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Progressive Strikeouts per 9IP
Leaderboard
 
This table is a snapshot of the career, single-season, active, and yearly leaders at the end of each season.
* - Indicates Hall of Fame
Bold - Indicates active player
Year    Career K9    Single-Season K9    Active K9    Yearly K9 
1930      Walter Beall 6.38      Walter Beall 6.38 
1931      Pat Malone 6.50      Pat Malone 6.50 
1932    Roy Moore 4.20    Walter Beall 6.69    Roy Moore 4.20    Walter Beall 6.69 
1933    Walter Beall 6.59    Walter Beall 7.28    Walter Beall 6.59    Walter Beall 7.28 
1934    Walter Beall 6.64    Walter Beall 7.28    Walter Beall 6.64    Hub Pruett 6.78 
1935    Walter Beall 6.77    Walter Beall 7.45    Walter Beall 6.77    Walter Beall 7.45 
1936    Walter Beall 6.82    Walter Beall 7.45    Walter Beall 6.82    Walter Beall 7.07 
1937    Walter Beall 6.78    Walter Beall 7.45    Walter Beall 6.78    Pat Malone 6.77 
1938    Walter Beall 6.78    Walter Beall 7.45    Walter Beall 6.78    Pat Malone 7.09 
1939    Walter Beall 6.78    Walter Beall 7.45    Pat Malone 6.46    Pat Malone 7.34 
1940    Walter Beall 6.78    Pat Malone 8.14    Pat Malone 6.58    Pat Malone 8.14 
1941    Walter Beall 6.78    Pat Malone 8.14    Pat Malone 6.55    Johnny Vander Meer 7.08 
1942    Walter Beall 6.78    Pat Malone 8.14    Johnny Vander Meer 6.54    Johnny Vander Meer 6.67 
1943    Walter Beall 6.78    Pat Malone 8.14    Johnny Vander Meer 6.73    Johnny Vander Meer 7.58 
1944    Johnny Vander Meer 6.92    Pat Malone 8.14    Johnny Vander Meer 6.92    Johnny Vander Meer 8.02 
1945    Johnny Vander Meer 6.96    Pat Malone 8.14    Johnny Vander Meer 6.96    Johnny Vander Meer 7.20 
1946    Johnny Vander Meer 6.99    Pat Malone 8.14    Johnny Vander Meer 6.99    Johnny Vander Meer 7.23 
1947    Johnny Vander Meer 7.01    Pat Malone 8.14    Johnny Vander Meer 7.01    Johnny Vander Meer 7.22 
1948    Johnny Vander Meer 7.12    Johnny Vander Meer 8.16    Johnny Vander Meer 7.12    Johnny Vander Meer 8.16 
1949    Johnny Vander Meer 7.10    Johnny Vander Meer 8.16    Johnny Vander Meer 7.10    Johnny Vander Meer 6.85 
1950    Johnny Vander Meer 7.12    Johnny Vander Meer 8.16    Johnny Vander Meer 7.12    Johnny Vander Meer 7.44 
1951    Johnny Vander Meer 7.14    Kent Peterson 8.42    Johnny Vander Meer 7.14    Kent Peterson 8.42 
1952    Johnny Vander Meer 7.13    Kent Peterson 8.42    Johnny Vander Meer 7.13    Warren Spahn * 7.91 
1953    Ted Gray 7.21    Ted Gray 9.44    Ted Gray 7.21    Ted Gray 9.44 
1954    Ted Gray 7.40    Ted Gray 9.44    Ted Gray 7.40    Ted Gray 8.68 
1955    Ted Gray 7.58    Ted Gray 9.44    Ted Gray 7.58    Ryne Duren 9.25 
1956    Ted Gray 7.74    Herb Score 12.87    Ted Gray 7.74    Herb Score 12.87 
1957    Karl Spooner 9.03    Herb Score 12.87    Karl Spooner 9.03    Herb Score 12.02 
1958    Ryne Duren 9.68    Herb Score 12.87    Ryne Duren 9.68    Herb Score 12.01 
1959    Herb Score 12.38    Herb Score 13.30    Herb Score 12.38    Herb Score 13.30 
1960    Herb Score 12.49    Herb Score 13.30    Herb Score 12.49    Herb Score 13.02 
1961    Herb Score 12.61    Herb Score 13.30    Herb Score 12.61    Herb Score 13.28 
1962    Herb Score 12.74    Herb Score 13.45    Herb Score 12.74    Herb Score 13.45 
1963    Herb Score 12.72    Herb Score 13.45    Herb Score 12.72    Herb Score 12.64 
1964    Herb Score 12.70    Herb Score 13.45    Herb Score 12.70    Herb Score 12.50 
1965    Herb Score 12.74    Herb Score 13.45    Herb Score 12.74    Herb Score 13.07 
1966    Herb Score 12.67    Herb Score 13.45    Herb Score 12.67    Herb Score 12.00 
1967    Herb Score 12.68    Herb Score 13.45    Herb Score 12.68    Herb Score 12.75 
1968    Herb Score 12.52    Herb Score 13.45    Herb Score 12.52    Don Sutton 10.75 
1969    Herb Score 12.47    Herb Score 13.45    Herb Score 12.47    Herb Score 11.63 
1970    Herb Score 12.35    Herb Score 13.45    Herb Score 12.35    Nolan Ryan 10.51 
1971    Herb Score 12.19    Herb Score 13.45    Herb Score 12.19    Nolan Ryan 10.71 
1972    Herb Score 12.19    Herb Score 13.45    Nolan Ryan 10.63    Nolan Ryan 10.73 
1973    Herb Score 12.19    Herb Score 13.45    Nolan Ryan 10.56    Nolan Ryan 10.00 
1974    Herb Score 12.19    Herb Score 13.45    Nolan Ryan 10.34    J.R. Richard * 8.55 
1975    Herb Score 12.19    Herb Score 13.45    Nolan Ryan 10.30    Nolan Ryan 9.91 
1976    Herb Score 12.19    Herb Score 13.45    Nolan Ryan 10.19    Dave Laroche 8.43 
1977    Herb Score 12.19    Herb Score 13.45    Nolan Ryan 10.09    Nolan Ryan 8.69 
1978    Herb Score 12.19    Herb Score 13.45    Nolan Ryan 9.87    Mark Littell 7.98 
1979    Herb Score 12.19    Herb Score 13.45    Nolan Ryan 9.86    Don Sutton 7.40 
1980    Herb Score 12.19    Herb Score 13.45    Nolan Ryan 9.84    Balor Moore 8.29 
1981    Herb Score 12.19    Herb Score 13.45    Nolan Ryan 9.80    Bart Johnson 8.36 
1982    Herb Score 12.19    Herb Score 13.45    Nolan Ryan 9.81    Balor Moore 8.12 
1983    Herb Score 12.19    Herb Score 13.45    Nolan Ryan 9.81    Bart Johnson 7.79 
1984    Herb Score 12.19    Herb Score 13.45    Nolan Ryan 9.72    Bart Johnson 8.84 
1985    Herb Score 12.19    Herb Score 13.45    Balor Moore 7.85    Dwight Gooden 11.47 
1986    Herb Score 12.19    Herb Score 13.45    Jesse Orosco 8.02    Mark Langston 8.61 
1987    Herb Score 12.19    Herb Score 13.45    Jesse Orosco 8.12    Dwight Gooden 11.39 
1988    Herb Score 12.19    Herb Score 13.45    Mark Langston 8.35    Dwight Gooden 10.87 
1989    Herb Score 12.19    Herb Score 13.45    Dwight Gooden 11.38    Dwight Gooden 11.83 
1990    Herb Score 12.19    Herb Score 13.45    Dwight Gooden 11.42    Charlie Kerfeld 10.36 
 
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