MLB Postseason Single-Season Strikeouts / 9 Record Progression

Year	Player	K/9	Stood for
2021	Cristian Javier	16.03	still standing
2016	Cody Allen	15.80	5 years
2015	Wade Davis	15.19	1 year
2004	Brad Lidge	14.59	11 years
2003	Jose Contreras	13.91	1 year
2002	Francisco Rodriguez	13.50	1 year
1998	Sterling Hitchcock	13.09	4 years
1997	Mike Mussina	12.72	1 year
1939	Hilton Smith	12.51	58 years
1929	George Earnshaw	11.20	10 years
1906	Ed Walsh	10.20	23 years
1903	Bill Dinneen	7.20	3 years

The earliest marks here are records only in the sense that nobody had done better yet. Season length, schedule and the rules themselves have all changed, so a figure from the 1870s is not comparable with a modern one and is not offered as though it were.