Since 1970, George Kirby has walked the worst walks per nine innings, with 1.27 BB/9.

Interpreted as:

lowest bb/9 with a minimum of 0.5 IP per team game by a player in MLB history since 1970

	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	George Kirby G. Kirby	1.27	104	42	31	.575	104	3.47	574	1	0	0	596.2	566	230	245	66	84	22	0	1	2,419	12	8.66	6.83	1.00	23.7	3.5	1.09	.299	3.70	90	3.22	81	8.54	51
2	Josh Tomlin J. Tomlin	1.29	286	69	56	.552	150	4.77	736	5	1	2	1067.0	1,160	566	602	197	153	25	55	16	4,453	28	6.21	4.81	1.66	16.5	3.4	1.23	.288	5.08	114	4.64	112	9.78	-57
3	Dan Quisenberry D. Quisenberry	1.40	674	56	46	.549	0	2.76	379	0	0	244	1043.1	1,064	320	356	59	162	7	553	70	4,247	4	3.27	2.34	0.51	8.9	3.8	1.18	.276	3.07	69	3.23	82	9.18	81.6
4	Bob Tewksbury B. Tewksbury	1.45	302	110	102	.519	277	3.92	812	31	7	1	1807.0	2,043	787	884	142	292	41	8	22	7,623	24	4.04	2.78	0.71	10.7	3.8	1.29	.300	4.40	95	3.64	89	10.18	89.8
5	Shota Imanaga S. Imanaga	1.50	46	23	8	.742	46	3.01	253	0	0	0	269.1	225	90	101	44	45	4	0	0	1,071	3	8.45	5.62	1.47	23.6	4.2	1.00	.250	3.38	75	3.93	98	7.52	1.6
6	Kevin Slowey K. Slowey	1.51	137	43	36	.544	106	4.62	495	3	2	0	662.0	765	340	354	99	111	22	7	3	2,828	11	6.73	4.46	1.35	17.5	3.9	1.32	.317	4.81	112	4.15	102	10.40	-6.5
7	Josh Towers J. Towers	1.51	139	45	55	.450	112	4.95	389	4	2	1	731.1	887	402	441	122	123	35	14	13	3,158	6	4.79	3.16	1.50	12.3	3.9	1.38	.307	5.43	110	4.82	107	10.92	-26
8	Spencer Schwellenbach S. Schwellenbach	1.57	38	15	11	.577	38	3.23	235	1	0	0	234.1	195	84	93	27	41	8	0	2	934	5	9.03	5.73	1.04	25.2	4.4	1.01	.270	3.57	77	3.25	81	7.49	19.6
9	Brad Radke B. Radke	1.63	378	148	139	.516	377	4.22	1,467	37	10	0	2451.0	2,643	1,150	1,233	326	445	62	0	12	10,244	28	5.39	3.30	1.20	14.3	4.3	1.26	.292	4.53	90	4.24	94	9.71	75.2
10	Bret Saberhagen B. Saberhagen	1.65	399	167	117	.588	371	3.34	1,715	76	16	1	2562.2	2,452	952	1,036	218	471	59	13	34	10,421	53	6.02	3.64	0.77	16.5	4.5	1.14	.281	3.64	80	3.26	80	8.61	225.4
11	Rick Reed R. Reed	1.66	273	93	76	.550	245	4.03	970	14	7	1	1545.2	1,601	692	748	213	285	44	6	28	6,407	11	5.65	3.40	1.24	15.1	4.4	1.22	.284	4.36	95	4.21	99	9.32	2.8
12	Colton Gordon C. Gordon	1.70	15	4	4	.500	13	5.64	62	0	0	0	68.2	91	43	46	17	13	2	1	2	310	3	8.13	4.77	2.23	20.0	4.2	1.51	.343	6.03	140	5.17	125	11.93	-8.1
13	Carlos Silva C. Silva	1.73	316	70	70	.500	180	4.68	554	6	2	2	1241.2	1,496	645	687	153	238	45	39	25	5,319	32	4.02	2.33	1.11	10.4	4.5	1.40	.310	4.98	108	4.48	105	10.84	-32.9
14	Jon Lieber J. Lieber	1.73	401	131	124	.514	327	4.27	1,553	25	5	2	2198.0	2,388	1,043	1,158	285	422	49	18	52	9,300	30	6.36	3.68	1.17	16.7	4.5	1.28	.301	4.74	98	4.01	90	9.78	104.3
15	Miles Mikolas M. Mikolas	1.74	233	70	73	.490	205	4.23	874	3	2	0	1213.2	1,234	571	606	159	234	49	10	7	5,050	16	6.48	3.74	1.18	17.3	4.6	1.21	.288	4.49	104	4.12	102	9.15	-9.5
16	Eric Hillman E. Hillman	1.75	49	4	14	.222	36	4.85	96	3	1	0	232.0	285	125	144	30	45	8	3	7	1,010	2	3.72	2.13	1.16	9.5	4.5	1.42	.307	5.59	125	4.49	115	11.06	-15
17	Bryan Woo B. Woo	1.77	63	21	14	.600	63	3.30	339	0	0	0	355.0	284	130	138	49	70	13	0	1	1,417	3	8.59	4.84	1.24	23.9	4.9	1.00	.248	3.50	85	3.74	93	7.20	9.9
18	Masahiro Tanaka M. Tanaka	1.78	174	78	46	.629	173	3.74	991	7	4	0	1054.1	983	438	476	159	208	26	0	1	4,299	32	8.46	4.76	1.36	23.1	4.8	1.13	.283	4.06	88	3.90	89	8.39	53.3
19	Greg Maddux G. Maddux	1.80	744	355	227	.610	740	3.16	3,371	109	35	0	5008.1	4,726	1,756	1,981	353	999	137	3	177	20,421	70	6.06	3.37	0.63	16.5	4.9	1.14	.281	3.56	76	3.25	78	8.49	519.5
20	Fritz Peterson F. Peterson	1.82	212	84	79	.515	204	3.53	552	51	11	1	1337.2	1,427	525	603	119	271	29	4	40	5,569	25	3.71	2.04	0.80	9.9	4.9	1.27	.284	4.06	103	3.53	100	9.60	-1.7
21	Zach Eflin Z. Eflin	1.85	200	68	67	.504	188	4.28	922	5	3	1	1073.2	1,106	511	550	162	221	32	5	14	4,501	14	7.73	4.17	1.36	20.5	4.9	1.24	.298	4.61	104	4.12	97	9.27	14.1
22	Dan Haren D. Haren	1.86	391	153	131	.539	380	3.75	2,013	16	6	1	2419.2	2,357	1,009	1,105	305	500	67	4	39	10,022	98	7.49	4.03	1.13	20.1	5.0	1.18	.288	4.11	92	3.77	92	8.77	92.8
23	David Wells D. Wells	1.88	660	239	157	.604	489	4.13	2,201	54	12	13	3439.0	3,635	1,578	1,702	407	719	83	65	65	14,413	101	5.76	3.06	1.07	15.3	5.0	1.27	.293	4.45	93	3.99	90	9.51	172.9
24	Hisashi Iwakuma H. Iwakuma	1.88	150	63	39	.618	136	3.42	714	1	1	2	883.2	825	336	352	115	185	15	6	13	3,574	23	7.27	3.86	1.17	20.0	5.2	1.14	.279	3.59	89	3.86	97	8.40	8.5
25	Chris Paddack C. Paddack	1.91	109	31	34	.477	106	4.46	509	0	0	0	550.1	542	273	292	87	117	14	0	2	2,301	11	8.32	4.35	1.42	22.1	5.1	1.20	.289	4.78	110	4.08	96	8.86	9.5