Single-A Single-Season Strikeouts / 9 Record Progression

Every season that raised the bar, and the leader in every season between.

The Single-A single-season strikeouts / 9 record is 14.32, set by Kyle Harrison in 2021. It has stood for 5 years. The mark has been raised 5 times since 1990.

ERA W SO SV WHIP IP K/9 BB/9 K/BB SHO CG GS G L BB W-L%

Record Holders

6 marks since 1990

Year	Player	K/9	Stood for
2021	Kyle Harrison	14.32	still standing
1998	A.J. Burnett	14.07	23 years
1994	Billy Wagner	12.00	4 years
1992	Robbie Beckett	10.96	2 years
1991	Dave Mlicki	10.58	1 year
1990	Mo Sanford	10.27	1 year

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.

Every Season

36 seasons

Year	Leader	K/9
2026	Brady Parker	12.18
2025	Melkis Hernández	9.18
2024	Josh Bostick	10.15
2023	Trey Dombroski	11.19
2022	Will Dion	11.08
2021	Kyle Harrison	14.32	new record
2019	Seth Corry	12.62
2018	Spencer Howard	11.81
2017	Luis Escobar	11.48
2016	Angel Perdomo	11.06
2015	Justus Sheffield	9.73
2014	Kyle Lloyd	11.66
2013	Lucas Sims	10.34
2012	Kyle Crick	10.35
2011	Daniel Renken	11.20
2010	Jake Odorizzi	10.07
2009	Matt Moore	12.88
2008	David Bromberg	10.62
2007	Kyle Schmidt	9.96
2006	Jake McGee	11.49
2005	Jonathan Sánchez	11.89
2004	Adam Bostick	12.87
2003	Joe Blanton	9.74
2002	Matt Peterson	10.00
2001	Boof Bonser	11.96
2000	Chin-hui Tsao	11.61
1999	John Stephens	11.47
1998	A.J. Burnett	14.07	new record
1997	James O'Shaughnessy	11.67
1996	Joe Young	11.58
1995	Damian Moss	10.67
1994	Billy Wagner	12.00	new record
1993	Charles York	10.37
1992	Robbie Beckett	10.96	new record
1991	Dave Mlicki	10.58	new record
1990	Mo Sanford	10.27	new record