Tommy Byrne has walked the highest walks per nine innings in a season, with 8.22 BB/9 in 1949.

Interpreted as:

highest bb/9 with a minimum of 1 IP per team game by a player season

	NAME	BB/9	SEASON	TM	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	Tommy Byrne T. Byrne	8.22	1949	NYY	32	15	7	.682	30	3.72	129	12	3	0	196.0	125	81	84	11	179	13	2		880	4	5.92	0.72	0.51	14.7	20.3	1.55	.208	3.86	92	4.86	120	5.74	-19
2	Hal Newhouser H. Newhouser	7.13	1941	DET	33	9	11	.450	27	4.79	106	5	1	0	173.0	166	92	109	6	137	1	5		810	5	5.51	0.77	0.31	13.1	16.9	1.75	.286	5.67	107	4.28	98	8.64	2.5
3	Tommy Byrne T. Byrne	7.08	1950	NYY	31	15	9	.625	31	4.74	118	10	2	0	203.1	188	107	115	23	160	17	0		951	3	5.22	0.74	1.02	12.4	16.8	1.71	.261	5.09	108	5.51	129	8.32	-29.6
4	Adonis Terry A. Terry	6.97	1894	TOT	24	5	12	.294	22	6.09	39	16	0	0	164.0	234	111	196	12	127	16	2		849	14	2.14	0.31	0.66	4.6	15.0	2.20	.339	10.76	110	6.91	125	12.84	-22.4
5	Sam Jones S. Jones	6.89	1955	CHC	36	14	20	.412	34	4.10	198	12	4	0	241.2	175	110	118	22	185	14	1	5	1,070	5	7.37	1.07	0.82	18.5	17.3	1.49	.235	4.39	100	4.38	106	6.52	-6.3
6	Todd Van Poppel T. Van Poppel	6.87	1994	OAK	23	7	10	.412	23	6.09	83	0	0	0	116.2	108	79	80	20	89	3	0	2	532	3	6.40	0.93	1.54	15.6	16.7	1.69	.261	6.17	132	6.29	134	8.33	-21.1
7	Randy Johnson R. Johnson	6.79	1991	SEA	33	13	10	.565	33	3.98	228	2	1	0	201.1	151	89	96	15	152	12	0	0	889	12	10.19	1.50	0.67	25.6	17.1	1.50	.282	4.29	96	4.00	99	6.75	1
8	Bob Feller B. Feller	6.74	1938	CLE	39	17	11	.607	36	4.08	240	20	2	1	277.2	225	126	136	13	208	7	3		1,248	5	7.78	1.15	0.42	19.2	16.7	1.56	.272	4.41	86	4.13	91	7.29	13
9	Bob Turley B. Turley	6.59	1954	BAL	35	14	15	.483	35	3.46	185	14	0	0	247.1	178	95	106	7	181	7	0		1,092	5	6.73	1.02	0.25	16.9	16.6	1.45	.240	3.86	99	3.55	101	6.48	-1.8
10	Bob Turley B. Turley	6.46	1955	NYY	36	17	13	.567	34	3.06	210	13	6	1	246.2	168	84	92	16	177	7	2	4	1,075	7	7.66	1.19	0.58	19.5	16.5	1.40	.229	3.36	82	3.75	102	6.13	-3.2
11	Herb Score H. Score	6.44	1959	CLE	30	9	11	.450	25	4.71	147	9	1	0	160.2	123	84	93	28	115	1	2	0	712	14	8.23	1.28	1.57	20.6	16.2	1.48	.226	5.21	124	5.14	133	6.89	-23.6
12	Sam McDowell S. McDowell	6.41	1971	CLE	35	13	17	.433	31	3.40	192	8	2	1	214.2	160	81	89	22	153	3	3	13	943	13	8.05	1.25	0.92	20.4	16.2	1.46	.241	3.73	94	4.17	113	6.71	-10.4
13	Bill Daley B. Daley	6.40	1890	BSP	34	18	7	.720	25	3.60	110	19	2	2	235.0	246	94	178	7	167	9	8		1,205	20	4.21	0.66	0.27	9.1	13.9	1.76	.262	6.82	85	4.61	110	9.42	-10.8
14	Jose De Jesus J. De Jesus	6.34	1991	PHI	31	10	9	.526	29	3.42	118	3	0	1	181.2	147	69	74	7	128	4	1	4	801	10	5.85	0.92	0.35	14.7	16.0	1.51	.257	3.67	93	4.23	113	7.28	-9.8
15	George Keefe G. Keefe	6.34	1890	BUF	25	6	16	.273	22	6.52	55	22	0	0	196.0	280	142	229	11	138	5	3		1,014	13	2.53	0.40	0.51	5.4	13.6	2.13	.334	10.52	157	5.27	128	12.86	-26.7
16	Johnny Lindell J. Lindell	6.29	1953	TOT	32	6	17	.261	26	4.66	118	15	1	0	199.0	195	103	122	17	139	6	4		910	11	5.34	0.85	0.77	13.0	15.3	1.68	.283	5.52	106	4.70	108	8.82	-7.1
17	Byron Houck B. Houck	6.24	1913	PHA	41	14	6	.700	19	4.14	71	4	1	0	176.0	147	81	93	3	122	6	11		747	10	3.63	0.58	0.15	9.5	16.3	1.53	.264	4.76	146	4.15	143	7.52	-25.7
18	Hal Gregg H. Gregg	6.24	1944	BKN	39	9	16	.360	31	5.46	92	6	0	2	197.2	201	120	142	12	137	9	7		941	10	4.19	0.67	0.55	9.8	14.6	1.71	.274	6.47	151	4.61	127	9.15	-21.8
19	Bump Hadley B. Hadley	6.20	1932	TOT	43	14	21	.400	35	5.40	145	13	1	2	248.1	261	149	168	23	171	8	5		1,155	5	5.26	0.85	0.83	12.6	14.8	1.74	.295	6.09	114	5.22	113	9.46	-14.7
20	Randy Johnson R. Johnson	6.16	1992	SEA	31	12	14	.462	31	3.77	241	6	2	0	210.1	154	88	104	13	144	18	0	1	922	13	10.31	1.67	0.56	26.1	15.6	1.42	.279	4.45	96	3.60	91	6.59	7.9
21	Nolan Ryan N. Ryan	6.14	1977	CAL	37	19	16	.543	37	2.77	341	22	4	0	299.0	198	92	110	12	204	9	0	7	1,272	21	10.26	1.67	0.36	26.8	16.0	1.34	.263	3.31	72	3.11	79	5.96	27.9
22	Frank Bates F. Bates	6.12	1899	TOT	22	1	18	.053	19	6.90	13	17	0	0	161.2	246	124	183	6	110	23	3		839	5	0.72	0.12	0.33	1.5	13.1	2.20	.349	10.19	179	5.73	149	13.69	-33.8
23	J.R. Richard	6.12	1975	HOU	33	12	10	.545	31	4.39	176	7	1	0	203.0	178	99	107	8	138	4	1	0	905	20	7.80	1.28	0.35	19.4	15.2	1.56	.294	4.74	129	3.45	100	7.89	-0.6
24	Herb Score H. Score	6.10	1955	CLE	33	16	10	.615	32	2.85	245	11	2	0	227.1	158	72	85	18	154	1	0	1	978	12	9.70	1.59	0.71	25.1	15.7	1.37	.250	3.37	72	3.29	84	6.26	15.6
25	Dave Morehead D. Morehead	6.05	1964	BOS	32	8	15	.348	30	4.97	139	3	1	0	166.2	156	92	101	14	112	4	0	2	764	8	7.51	1.24	0.76	18.2	14.7	1.61	.287	5.45	129	4.12	103	8.42	-1.6