Since 1920, Jeff Byrd has walked the best walks per nine innings, with 7.01 BB/9.

Interpreted as:

MLB leaders in bb/9 with a minimum of 0.5 IP per team game since 1920

	NAME	BB/9	G	W	L	W%	GS	ERA	SO	CG	SHO	SV	IP	H	ER	R	HR	BB	HBP	GF	IBB	TBF	WP	K/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	ERA-	FIP	FIP-	H/9	PRAA
1	Jeff Byrd J. Byrd	7.01	17	2	13	.133	17	6.18	40	1	0	0	87.1	98	60	68	5	68	0	0	1	417	3	4.12	0.59	0.52	9.6	16.3	1.90	.306	7.01	147	4.89	118	10.10	-7.1
2	Tommy Byrne T. Byrne	6.85	281	85	69	.552	170	4.11	766	65	12	12	1362.0	1,138	622	688	98	1,037	85	72	10	6,181	28	5.06	0.74	0.65	12.4	16.8	1.60	.248	4.55	103	4.76	120	7.52	-126.4
3	Emmett O'Neill E. O'Neill	6.58	66	15	26	.366	49	4.76	144	19	2	0	355.2	348	188	208	14	260	8	9		1,629	16	3.64	0.55	0.35	8.8	16.0	1.71	.278	5.26	138	4.48	128	8.81	-37.3
4	Lefty Mills L. Mills	6.25	96	15	30	.333	48	6.06	267	21	1	3	435.0	453	293	325	40	302	19	27		2,058	20	5.52	0.88	0.83	13.0	14.7	1.74	.289	6.72	125	5.12	109	9.37	-17.5
5	Rex Barney R. Barney	6.17	155	35	31	.530	81	4.31	336	20	6	1	597.2	474	286	328	48	410	15	30		2,593	21	5.06	0.82	0.72	13.0	15.8	1.48	.239	4.94	110	4.61	115	7.14	-38.1
6	Bill Mooneyham B. Mooneyham	6.05	45	4	5	.444	6	4.52	75	0	0	2	99.2	103	50	53	4	67	3	18	4	456	2	6.77	1.12	0.36	16.4	14.7	1.71	.322	4.79	115	3.88	96	9.30	1.5
7	Ed Correa E. Correa	6.02	52	16	19	.457	48	5.16	260	4	2	0	282.2	261	162	174	34	189	7	3	4	1,276	29	8.28	1.38	1.08	20.4	14.8	1.59	.289	5.54	118	4.59	107	8.31	-10.7
8	Herb Score H. Score	6.01	150	55	46	.545	127	3.36	837	47	11	3	858.1	609	320	364	79	573	7	11	7	3,696	55	8.78	1.46	0.83	22.6	15.5	1.38	.241	3.82	86	3.71	95	6.39	18.4
9	Lou Kretlow L. Kretlow	5.98	199	27	47	.365	104	4.87	450	22	3	1	785.1	781	425	479	62	522	10	43	4	3,586	25	5.16	0.86	0.71	12.5	14.6	1.66	.283	5.49	122	4.37	111	8.95	-38.1
10	Jake Wade J. Wade	5.93	171	27	40	.403	71	5.00	291	20	3	3	668.1	690	371	421	43	440	9	57		3,057	20	3.92	0.66	0.58	9.5	14.4	1.69	.285	5.67	118	4.77	116	9.29	-49
11	Tex Shirley T. Shirley	5.84	102	19	30	.388	54	4.25	168	19	3	2	446.2	443	211	247	20	290	5	26		2,021	7	3.39	0.58	0.40	8.3	14.3	1.64	.275	4.98	119	4.29	120	8.93	-33.1
12	Mickey McDermott M. McDermott	5.73	291	69	69	.500	156	3.91	757	54	11	14	1316.2	1,161	572	655	86	838	28	86	8	5,801	39	5.17	0.90	0.59	13.0	14.4	1.52	.263	4.48	94	4.14	101	7.94	-0.5
13	Kaz Ishii K. Ishii	5.65	105	39	34	.534	102	4.44	435	2	2	0	564.0	508	278	310	70	354	17	0	12	2,496	22	6.94	1.23	1.12	17.4	14.2	1.53	.270	4.95	110	5.05	119	8.11	-50
14	Randy Tate R. Tate	5.62	26	5	13	.278	23	4.45	99	2	0	0	137.2	121	68	73	8	86	5	1	3	605	1	6.47	1.15	0.52	16.4	14.2	1.50	.278	4.77	128	3.88	110	7.91	-5.7
15	Bob Turley B. Turley	5.61	310	101	85	.543	237	3.64	1,265	78	24	13	1712.2	1,366	693	753	140	1,068	56	38	21	7,447	39	6.65	1.18	0.74	17.0	14.3	1.42	.249	3.96	98	4.02	108	7.18	-66.7
16	Joe Giard J. Giard	5.61	68	13	15	.464	36	5.96	71	11	4	0	277.2	330	184	202	21	173	6	13		1,294	5	2.30	0.41	0.68	5.5	13.4	1.81	.302	6.55	136	5.45	123	10.70	-27.9
17	Troy Herriage T. Herriage	5.59	31	1	13	.071	16	6.64	59	1	0	0	103.0	135	76	83	16	64	6	7	6	501	2	5.16	0.92	1.40	11.8	12.8	1.93	.334	7.25	154	5.28	126	11.80	-11.8
18	Charlie Sproull C. Sproull	5.52	34	4	10	.286	19	5.94	47	2	0	1	130.1	158	86	102	10	80	0	6		622	2	3.25	0.59	0.69	7.6	12.9	1.83	.305	7.04	158	4.66	127	10.91	-14.6
19	Al Williams A. Williams	5.50	46	4	8	.333	16	6.24	52	3	0	1	168.2	216	117	144	6	103	2	12		805	7	2.77	0.50	0.32	6.5	12.8	1.89	.327	7.68	131	4.69	102	11.53	-1.2
20	Joe Krakauskas J. Krakauskas	5.47	149	26	36	.419	63	4.53	347	22	1	4	583.2	605	294	349	30	355	4	54		2,654	19	5.35	0.98	0.46	13.1	13.4	1.64	.300	5.38	108	4.19	102	9.33	-5.5
21	Les Cain L. Cain	5.43	68	23	19	.548	64	3.98	303	8	1	0	373.0	331	165	190	32	225	13	1	3	1,645	17	7.31	1.35	0.77	18.4	13.7	1.49	.279	4.58	110	3.93	105	7.99	-5.9
22	Hal Griggs H. Griggs	5.42	105	6	26	.188	45	5.50	172	6	1	3	347.0	372	212	241	43	209	4	24	7	1,590	19	4.46	0.82	1.12	10.8	13.1	1.67	.283	6.25	139	4.92	124	9.65	-36.6
23	Roxie Lawson R. Lawson	5.41	208	47	39	.547	83	5.37	258	34	2	11	851.2	963	508	562	70	512	7	78		3,961	20	2.73	0.50	0.74	6.5	12.9	1.73	.287	5.94	113	5.34	115	10.18	-64.2
24	Bill MacDonald B. MacDonald	5.39	36	8	11	.421	21	4.66	64	6	2	1	160.1	150	83	98	17	96	2	9		703	4	3.59	0.67	0.95	9.1	13.7	1.53	.254	5.50	107	5.00	112	8.42	-8.4
25	Ken Chase K. Chase	5.36	188	53	84	.387	160	4.27	582	62	4	1	1165.0	1,188	553	647	55	694	15	18		5,283	53	4.50	0.84	0.42	11.0	13.1	1.62	.288	5.00	104	4.21	105	9.18	-28.3