Dylan Cease had the highest K/9 in 2025, with 11.52 per nine innings.

Interpreted as:

best k/9 with a minimum of 1 IP per team game pitcher this regular season

	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	Dylan Cease D. Cease	11.52	2025	SDP	32	8	12	.400	32	4.55	215	0	0	0	168.0	152	85	91	21	71	5	0	2	722	5	3.80	3.03	1.13	29.8	9.8	1.33	.320	4.88	113	3.55	87	8.14	10.1
2	Garrett Crochet G. Crochet	11.18	2025	BOS	32	18	5	.783	32	2.59	255	1	1	0	205.1	165	59	62	24	46	3	0	0	814	7	2.02	5.54	1.05	31.3	5.7	1.03	.290	2.72	60	2.88	68	7.23	30.2
3	Tarik Skubal T. Skubal	11.10	2025	DET	31	13	6	.684	31	2.21	241	1	1	0	195.1	141	48	55	18	33	5	0	0	748	3	1.52	7.30	0.83	32.2	4.4	0.89	.273	2.53	55	2.44	59	6.50	36.9
4	Jesús Luzardo J. Luzardo	10.58	2025	PHI	32	15	7	.682	32	3.92	216	0	0	0	183.2	167	80	85	16	57	3	0	0	758	2	2.79	3.79	0.78	28.5	7.5	1.22	.324	4.17	93	2.89	69	8.18	26.7
5	Yoshinobu Yamamoto Y. Yamamoto	10.42	2025	LAD	30	12	8	.600	30	2.49	201	0	0	0	173.2	113	48	53	14	59	3	0	0	684	5	3.06	3.41	0.73	29.4	8.6	0.99	.243	2.75	60	2.93	70	5.86	24.4
6	Freddy Peralta F. Peralta	10.39	2025	MIL	33	17	6	.739	33	2.70	204	0	0	0	176.2	124	53	54	21	66	9	0	0	723	4	3.36	3.09	1.07	28.2	9.1	1.08	.243	2.75	64	3.64	87	6.32	10.5
7	Paul Skenes P. Skenes	10.36	2025	PIT	32	10	10	.500	32	1.97	216	1	0	0	187.2	136	41	45	11	42	6	0	0	733	2	2.01	5.14	0.53	29.5	5.7	0.95	.273	2.16	46	2.36	57	6.52	37
8	Joe Ryan J. Ryan	10.21	2025	MIN	31	13	10	.565	30	3.42	194	0	0	0	171.0	138	65	69	26	39	12	0	0	689	0	2.05	4.97	1.37	28.2	5.7	1.04	.268	3.63	84	3.73	89	7.26	8.4
9	Sonny Gray S. Gray	10.01	2025	STL	32	14	8	.636	32	4.28	201	1	1	0	180.2	185	86	93	25	38	3	0	0	753	2	1.89	5.29	1.25	26.7	5.0	1.23	.329	4.63	104	3.38	84	9.22	13.5
10	Hunter Brown H. Brown	10.00	2025	HOU	31	12	9	.571	31	2.43	206	1	0	0	185.1	133	50	55	17	57	7	0	1	729	0	2.77	3.61	0.83	28.3	7.8	1.03	.262	2.67	60	3.13	76	6.46	20.6
11	Logan Webb L. Webb	9.74	2025	SFG	34	15	11	.577	34	3.22	224	0	0	0	207.0	210	74	82	14	46	6	0	0	856	2	2.00	4.87	0.61	26.2	5.4	1.24	.346	3.57	79	2.60	65	9.13	32.5
12	Jacob deGrom J. deGrom	9.64	2025	TEX	30	12	8	.600	30	2.97	185	0	0	0	172.2	122	57	57	26	37	3	0	0	669	3	1.93	5.00	1.36	27.7	5.5	0.92	.230	2.97	73	3.64	86	6.36	11.7
13	Bryan Woo B. Woo	9.55	2025	SEA	30	15	7	.682	30	2.94	198	0	0	0	186.2	137	61	64	26	36	4	0	0	731	3	1.74	5.50	1.25	27.1	4.9	0.93	.238	3.09	77	3.46	86	6.61	11.4
14	Shane Baz S. Baz	9.52	2025	TBR	31	10	12	.455	31	4.87	176	0	0	0	166.1	158	90	91	26	64	9	0	0	711	3	3.46	2.75	1.41	24.8	9.0	1.33	.303	4.92	124	4.36	108	8.55	-6.2
15	Will Warren W. Warren	9.48	2025	NYY	33	9	8	.529	33	4.44	171	0	0	0	162.1	158	80	90	22	65	4	0	0	711	2	3.60	2.63	1.22	24.1	9.1	1.37	.303	4.99	109	4.06	94	8.76	4.4
16	Cristopher Sánchez C. Sánchez	9.45	2025	PHI	32	13	5	.722	32	2.50	212	1	0	0	202.0	171	56	58	12	44	6	0	0	807	6	1.96	4.82	0.53	26.3	5.5	1.06	.298	2.58	59	2.54	60	7.62	36.9
17	Nick Pivetta N. Pivetta	9.41	2025	SDP	31	13	5	.722	31	2.87	190	0	0	0	181.2	129	58	63	22	50	3	0	1	721	1	2.48	3.80	1.09	26.4	6.9	0.99	.235	3.12	71	3.49	85	6.39	12.2
18	Carlos Rodón C. Rodón	9.35	2025	NYY	33	18	9	.667	33	3.09	203	0	0	0	195.1	132	67	74	22	73	9	0	0	789	4	3.36	2.78	1.01	25.7	9.3	1.05	.228	3.41	76	3.77	88	6.08	11.3
19	Gavin Williams G. Williams	9.29	2025	CLE	31	12	5	.706	31	3.06	173	0	0	0	167.2	130	57	62	23	83	3	0	0	704	9	4.46	2.08	1.23	24.6	11.8	1.27	.254	3.33	76	4.39	106	6.98	-4.9
20	Robbie Ray R. Ray	9.18	2025	SFG	32	11	8	.579	32	3.65	186	1	0	0	182.1	148	74	81	22	73	4	0	0	755	7	3.60	2.55	1.09	24.6	9.7	1.21	.268	4.00	89	3.92	99	7.31	0.6
21	Ryan Pepiot R. Pepiot	8.96	2025	TBR	31	11	12	.478	31	3.86	167	0	0	0	167.2	134	72	77	26	61	6	0	0	679	5	3.27	2.74	1.40	24.6	9.0	1.16	.258	4.13	98	4.35	108	7.19	-6.1
22	Kevin Gausman K. Gausman	8.81	2025	TOR	32	10	11	.476	32	3.59	189	1	1	0	193.0	155	77	79	21	50	3	0	2	775	1	2.33	3.78	0.98	24.4	6.5	1.06	.262	3.68	89	3.41	82	7.23	16.4
23	Yusei Kikuchi Y. Kikuchi	8.78	2025	LAA	33	7	11	.389	33	3.99	174	0	0	0	178.1	180	79	87	24	74	3	0	3	772	8	3.73	2.35	1.21	22.5	9.6	1.42	.314	4.39	96	4.22	98	9.08	1.6
24	Chris Bassitt C. Bassitt	8.77	2025	TOR	32	11	9	.550	31	3.96	166	1	0	0	170.1	174	75	80	22	52	13	0	0	736	4	2.75	3.19	1.16	22.6	7.1	1.33	.315	4.23	98	4.00	96	9.19	3.2
25	Framber Valdez F. Valdez	8.77	2025	HOU	31	13	11	.542	31	3.66	187	2	0	0	192.0	171	78	82	15	68	7	0	0	802	12	3.19	2.75	0.70	23.3	8.5	1.24	.297	3.84	90	3.37	82	8.02	16.3