12.345 Randy Johnson+ 10.381 Randy Johnson+ 12.296
1998 Randy Johnson+ 10.595 Kerry Wood 12.582 Randy Johnson+ 10.595 Kerry Wood 12.582
1999 Randy Johnson+ 10.772 Pedro Martinez+ 13.205 Randy Johnson+ 10.772 Pedro Martinez+ 13.205
2000 Randy Johnson+ 10.950 Pedro Martinez+ 13.205 Randy Johnson+ 10.950 Randy Johnson+ 12.559
2001 Randy Johnson+ 11.173 Randy Johnson+ 13.410 Randy Johnson+ 11.173 Randy Johnson+ 13.410
2002 Randy Johnson+ 11.207 Randy Johnson+ 13.410 Randy Johnson+ 11.207 Randy Johnson+ 11.562
2003 Randy Johnson+ 11.158 Randy Johnson+ 13.410 Randy Johnson+ 11.158 Kerry Wood 11.346
2004 Randy Johnson+ 11.119 Randy Johnson+ 13.410 Randy Johnson+ 11.119 Óliver Pérez 10.974
2005 Randy Johnson+ 10.949 Randy Johnson+ 13.410 Randy Johnson+ 10.949 Mark Prior 10.152
2006 Randy Johnson+ 10.766 Randy Johnson+ 13.410 Randy Johnson+ 10.766 Jake Peavy 9.563
2007 Randy Johnson+ 10.776 Randy Johnson+ 13.410 Randy Johnson+ 10.776 Érik Bédard 10.929
2008 Randy Johnson+ 10.670 Randy Johnson+ 13.410 Randy Johnson+ 10.670 Tim Lincecum 10.507
2009 Randy Johnson+ 10.610 Randy Johnson+ 13.410 Randy Johnson+ 10.610 Tim Lincecum 10.425
2010 Randy Johnson+ 10.610 Randy Johnson+ 13.410 Kerry Wood 10.354 Tim Lincecum 9.791
2011 Randy Johnson+ 10.610 Randy Johnson+ 13.410 Kerry Wood 10.343 Zack Greinke 10.538
2012 Randy Johnson+ 10.610 Randy Johnson+ 13.410 Kerry Wood 10.317 Max Scherzer 11.078
2013 Randy Johnson+ 10.610 Randy Johnson+ 13.410 Tim Lincecum 9.627 Yu Darvish 11.890
2014 Randy Johnson+ 10.610 Randy Johnson+ 13.410 Max Scherzer 9.593 Clayton Kershaw 10.845
2015 Randy Johnson+ 10.610 Randy Johnson+ 13.410 Max Scherzer 9.791 Chris Sale 11.818
2016 Randy Johnson+ 10.610 Randy Johnson+ 13.410 Chris Sale 10.086 José Fernández 12.488
2017 Randy Johnson+ 10.610 Randy Johnson+ 13.410 Chris Sale 10.547 Chris Sale 12.933
2018 Chris Sale 10.862 Randy Johnson+ 13.410 Chris Sale 10.862 Gerrit Cole 12.399
2019 Yu Darvish 11.124 Gerrit Cole 13.818 Yu Darvish 11.124 Gerrit Cole 13.818
2020 Yu Darvish 11.116 Shane Bieber 14.198 Yu Darvish 11.116 Shane Bieber 14.198
2021 Robbie Ray 11.210 Shane Bieber 14.198 Robbie Ray 11.210 Corbin Burnes 12.611
2022 Chris Sale 11.070 Shane Bieber 14.198 Chris Sale 11.070 Carlos Rodón 11.983
2023 Chris Sale 11.064 Shane Bieber 14.198 Chris Sale 11.064 Spencer Strider 13.548
2024 Blake Snell 11.067 Shane Bieber 14.198 Blake Snell 11.067 Jack Flaherty 12.500