highest career strikeouts per 9 with at least 300 innings pitched

Aroldis Chapman has the highest career K/9 when pitching at least 300 innings, with 14.58 per nine innings.

Interpreted as:

highest career strikeouts per 9 by a player with at least 300 innings pitched

	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	Aroldis Chapman A. Chapman	14.58	821.1	863	60	47	.561	0	2.52	1,331	0	0	367	475	230	255	54	408	33	563	7	3,341	87	4.47	3.26	0.59	39.8	12.2	1.08	.278	2.79	61	2.36	57	5.20	161.8
2	Josh Hader J. Hader	14.56	512.1	468	34	31	.523	0	2.64	829	0	0	226	282	150	164	65	198	24	321	6	2,019	19	3.48	4.19	1.14	41.1	9.8	0.94	.240	2.88	64	2.88	69	4.95	75.7
3	Edwin Díaz E. Díaz	14.54	519.1	520	28	36	.438	0	2.82	839	0	0	253	356	163	176	54	182	40	395	9	2,105	33	3.15	4.61	0.94	39.9	8.6	1.04	.305	3.05	70	2.55	61	6.17	93.4
4	Dellin Betances D. Betances	14.45	394.1	374	21	23	.477	1	2.53	633	0	0	36	240	111	124	26	183	28	86	5	1,613	28	4.18	3.46	0.59	39.2	11.3	1.07	.288	2.83	61	2.39	56	5.48	78.8
5	Craig Kimbrel C. Kimbrel	14.04	821.2	851	56	48	.538	0	2.58	1,282	0	0	440	492	236	263	75	346	40	656	11	3,306	70	3.79	3.71	0.82	38.8	10.5	1.02	.267	2.88	63	2.60	64	5.39	131.8
6	Kenley Jansen K. Jansen	12.40	927.1	934	54	40	.574	0	2.57	1,278	0	0	475	610	265	284	88	282	32	700	20	3,680	21	2.74	4.53	0.85	34.7	7.7	0.96	.261	2.76	65	2.62	64	5.92	147.2
7	Kirby Yates K. Yates	12.39	452.2	472	30	24	.556	0	3.36	623	0	0	98	332	169	183	63	181	29	211	13	1,883	18	3.60	3.44	1.25	33.1	9.6	1.13	.273	3.64	82	3.61	87	6.60	28.3
8	Spencer Strider S. Strider	12.38	455.0	90	38	24	.613	77	3.74	626	0	0	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
9	Ken Giles K. Giles	12.26	355.1	362	14	18	.438	0	2.71	484	0	0	115	283	107	121	28	114	5	208	5	1,454	24	2.89	4.25	0.71	33.3	7.8	1.12	.310	3.06	66	2.45	58	7.17	68
10	Bryan Abreu B. Abreu	12.23	329.2	317	16	12	.571	0	2.65	448	0	0	16	239	97	107	25	148	22	62	0	1,369	20	4.04	3.03	0.68	32.7	10.8	1.17	.295	2.92	65	2.98	72	6.52	41.9
11	Rob Dibble R. Dibble	12.17	477.0	385	27	25	.519	0	2.98	645	0	0	89	332	158	169	27	238	12	204	25	1,979	36	4.49	2.71	0.51	32.6	12.0	1.19	.289	3.19	77	2.43	61	6.26	74.2
12	Trevor Rosenthal T. Rosenthal	12.12	364.0	373	12	25	.324	0	3.36	490	0	0	132	304	136	145	19	177	22	207	8	1,570	23	4.38	2.77	0.47	31.2	11.3	1.32	.331	3.59	85	2.74	70	7.52	48.2
13	Corey Knebel C. Knebel	11.94	306.2	312	13	16	.448	4	3.26	407	0	0	72	237	111	122	34	143	11	137	13	1,282	7	4.20	2.85	1.00	31.7	11.2	1.24	.295	3.58	79	3.43	83	6.96	24.9
14	Billy Wagner B. Wagner	11.92	903.0	853	47	40	.540	0	2.31	1,196	0	0	422	601	232	262	82	300	33	703	26	3,600	43	2.99	3.99	0.82	33.2	8.3	1.00	.261	2.61	54	2.72	63	5.99	159
15	Brad Lidge B. Lidge	11.92	603.1	603	26	32	.448	1	3.54	799	0	0	225	492	237	257	57	287	34	368	41	2,589	46	4.28	2.78	0.85	30.9	11.1	1.29	.308	3.83	82	3.26	75	7.34	72.7
16	David Robertson D. Robertson	11.83	894.1	881	68	46	.596	1	2.93	1,176	0	0	179	674	291	315	81	365	25	358	38	3,690	57	3.67	3.22	0.82	31.9	9.9	1.16	.290	3.17	70	2.98	70	6.78	122.3
17	José Leclerc J. Leclerc	11.72	369.1	360	12	21	.364	3	3.34	481	0	0	41	251	137	151	32	205	21	141	8	1,563	25	5.00	2.35	0.78	30.8	13.1	1.23	.266	3.68	76	3.53	81	6.12	34.4
18	Garrett Crochet G. Crochet	11.64	424.1	136	27	24	.529	64	2.95	549	1	1	0	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
19	Carlos Marmol C. Marmol	11.60	577.0	519	23	35	.397	13	3.57	744	0	0	117	385	229	242	49	395	51	259	22	2,521	35	6.16	1.88	0.76	29.5	15.7	1.35	.262	3.77	85	3.95	94	6.01	15.6
20	Dinelson Lamet D. Lamet	11.60	367.2	121	17	24	.415	60	4.63	474	0	0	1	311	189	206	53	170	22	12	3	1,586	31	4.16	2.79	1.30	29.9	10.7	1.31	.298	5.04	108	4.03	93	7.61	12
21	Tanner Scott T. Scott	11.54	425.2	444	32	28	.533	0	3.72	546	0	0	78	352	176	200	39	220	25	167	14	1,836	29	4.65	2.48	0.82	29.7	12.0	1.34	.311	4.23	87	3.52	82	7.44	36.7
22	Cody Allen C. Allen	11.51	463.2	481	24	31	.436	0	3.14	593	0	0	153	375	162	179	55	193	10	291	13	1,943	40	3.75	3.07	1.07	30.5	9.9	1.23	.293	3.47	74	3.42	82	7.28	37.3
23	Ernesto Frieri E. Frieri	11.48	303.1	304	11	14	.440	0	3.59	387	0	0	73	232	121	127	42	143	22	174	13	1,287	6	4.24	2.71	1.25	30.1	11.1	1.24	.274	3.77	97	3.95	103	6.88	-4.1
24	José Alvarado J. Alvarado	11.46	368.1	408	19	27	.413	1	3.47	469	0	0	52	290	142	166	26	195	13	103	19	1,586	39	4.76	2.41	0.64	29.6	12.3	1.32	.299	4.06	83	3.23	76	7.09	40.7
25	Jake Diekman J. Diekman	11.42	602.1	705	27	34	.443	0	3.91	764	0	0	19	483	262	312	53	358	47	141	21	2,662	44	5.35	2.13	0.79	28.7	13.4	1.40	.299	4.66	95	3.77	91	7.22	23.8