12 pitchers are tied for the highest career K/9 in the postseason, with 27.00 per nine innings. The first three are Brady Singer, Zach Pop and A.J. Cole.

Interpreted as:

highest k/9 by a player in MLB playoff history

	NAME	K/9	G	W	L	W%	GS	ERA	SO	CG	SHO	SV	IP	H	ER	R	HR	BB	HBP	GF	IBB	TBF	WP	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	H/9
1	Brady Singer B. Singer	27.00	1	0	0		0	0.00	1	0	0	0	0.1	0	0	0	0	0	0	0	0	1	0	0.00		0.00	100.0	0.0	0.00		0.00	0.00
2	Zach Pop Z. Pop	27.00	1	0	0		0	0.00	1	0	0	0	0.1	2	0	0	0	0	0	0	0	3	0	0.00		0.00	33.3	0.0	6.00	1.000	0.00	54.00
3	A.J. Cole	27.00	1	0	0		0	54.00	1	0	0	0	0.1	1	2	2	1	1	0	0	0	3	0	27.00	1.00	27.00	33.3	33.3	6.00		54.00	27.00
4	DJ Johnson	27.00	1	0	0		0	0.00	2	0	0	0	0.2	1	0	0	0	0	0	0	0	3	0	0.00		0.00	66.7	0.0	1.50	1.000	0.00	13.50
5	Harrison Musgrave H. Musgrave	27.00	2	0	0		0	13.50	2	0	0	0	0.2	1	1	1	0	3	0	0	1	6	0	40.50	0.67	0.00	33.3	50.0	6.00	1.000	13.50	13.50
6	Taijuan Walker T. Walker	27.00	1	0	1	.000	1	36.00	3	0	0	0	1.0	4	4	4	1	2	0	0	1	9	0	18.00	1.50	9.00	33.3	22.2	6.00	1.000	36.00	36.00
7	Robbie Ross Jr. R. Ross Jr.	27.00	1	0	0		0	0.00	1	0	0	0	0.1	0	0	0	0	0	0	0	0	1	0	0.00		0.00	100.0	0.0	0.00		0.00	0.00
8	Joe Paterson J. Paterson	27.00	1	0	0		0	0.00	1	0	0	0	0.1	0	0	0	0	0	0	0	0	1	0	0.00		0.00	100.0	0.0	0.00		0.00	0.00
9	John Foster J. Foster	27.00	2	0	0		0	54.00	1	0	0	0	0.1	2	2	2	0	2	0	0	1	5	1	54.00	0.50	0.00	20.0	40.0	12.00	1.000	54.00	54.00
10	Jose Cabrera J. Cabrera	27.00	1	0	0		0	0.00	6	0	0	0	2.0	2	0	0	0	0	0	0	0	8	0	0.00		0.00	75.0	0.0	1.00	1.000	0.00	9.00
11	Paul Doyle P. Doyle	27.00	1	0	0		0	0.00	3	0	0	0	1.0	2	0	2	0	1	0	0	1	7	0	9.00	3.00	0.00	42.9	14.3	3.00	.667	18.00	18.00
12	Curly Ogden C. Ogden	27.00	1	0	0		1	0.00	1	0	0	0	0.1	0	0	0	0	1	0	0	0	2	0	27.00	1.00	0.00	50.0	50.0	3.00		0.00	0.00
13	Scott Oberg S. Oberg	24.92	5	1	0	1.000	0	4.15	12	0	0	0	4.1	4	2	2	0	0	0	1	0	17	1	0.00		0.00	70.6	0.0	0.92	.800	4.15	8.31
14	Yency Almonte Y. Almonte	23.14	3	0	1	.000	0	7.71	6	0	0	0	2.1	2	2	2	0	0	0	0	0	9	0	0.00		0.00	66.7	0.0	0.86	.667	7.71	7.71
15	Garrett Cleavinger G. Cleavinger	23.14	2	0	0		0	0.00	6	0	0	0	2.1	1	0	0	0	0	0	1	0	8	0	0.00		0.00	75.0	0.0	0.43	.500	0.00	3.86
16	Cionel Pérez C. Pérez	22.50	3	0	1	.000	0	4.50	5	0	0	0	2.0	3	1	1	0	1	0	1	0	10	0	4.50	5.00	0.00	50.0	10.0	2.00	.750	4.50	13.50
17	Justin Bruihl J. Bruihl	22.50	3	0	0		0	0.00	5	0	0	0	2.0	1	0	0	0	0	0	0	0	7	0	0.00		0.00	71.4	0.0	0.50	.500	0.00	4.50
18	Nate Pearson N. Pearson	22.50	1	0	0		0	0.00	5	0	0	0	2.0	0	0	0	0	0	0	0	0	6	0	0.00		0.00	83.3	0.0	0.00	.000	0.00	0.00
19	Arodys Vizcaino A. Vizcaino	22.50	2	0	0		0	0.00	5	0	0	1	2.0	1	0	0	0	1	0	2	0	8	1	4.50	5.00	0.00	62.5	12.5	1.00	.500	0.00	4.50
20	Pedro Borbon P. Borbon	22.50	2	0	0		0	0.00	5	0	0	1	2.0	1	0	0	0	0	0	1	0	7	0	0.00		0.00	71.4	0.0	0.50	.500	0.00	4.50
21	Tyler Lyons T. Lyons	21.60	2	0	0		0	0.00	4	0	0	0	1.2	0	0	0	0	0	0	1	0	5	0	0.00		0.00	80.0	0.0	0.00	.000	0.00	0.00
22	Daniel Schlereth D. Schlereth	21.60	3	0	0		0	16.20	4	0	0	0	1.2	5	3	3	0	0	0	1	0	10	1	0.00		0.00	40.0	0.0	3.00	.833	16.20	27.00
23	T.J. Mathews	21.60	3	1	0	1.000	0	0.00	4	0	0	0	1.2	3	0	0	0	1	0	1	1	9	0	5.40	4.00	0.00	44.4	11.1	2.40	.750	0.00	16.20
24	Darwinzon Hernandez D. Hernandez	20.25	2	0	0		0	13.50	3	0	0	0	1.1	2	2	2	2	1	0	0	0	7	0	6.75	3.00	13.50	42.9	14.3	2.25	.000	13.50	13.50
25	Nick Wittgren N. Wittgren	20.25	1	0	0		0	0.00	3	0	0	0	1.1	0	0	0	0	2	0	0	0	6	0	13.50	1.50	0.00	50.0	33.3	1.50	.000	0.00	0.00