Spencer Strider had the highest K/9 in 2023, with 13.55 per nine innings.

Interpreted as:

strikeouts per 9 with a minimum of 1 IP per team game leaders 2023

	NAME	K/9	SEASON	TM	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	ERA-	FIP	FIP-	H/9	PRAA
1	Spencer Strider S. Strider	13.55	2023	ATL	32	19	5	.792	32	3.86	281	0	0	0	186.2	146	80	85	22	58	9	0	1	763	6	2.80	4.84	1.06	36.8	7.6	1.09	.316	4.10	87	2.85	66	7.04	30.3
2	Blake Snell B. Snell	11.70	2023	SDP	32	14	9	.609	32	2.25	234	0	0	0	180.0	115	45	47	15	99	3	0	0	742	13	4.95	2.36	0.75	31.5	13.3	1.19	.256	2.35	54	3.43	79	5.75	18
3	Kevin Gausman K. Gausman	11.53	2023	TOR	31	12	9	.571	31	3.16	237	0	0	0	185.0	163	65	72	19	55	3	0	0	763	3	2.68	4.31	0.92	31.1	7.2	1.18	.321	3.50	75	2.97	69	7.93	27.1
4	Freddy Peralta F. Peralta	11.41	2023	MIL	30	12	10	.545	30	3.86	210	0	0	0	165.2	131	71	77	26	54	6	0	0	680	6	2.93	3.89	1.41	30.9	7.9	1.12	.273	4.18	88	3.84	87	7.12	10.6
5	Kodai Senga K. Senga	10.93	2023	NYM	29	12	7	.632	29	2.98	202	0	0	0	166.1	126	55	60	17	77	5	0	0	694	14	4.17	2.62	0.92	29.1	11.1	1.22	.277	3.25	71	3.63	84	6.82	13
6	Dylan Cease D. Cease	10.88	2023	CWS	33	7	9	.438	33	4.58	214	0	0	0	177.0	172	90	98	19	79	9	0	3	784	13	4.02	2.71	0.97	27.3	10.1	1.42	.330	4.98	106	3.72	84	8.75	13.4
7	Pablo López P. López	10.86	2023	MIN	32	11	8	.579	32	3.66	234	1	1	0	194.0	176	79	81	24	48	9	0	1	801	7	2.23	4.88	1.11	29.2	6.0	1.15	.313	3.76	86	3.33	78	8.16	20.5
8	Jesús Luzardo J. Luzardo	10.48	2023	MIA	32	10	10	.500	32	3.58	208	0	0	0	178.2	162	71	79	22	55	6	0	1	741	7	2.77	3.78	1.11	28.1	7.4	1.21	.311	3.98	80	3.55	81	8.16	16.4
9	Charlie Morton C. Morton	10.08	2023	ATL	30	14	12	.538	30	3.64	183	0	0	0	163.1	150	66	70	14	83	12	0	2	716	4	4.57	2.20	0.77	25.6	11.6	1.43	.321	3.86	82	3.87	90	8.27	7.6
10	Luis Castillo L. Castillo	10.01	2023	SEA	33	13	9	.591	33	3.34	219	0	0	0	197.0	160	73	81	28	56	5	0	0	802	3	2.56	3.91	1.28	27.3	7.0	1.10	.267	3.70	83	3.80	93	7.31	6.6
11	Lucas Giolito L. Giolito	9.96	2023	TOT	33	7	15	.318	33	4.88	204	0	0	0	184.1	169	100	110	41	73	9	0	2	794	5	3.56	2.79	2.00	25.7	9.2	1.31	.274	5.37	113	5.26	120	8.25	-17.8
12	Zack Wheeler Z. Wheeler	9.94	2023	PHI	32	13	6	.684	32	3.61	212	0	0	0	192.0	168	77	82	20	39	9	0	0	787	1	1.83	5.44	0.94	26.9	5.0	1.08	.292	3.84	82	3.15	71	7.88	27.7
13	Mitch Keller M. Keller	9.73	2023	PIT	32	13	9	.591	32	4.21	210	1	1	0	194.1	187	91	97	25	55	12	0	0	825	5	2.55	3.82	1.16	25.5	6.7	1.25	.310	4.49	94	3.80	87	8.66	12.5
14	Yusei Kikuchi Y. Kikuchi	9.72	2023	TOR	32	11	6	.647	32	3.86	181	0	0	0	167.2	165	72	78	27	48	4	0	0	700	7	2.58	3.77	1.45	25.9	6.9	1.27	.314	4.19	91	4.12	96	8.86	3.1
15	Gerrit Cole G. Cole	9.56	2023	NYY	33	15	4	.789	33	2.63	222	2	2	0	209.0	157	61	64	20	48	7	0	0	821	4	2.07	4.63	0.86	27.0	5.8	0.98	.261	2.76	61	3.16	72	6.76	28.4
16	Merrill Kelly M. Kelly	9.47	2023	ARI	30	12	8	.600	30	3.29	187	0	0	0	177.2	143	65	71	20	69	4	0	0	722	3	3.50	2.71	1.01	25.9	9.6	1.19	.278	3.60	74	3.84	91	7.24	8
17	Zac Gallen Z. Gallen	9.43	2023	ARI	34	17	8	.680	34	3.47	220	1	1	0	210.0	188	81	87	22	47	5	0	0	846	8	2.01	4.68	0.94	26.0	5.6	1.12	.301	3.73	78	3.26	77	8.06	23.4
18	Zach Eflin Z. Eflin	9.42	2023	TBR	31	16	8	.667	31	3.50	186	0	0	0	177.2	158	69	69	19	24	3	0	1	703	0	1.22	7.75	0.96	26.5	3.4	1.02	.295	3.50	85	3.00	72	8.00	23.2
19	Aaron Nola A. Nola	9.39	2023	PHI	32	12	9	.571	32	4.46	202	0	0	0	193.2	178	96	105	32	45	1	0	0	793	2	2.09	4.49	1.49	25.5	5.7	1.15	.285	4.88	102	4.03	90	8.27	9.4
20	Lance Lynn L. Lynn	9.36	2023	TOT	32	13	11	.542	32	5.73	191	0	0	0	183.2	189	117	127	44	67	9	0	1	808	3	3.28	2.85	2.16	23.6	8.3	1.39	.292	6.22	133	5.53	125	9.26	-21.7
21	Corbin Burnes C. Burnes	9.29	2023	MIL	32	10	8	.556	32	3.39	200	0	0	0	193.2	141	73	77	22	66	8	0	0	784	10	3.07	3.03	1.02	25.5	8.4	1.07	.244	3.58	77	3.81	86	6.55	13.1
22	Justin Steele J. Steele	9.14	2023	CHC	30	16	5	.762	30	3.06	176	0	0	0	173.1	167	59	71	14	36	7	0	0	716	9	1.87	4.89	0.73	24.6	5.0	1.17	.317	3.69	72	3.01	70	8.67	24.9
23	Framber Valdez F. Valdez	9.09	2023	HOU	31	12	11	.522	31	3.45	200	2	2	0	198.0	166	76	86	19	57	10	0	0	808	6	2.59	3.51	0.86	24.8	7.1	1.13	.282	3.91	82	3.49	82	7.55	16.5
24	Kyle Bradish K. Bradish	8.96	2023	BAL	30	12	7	.632	30	2.83	168	0	0	0	168.2	132	53	54	14	44	8	0	0	671	9	2.35	3.82	0.75	25.0	6.6	1.04	.270	2.88	67	3.26	78	7.04	17.7
25	Sonny Gray S. Gray	8.95	2023	MIN	32	8	8	.500	32	2.79	183	0	0	0	184.0	156	57	59	8	55	6	0	0	754	6	2.69	3.33	0.39	24.3	7.3	1.15	.295	2.89	65	2.82	66	7.63	29.8