Jacob deGrom has the best career K/BB, with 5.37 K/BB.

Interpreted as:

best k/bb with a minimum of 1500 IP by a player all-time

	NAME	K/BB	IP	G	W	L	W%	GS	ERA	SO	CG	SHO	SV	H	ER	R	HR	BB	HBP	GF	IBB	TBF	WP	K/9	BB/9	HR/9	K%	BB%	WHIP	BABIP	RA	ERA-	FIP	FIP-	H/9	PRAA
1	Jacob deGrom J. deGrom	5.37	1507.1	242	94	62	.603	242	2.54	1,814	4	2	0	1,151	426	463	139	338	25	0	13	5,919	28	10.83	2.02	0.83	30.6	5.7	0.99	.281	2.76	65	2.66	65	6.87	239.8
2	Chris Sale C. Sale	5.26	2047.2	387	143	87	.622	307	3.02	2,528	16	3	12	1,668	686	739	209	481	126	25	15	8,249	47	11.11	2.11	0.92	30.6	5.8	1.05	.297	3.25	71	2.88	69	7.33	297.2
3	Tommy Bond T. Bond	4.83	2779.2	322	193	115	.627	314	2.25	860	294	35	0	2,857	695	1,339	32	178		11		11,386	120	2.78	0.58	0.10	7.6	1.6	1.09	.274	4.34	89	2.38	95	9.25	32.3
4	Corey Kluber C. Kluber	4.69	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	9.46	2.02	0.97	25.8	5.5	1.13	.301	3.75	83	3.22	78	8.15	161.7
5	Max Scherzer M. Scherzer	4.50	2932.0	476	218	114	.657	467	3.17	3,459	12	5	0	2,392	1,033	1,106	346	768	114	2	20	11,845	79	10.62	2.36	1.06	29.2	6.5	1.08	.286	3.39	76	3.20	77	7.34	307.5
6	Gerrit Cole G. Cole	4.50	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	10.37	2.30	1.00	28.6	6.4	1.09	.292	3.41	79	3.16	77	7.49	213.5
7	Curt Schilling C. Schilling	4.38	3261.0	569	216	146	.597	436	3.46	3,116	83	20	22	2,998	1,253	1,318	347	711	52	81	43	13,284	72	8.60	1.96	0.96	23.5	5.4	1.14	.293	3.64	80	3.22	76	8.27	373.6
8	Clayton Kershaw C. Kershaw	4.32	2820.1	447	219	96	.695	444	2.51	3,017	25	15	0	2,164	788	865	234	698	46	1	28	11,132	107	9.63	2.23	0.75	27.1	6.3	1.01	.270	2.76	64	2.85	70	6.91	369.5
9	Aaron Nola A. Nola	4.19	1671.0	277	105	86	.550	277	3.78	1,831	6	4	0	1,482	701	739	210	437	55	0	16	6,855	18	9.86	2.35	1.13	26.7	6.4	1.15	.294	3.98	90	3.49	81	7.98	146
10	Pedro Martinez P. Martinez	4.15	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	10.04	2.42	0.76	27.7	6.7	1.05	.279	3.20	66	2.91	68	7.07	454.6
11	Dan Haren D. Haren	4.03	2419.2	391	153	131	.539	380	3.75	2,013	16	6	1	2,357	1,009	1,105	305	500	67	4	39	10,022	98	7.49	1.86	1.13	20.1	5.0	1.18	.288	4.11	92	3.77	92	8.77	92.8
12	Cliff Lee C. Lee	3.93	2156.2	328	143	91	.611	324	3.52	1,824	29	12	0	2,116	843	923	223	464	50	1	12	8,917	41	7.61	1.94	0.93	20.5	5.2	1.20	.298	3.85	84	3.44	82	8.83	168.2
13	Zack Greinke Z. Greinke	3.91	3389.1	586	225	156	.591	541	3.49	2,979	17	5	1	3,207	1,315	1,410	367	762	79	8	25	13,877	101	7.91	2.02	0.97	21.5	5.5	1.17	.293	3.74	83	3.51	85	8.52	235
14	Jim Whitney J. Whitney	3.82	3496.1	413	191	204	.484	396	2.97	1,571	377	26	2	3,598	1,154	2,026	79	411	28	16		14,666	214	4.04	1.06	0.20	10.7	2.8	1.15	.280	5.22	96	2.75	87	9.26	148.2
15	Madison Bumgarner M. Bumgarner	3.81	2209.1	358	134	124	.519	355	3.47	2,070	16	7	0	2,007	853	933	258	544	89	1	38	9,098	29	8.43	2.22	1.05	22.8	6.0	1.15	.285	3.80	90	3.62	94	8.18	50.1
16	Zack Wheeler Z. Wheeler	3.71	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	9.48	2.55	0.86	25.7	6.9	1.14	.289	3.56	82	3.28	80	7.68	164.4
17	David Price D. Price	3.69	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	8.72	2.36	0.93	23.6	6.4	1.16	.290	3.63	81	3.38	83	8.10	165.9
18	Jon Lieber J. Lieber	3.68	2198.0	401	131	124	.514	327	4.27	1,553	25	5	2	2,388	1,043	1,158	285	422	49	18	52	9,300	30	6.36	1.73	1.17	16.7	4.5	1.28	.301	4.74	98	4.01	90	9.78	104.3
19	Jordan Zimmermann J. Zimmermann	3.67	1614.0	279	95	91	.511	275	4.07	1,271	8	4	0	1,673	730	789	195	346	60	2	12	6,766	25	7.09	1.93	1.09	18.8	5.1	1.25	.302	4.40	99	3.86	95	9.33	28.2
20	Yu Darvish Y. Darvish	3.67	1739.2	289	112	91	.552	289	3.62	2,036	2	1	0	1,424	699	733	221	555	79	0	8	7,149	82	10.53	2.87	1.14	28.5	7.8	1.14	.283	3.79	86	3.54	84	7.37	125.7
21	Bret Saberhagen B. Saberhagen	3.64	2562.2	399	167	117	.588	371	3.34	1,715	76	16	1	2,452	952	1,036	218	471	59	13	34	10,421	53	6.02	1.65	0.77	16.5	4.5	1.14	.281	3.64	80	3.26	80	8.61	225.4
22	John Ward J. Ward	3.64	2469.2	293	164	103	.614	262	2.10	920	245	24	3	2,324	576	1,185	26	253		32		10,164	144	3.35	0.92	0.09	9.1	2.5	1.04		4.32	82	2.43	96	8.47	9.1
23	Kevin Gausman K. Gausman	3.62	1860.2	353	110	111	.498	314	3.84	1,903	3	1	0	1,790	793	849	231	525	38	11	11	7,785	63	9.20	2.54	1.12	24.4	6.7	1.24	.306	4.11	93	3.63	86	8.66	122
24	Carlos Carrasco C. Carrasco	3.62	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	9.05	2.50	1.18	24.0	6.6	1.27	.313	4.44	102	3.76	90	8.92	74.1
25	Ben Sheets B. Sheets	3.59	1596.2	250	94	96	.495	250	3.78	1,325	18	4	0	1,577	670	736	184	369	32	0	28	6,640	53	7.47	2.08	1.04	20.0	5.6	1.22	.295	4.15	89	3.65	85	8.89	120.8