Chris Sale has the best career K/9, with 11.13 per nine innings.

Interpreted as:

highest k/9 with a minimum of 1500 IP by a player in the last 3 seasom

	NAME	K/9	IP	G	W	L	W%	GS	ERA	SO	CG	SHO	SV	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	Chris Sale C. Sale	11.13	2078.1	392	144	88	.621	312	3.01	2,570	16	3	12	1,688	696	749	213	485	130	25	15	8,367	48	2.10	5.30	0.92	30.7	5.8	1.05	.297	3.24	71	2.88	69	7.31	301.4
2	Jacob deGrom J. deGrom	10.82	1539.2	248	96	65	.596	248	2.57	1,851	4	2	0	1,173	440	477	146	345	25	0	13	6,045	30	2.02	5.37	0.85	30.6	5.7	0.99	.279	2.79	66	2.70	66	6.86	239.5
3	Randy Johnson R. Johnson	10.61	4135.1	618	303	166	.646	603	3.29	4,875	100	37	2	3,346	1,513	1,703	411	1,497	190	7	37	17,067	109	3.26	3.26	0.89	28.6	8.8	1.17	.291	3.71	75	3.18	73	7.28	554.3
4	Max Scherzer M. Scherzer	10.60	2963.0	483	220	117	.653	474	3.22	3,489	12	5	0	2,433	1,059	1,132	354	779	114	2	20	11,987	80	2.37	4.48	1.08	29.1	6.5	1.08	.287	3.44	77	3.23	78	7.39	302.5
5	Yu Darvish Y. Darvish	10.51	1773.0	296	114	93	.551	296	3.65	2,071	2	1	0	1,454	719	754	229	561	83	0	8	7,285	83	2.85	3.69	1.16	28.4	7.7	1.14	.282	3.83	87	3.57	85	7.38	122.2
6	Gerrit Cole G. Cole	10.37	1954.0	317	153	80	.657	317	3.18	2,251	8	5	0	1,627	690	740	217	500	61	0	8	7,861	58	2.30	4.50	1.00	28.6	6.4	1.09	.292	3.41	79	3.16	77	7.49	213.5
7	Pedro Martinez P. Martinez	10.04	2827.1	476	219	100	.687	409	2.93	3,154	46	17	3	2,221	919	1,006	239	760	141	23	30	11,394	62	2.42	4.15	0.76	27.7	6.7	1.05	.279	3.20	66	2.91	68	7.07	454.6
8	Aaron Nola A. Nola	9.84	1707.2	284	108	89	.548	284	3.84	1,867	6	4	0	1,520	729	768	216	449	56	0	16	7,013	18	2.37	4.16	1.14	26.6	6.4	1.15	.295	4.05	91	3.51	82	8.01	145.6
9	Clayton Kershaw C. Kershaw	9.62	2849.0	453	222	96	.698	450	2.54	3,045	25	15	0	2,189	804	881	235	712	46	1	28	11,255	107	2.25	4.28	0.74	27.1	6.3	1.02	.271	2.78	65	2.85	70	6.92	373.2
10	Nolan Ryan N. Ryan	9.55	5386.0	807	324	292	.526	773	3.19	5,714	222	61	3	3,923	1,911	2,178	321	2,795	158	13	78	22,575	277	4.67	2.04	0.54	25.3	12.4	1.25	.265	3.64	90	2.96	83	6.56	370.2
11	Zack Wheeler Z. Wheeler	9.48	1728.1	283	113	75	.601	283	3.28	1,820	5	3	0	1,475	630	683	166	490	76	0	14	7,086	41	2.55	3.71	0.86	25.7	6.9	1.14	.289	3.56	82	3.28	80	7.68	164.7
12	Corey Kluber C. Kluber	9.46	1641.2	271	116	77	.601	260	3.44	1,725	18	8	1	1,486	627	684	177	368	65	4	9	6,688	31	2.02	4.69	0.97	25.8	5.5	1.13	.301	3.75	83	3.22	78	8.15	161.7
13	Tim Lincecum T. Lincecum	9.29	1682.0	278	110	89	.553	270	3.74	1,736	10	7	1	1,506	699	746	147	669	44	3	33	7,120	107	3.58	2.59	0.79	24.4	9.4	1.29	.300	3.99	99	3.44	90	8.06	81.5
14	Sandy Koufax S. Koufax	9.28	2324.1	397	165	87	.655	314	2.76	2,396	137	40	9	1,754	713	806	204	817	18	44	48	9,497	87	3.16	2.93	0.79	25.2	8.6	1.11	.256	3.12	75	2.69	75	6.79	226.6
15	Kevin Gausman K. Gausman	9.20	1907.1	360	112	113	.498	321	3.80	1,949	4	2	0	1,827	806	862	233	533	38	11	11	7,966	64	2.52	3.66	1.10	24.5	6.7	1.24	.306	4.07	92	3.60	85	8.62	132
16	Carlos Carrasco C. Carrasco	9.05	1687.1	335	112	105	.516	286	4.22	1,696	11	4	2	1,673	792	832	221	468	56	23	21	7,073	61	2.50	3.62	1.18	24.0	6.6	1.27	.313	4.44	102	3.76	90	8.92	74.1
17	Lance Lynn L. Lynn	9.04	2006.1	364	143	99	.591	340	3.74	2,015	4	2	1	1,856	834	916	231	704	89	4	21	8,520	61	3.16	2.86	1.04	23.7	8.3	1.28	.296	4.11	91	3.82	93	8.33	67.8
18	Sonny Gray S. Gray	9.03	1912.0	338	125	102	.551	329	3.58	1,918	7	5	0	1,668	761	833	191	619	57	2	5	7,924	106	2.91	3.10	0.90	24.2	7.8	1.20	.287	3.92	87	3.51	85	7.85	136.3
19	Francisco Liriano F. Liriano	9.01	1813.2	419	112	114	.496	300	4.15	1,815	3	1	1	1,649	837	911	184	816	62	19	15	7,781	100	4.05	2.22	0.91	23.3	10.5	1.36	.299	4.52	101	3.88	95	8.18	39.3
20	Justin Verlander J. Verlander	8.96	3561.2	554	265	158	.626	554	3.32	3,546	26	9	0	3,041	1,315	1,426	369	1,003	121	0	28	14,583	99	2.53	3.54	0.93	24.3	6.9	1.14	.280	3.60	79	3.43	81	7.68	312.1
21	Sam McDowell S. McDowell	8.86	2492.1	425	141	134	.513	346	3.17	2,453	103	23	14	1,948	879	999	164	1,312	59	39	74	10,587	140	4.74	1.87	0.59	23.2	12.4	1.31	.270	3.61	90	3.06	84	7.03	160.4
22	Johan Santana J. Santana	8.83	2025.2	360	139	78	.641	284	3.20	1,988	15	10	1	1,726	721	773	220	567	36	23	13	8,262	68	2.52	3.51	0.98	24.1	6.9	1.13	.276	3.43	74	3.43	81	7.67	187.6
23	Hideo Nomo H. Nomo	8.73	1976.1	323	123	109	.530	318	4.24	1,918	16	9	0	1,768	932	993	251	908	38	2	31	8,462	109	4.13	2.11	1.14	22.7	10.7	1.35	.284	4.52	102	4.22	98	8.05	14.5
24	Charlie Morton C. Morton	8.72	2266.1	415	147	134	.523	408	4.13	2,195	3	2	0	2,141	1,040	1,139	226	858	200	1	27	9,749	72	3.41	2.56	0.90	22.5	8.8	1.32	.305	4.52	103	3.89	97	8.50	36.7
25	David Price D. Price	8.72	2143.2	400	157	82	.657	322	3.32	2,076	17	3	3	1,930	790	865	221	562	63	19	16	8,807	40	2.36	3.69	0.93	23.6	6.4	1.16	.290	3.63	81	3.38	83	8.10	165.9