Since 2021, Spencer Strider has the best K/9 when starting 25+ games, with 12.38 per nine innings.

	NAME	K/9	GS	G	W	L	W%	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	12.38	77	90	38	24	.613	3.74	626	0	0	0	455.0	368	189	198	52	160	20	3	2	1,881	13	3.16	3.91	1.03	33.3	8.5	1.16	.309	3.92	87	3.09	75	7.28	52.1
2	Jacob deGrom J. deGrom	11.97	65	65	26	14	.650	2.46	492	1	1	0	370.0	232	101	106	44	61	5	0	0	1,391	4	1.48	8.07	1.07	35.4	4.4	0.79	.238	2.58	61	2.57	61	5.64	67
3	Blake Snell B. Snell	11.84	114	114	39	32	.549	3.06	792	1	1	0	602.0	435	205	218	51	289	9	0	2	2,499	41	4.32	2.74	0.76	31.7	11.6	1.20	.283	3.26	77	3.13	75	6.50	67.8
4	Tyler Glasnow T. Glasnow	11.67	77	77	28	18	.609	3.24	569	0	0	0	439.0	300	158	165	49	144	4	0	0	1,739	37	2.95	3.95	1.00	32.7	8.3	1.01	.258	3.38	79	3.05	73	6.15	54
5	Garrett Crochet G. Crochet	11.64	64	131	27	24	.529	2.99	541	1	1	0	418.1	342	139	151	45	119	10	17	2	1,703	15	2.56	4.55	0.97	31.8	7.0	1.10	.301	3.25	71	2.88	68	7.36	62.4
6	Shohei Ohtani S. Ohtani	11.44	88	88	35	17	.673	2.84	604	1	1	0	475.1	347	150	158	50	152	23	0	2	1,912	46	2.88	3.97	0.95	31.6	7.9	1.05	.274	2.99	67	3.09	72	6.57	59.7
7	Chris Sale C. Sale	11.33	80	81	36	15	.706	2.95	572	0	0	0	454.1	380	149	160	41	113	32	0	1	1,845	10	2.24	5.06	0.81	31.0	6.1	1.09	.312	3.17	68	2.78	67	7.53	67.7
8	Dylan Cease D. Cease	11.26	162	162	56	47	.544	3.72	1,106	3	3	0	884.0	726	365	401	94	361	28	0	7	3,723	50	3.68	3.06	0.96	29.7	9.7	1.23	.296	4.08	90	3.36	80	7.39	82
9	Hunter Greene H. Greene	11.20	91	91	25	29	.463	3.65	617	2	2	0	495.2	386	201	211	70	179	39	0	0	2,060	21	3.25	3.45	1.27	30.0	8.7	1.14	.274	3.83	82	3.83	88	7.01	29.1
10	Freddy Peralta F. Peralta	10.91	139	141	54	34	.614	3.30	895	1	0	0	738.1	536	271	283	93	271	39	0	1	3,025	23	3.30	3.30	1.13	29.6	9.0	1.09	.257	3.45	78	3.64	86	6.53	47.1
11	Paul Skenes P. Skenes	10.83	55	55	21	13	.618	1.96	386	1	0	0	320.2	230	70	76	21	74	12	0	0	1,247	4	2.08	5.22	0.59	31.0	5.9	0.95	.277	2.13	46	2.39	58	6.46	61
12	Brandon Woodruff B. Woodruff	10.82	80	80	34	17	.667	2.77	558	1	1	0	464.1	337	143	153	54	114	18	0	0	1,838	5	2.21	4.89	1.05	30.4	6.2	0.97	.259	2.97	67	3.11	74	6.53	55.8
13	Cole Ragans C. Ragans	10.80	66	83	21	20	.512	3.66	461	1	0	0	384.0	312	156	168	35	144	10	1	2	1,585	22	3.38	3.20	0.82	29.1	9.1	1.19	.296	3.94	86	3.16	76	7.31	42.6
14	Gerrit Cole G. Cole	10.77	113	113	52	25	.675	3.15	821	4	3	0	686.0	540	240	252	88	168	17	0	2	2,730	11	2.20	4.89	1.15	30.1	6.2	1.03	.276	3.31	78	3.26	77	7.08	73.5
15	Carlos Rodón C. Rodón	10.67	134	134	64	39	.621	3.44	884	2	1	0	745.1	576	285	304	93	246	34	0	1	3,055	33	2.97	3.59	1.12	28.9	8.1	1.10	.269	3.67	84	3.52	83	6.96	56.8
16	Aaron Ashby A. Ashby	10.54	26	97	11	16	.407	3.62	274	0	0	5	234.0	205	94	111	24	93	11	17	0	997	15	3.58	2.95	0.92	27.5	9.3	1.27	.304	4.27	88	3.45	84	7.88	17.1
17	Max Scherzer M. Scherzer	10.48	106	106	45	24	.652	3.24	705	1	0	0	605.2	480	218	226	90	138	28	0	0	2,414	9	2.05	5.11	1.34	29.2	5.7	1.02	.268	3.36	79	3.59	85	7.13	40.3
18	Yoshinobu Yamamoto Y. Yamamoto	10.45	48	48	19	10	.655	2.66	306	0	0	0	263.2	191	78	85	21	81	4	0	0	1,052	7	2.76	3.78	0.72	29.1	7.7	1.03	.266	2.90	65	2.82	67	6.52	39.5
19	Tarik Skubal T. Skubal	10.44	127	129	53	33	.616	2.96	852	1	1	0	734.2	586	242	266	81	161	24	1	0	2,922	11	1.97	5.29	0.99	29.2	5.5	1.02	.280	3.26	72	3.02	73	7.18	88.8
20	Robbie Ray R. Ray	10.40	104	104	39	30	.565	3.49	692	1	0	0	598.2	485	232	244	93	207	21	0	0	2,451	22	3.11	3.34	1.40	28.2	8.4	1.16	.273	3.67	86	3.98	100	7.29	0.3
21	Zack Wheeler Z. Wheeler	10.32	146	146	65	35	.650	2.90	1,041	4	2	0	908.0	708	293	316	88	204	40	0	2	3,615	18	2.02	5.10	0.87	28.8	5.6	1.00	.277	3.13	69	2.94	69	7.02	130.6
22	Michael King M. King	10.27	60	151	30	27	.526	2.99	532	1	1	7	466.0	386	155	181	48	161	22	23	6	1,939	12	3.11	3.30	0.93	27.4	8.3	1.17	.287	3.50	74	3.40	82	7.45	38.4
23	Eury Pérez E. Pérez	10.27	39	39	12	12	.500	3.71	213	0	0	0	186.2	140	77	82	27	63	5	0	0	759	15	3.04	3.38	1.30	28.1	8.3	1.09	.251	3.95	85	3.88	91	6.75	7.7
24	Hayden Birdsong H. Birdsong	10.20	26	37	9	10	.474	4.77	156	0	0	0	137.2	118	73	81	21	80	9	2	0	613	10	5.23	1.95	1.37	25.4	13.1	1.44	.280	5.30	118	4.80	122	7.71	-14.1
25	Shane McClanahan S. McClanahan	10.14	74	74	33	16	.673	3.02	456	0	0	0	404.2	331	136	143	48	116	5	0	1	1,627	19	2.58	3.93	1.07	28.0	7.1	1.10	.282	3.18	77	3.35	84	7.36	29.1