Since 2015, Spencer Strider has the highest K/9, with 12.38 per nine innings.

Interpreted as:

best k/9 with a minimum of 0.5 IP per team game by a player since 2015

	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	ERA-	FIP	FIP-	H/9	PRAA
1	Spencer Strider S. Strider	12.38	90	38	24	.613	77	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	Jose Fernandez J. Fernandez	12.10	40	22	9	.710	40	2.88	332	0	0	0	247.0	210	79	84	17	69	8	0	6	1,002	11	2.51	4.81	0.62	33.1	6.9	1.13	.335	3.06	74	2.28	58	7.65	46.7
3	Chris Sale C. Sale	11.76	228	101	59	.631	227	3.13	1,842	9	2	0	1409.1	1,145	490	528	150	314	97	0	3	5,686	28	2.01	5.87	0.96	32.4	5.5	1.04	.303	3.37	72	2.80	66	7.31	222.8
4	Garrett Crochet G. Crochet	11.64	136	27	24	.529	64	2.95	549	1	1	0	424.1	345	139	151	45	119	11	18	2	1,725	15	2.52	4.61	0.95	31.8	6.9	1.09	.300	3.20	70	2.86	67	7.32	64.7
5	Max Scherzer M. Scherzer	11.32	276	129	67	.658	276	2.96	2,168	11	4	0	1723.2	1,311	566	594	221	390	70	0	13	6,849	35	2.04	5.56	1.15	31.7	5.7	0.99	.273	3.10	71	3.11	74	6.85	206.4
6	Hunter Greene H. Greene	11.20	91	25	29	.463	91	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
7	Blake Snell B. Snell	11.19	222	81	62	.566	222	3.15	1,440	1	1	0	1158.0	891	405	440	111	521	11	0	6	4,791	86	4.05	2.76	0.86	30.1	10.9	1.22	.288	3.42	77	3.31	79	6.92	111.7
8	Freddy Peralta F. Peralta	11.15	211	70	42	.625	162	3.59	1,153	1	0	1	931.0	694	371	392	118	360	48	6	3	3,853	31	3.48	3.20	1.14	29.9	9.3	1.13	.265	3.79	85	3.66	87	6.71	59.2
9	Jacob deGrom J. deGrom	10.98	226	87	59	.596	226	2.56	1,707	4	2	0	1399.1	1,056	398	433	139	302	24	0	11	5,480	29	1.94	5.65	0.89	31.1	5.5	0.97	.277	2.78	65	2.70	65	6.79	223.5
10	Robbie Ray R. Ray	10.93	256	87	77	.530	255	3.86	1,715	2	1	0	1412.1	1,207	605	648	211	597	51	0	19	5,961	58	3.80	2.87	1.34	28.8	10.0	1.28	.294	4.13	91	4.04	98	7.69	9.5
11	Dylan Cease D. Cease	10.91	188	65	58	.528	188	3.88	1,231	3	3	0	1015.1	854	438	482	121	430	35	0	9	4,304	55	3.81	2.86	1.07	28.6	10.0	1.26	.295	4.27	93	3.66	85	7.57	67.6
12	Paul Skenes P. Skenes	10.83	55	21	13	.618	55	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
13	Cole Ragans C. Ragans	10.80	83	21	20	.512	66	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	DJ Herz	10.76	19	4	9	.308	19	4.16	106	0	0	0	88.2	76	41	45	11	36	3	0	0	382	5	3.65	2.94	1.12	27.7	9.4	1.26	.288	4.57	102	3.70	90	7.71	3.9
15	Stephen Strasburg S. Strasburg	10.71	138	70	32	.686	138	3.42	977	1	1	0	820.2	676	312	333	90	228	32	0	14	3,348	23	2.50	4.29	0.99	29.2	6.8	1.10	.290	3.65	81	3.15	75	7.41	98
16	Gerrit Cole G. Cole	10.67	276	132	68	.660	276	3.14	2,013	8	5	0	1698.2	1,391	592	639	199	432	49	0	7	6,821	45	2.29	4.66	1.05	29.5	6.3	1.07	.289	3.39	76	3.17	75	7.37	198.3
17	Danny Salazar D. Salazar	10.54	79	30	23	.566	75	3.79	503	0	0	0	429.1	375	181	193	55	163	12	3	4	1,797	18	3.42	3.09	1.15	28.0	9.1	1.25	.301	4.05	88	3.68	88	7.86	24.8
18	Brandon Woodruff B. Woodruff	10.52	142	53	28	.654	127	3.10	871	2	1	1	745.0	580	257	269	84	190	32	4	1	2,984	8	2.30	4.58	1.01	29.2	6.4	1.03	.274	3.25	73	3.18	75	7.01	89
19	Yoshinobu Yamamoto Y. Yamamoto	10.45	48	19	10	.655	48	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
20	Tarik Skubal T. Skubal	10.44	137	54	37	.593	134	3.08	889	1	1	0	766.2	614	262	287	90	172	26	1	0	3,056	11	2.02	5.17	1.06	29.1	5.6	1.03	.279	3.37	75	3.14	76	7.21	84
21	Corbin Burnes C. Burnes	10.36	210	63	38	.624	149	3.15	1,114	0	0	2	968.0	756	339	374	104	280	38	16	3	3,914	42	2.60	3.98	0.97	28.5	7.2	1.07	.274	3.48	75	3.25	78	7.03	100.7
22	Eury Pérez E. Pérez	10.27	39	12	12	.500	39	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
23	Jack Flaherty J. Flaherty	10.27	190	63	56	.529	184	3.80	1,130	0	0	0	990.2	836	418	440	135	351	54	0	10	4,120	35	3.19	3.22	1.23	27.4	8.5	1.20	.286	4.00	93	3.89	94	7.59	28.8
24	Chris Archer C. Archer	10.25	182	43	70	.381	181	4.11	1,144	1	1	0	1004.1	925	459	503	135	353	24	0	5	4,254	55	3.16	3.24	1.21	26.9	8.3	1.27	.304	4.51	101	3.74	91	8.29	42.3
25	Yu Darvish Y. Darvish	10.19	214	76	68	.528	214	3.82	1,395	0	0	0	1232.2	1,026	523	545	178	345	63	0	5	5,043	54	2.52	4.04	1.30	27.7	6.8	1.11	.277	3.98	91	3.77	89	7.49	65.5