Tommy John played the most seasons with fewer than 5.00 BB/9, with 26 seasons.

Interpreted as:

most years by a player with <5 bb/9

	NAME	SEAS	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	Tommy John T. John	26	2.41	760	288	231	.555	700	3.34	2,245	162	46	3	4710.1	4,783	1,749	2,017	302	1,259	98	22	102	19,692	187	4.29	1.78	0.58	11.4	6.4	1.28	.284	3.85	90	3.37	89	9.14	208.3
2	Jamie Moyer J. Moyer	25	2.55	696	269	209	.563	638	4.25	2,441	33	10	0	4074.0	4,231	1,926	2,076	522	1,155	146	15	69	17,356	57	5.39	2.11	1.15	14.1	6.7	1.32	.283	4.59	97	4.46	102	9.35	-33.5
3	Roger Clemens R. Clemens	24	2.89	709	354	184	.658	707	3.12	4,672	118	46	0	4916.2	4,185	1,707	1,885	363	1,580	159	0	63	20,240	143	8.55	2.96	0.66	23.1	7.8	1.17	.284	3.45	70	3.08	71	7.66	680.4
4	Dennis Eckersley D. Eckersley	24	2.02	1,071	197	171	.535	361	3.50	2,401	100	20	390	3285.2	3,076	1,278	1,382	347	738	75	577	91	13,534	28	6.58	3.25	0.95	17.7	5.5	1.16	.274	3.79	86	3.40	85	8.43	224.9
5	Phil Niekro P. Niekro	24	3.01	864	318	274	.537	716	3.35	3,342	245	45	29	5404.0	5,044	2,012	2,337	482	1,809	123	83	86	22,677	226	5.57	1.85	0.80	14.7	8.0	1.27	.270	3.89	87	3.61	95	8.40	116.1
6	Greg Maddux G. Maddux	23	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
7	Don Sutton D. Sutton	23	2.29	774	324	256	.559	756	3.26	3,574	178	58	5	5282.1	4,692	1,914	2,104	472	1,343	82	12	102	21,631	112	6.09	2.66	0.80	16.5	6.2	1.14	.261	3.58	92	3.23	90	7.99	181.2
8	Jim Kaat J. Kaat	23	2.11	882	282	230	.551	614	3.42	2,434	180	31	17	4475.1	4,565	1,700	1,990	386	1,048	115	100	114	18,766	126	4.89	2.32	0.78	13.0	5.6	1.25	.283	4.00	93	3.38	90	9.18	177.1
9	Early Wynn E. Wynn	23	3.50	691	300	244	.551	611	3.54	2,334	289	49	16	4564.0	4,291	1,796	2,037	338	1,775	64	67	36	19,408	51	4.60	1.31	0.67	12.0	9.1	1.33	.265	4.02	94	3.64	97	8.46	56.4
10	Jack Quinn J. Quinn	23	1.97	756	247	218	.531	443	3.29	1,329	243	28	56	3920.1	4,238	1,433	1,837	103	860	91	218		16,356	62	3.05	1.55	0.24	8.1	5.3	1.30	.296	4.22	89	3.17	87	9.73	217.4
11	Dennis Martinez D. Martinez	22	2.59	683	244	188	.565	553	3.65	2,132	122	30	8	3950.2	3,832	1,601	1,789	364	1,136	115	51	70	16,515	83	4.86	1.88	0.83	12.9	6.9	1.26	.272	4.08	93	3.87	98	8.73	28.6
12	Bert Blyleven B. Blyleven	22	2.39	692	287	250	.534	685	3.31	3,701	242	60	0	4970.0	4,632	1,830	2,029	430	1,322	155	3	71	20,491	114	6.70	2.80	0.78	18.1	6.5	1.20	.282	3.67	85	3.18	82	8.39	368.6
13	Jerry Reuss J. Reuss	22	2.76	628	220	191	.535	547	3.64	1,907	127	39	11	3669.2	3,734	1,483	1,700	245	1,127	59	41	118	15,582	107	4.68	1.69	0.60	12.2	7.2	1.32	.285	4.17	100	3.45	95	9.16	68.4
14	Steve Carlton S. Carlton	22	3.07	693	322	222	.592	672	3.14	3,997	251	55	1	4973.2	4,423	1,733	1,976	384	1,694	49	8	142	20,589	173	7.23	2.36	0.69	19.4	8.2	1.23	.279	3.58	86	3.05	85	8.00	295.1
15	Gaylord Perry G. Perry	22	2.32	777	314	265	.542	690	3.11	3,534	303	53	10	5350.0	4,938	1,846	2,128	399	1,379	108	33	164	21,953	160	5.95	2.56	0.67	16.1	6.3	1.18	.275	3.58	85	3.06	85	8.31	312.9
16	Red Ruffing R. Ruffing	22	3.19	624	273	225	.548	538	3.80	1,987	335	45	18	4344.0	4,284	1,833	2,115	254	1,541	58	69		18,546	46	4.12	1.29	0.53	10.7	8.3	1.34	.274	4.38	91	3.93	95	8.88	82.3
17	Cy Young C. Young	22	1.49	906	511	316	.618	815	2.63	2,803	749	76	17	7356.0	7,092	2,147	3,167	138	1,217	161	84		29,565	156	3.43	2.30	0.17	9.5	4.1	1.13	.275	3.87	74	2.84	79	8.68	620
18	Bartolo Colon B. Colon	21	2.46	565	247	188	.568	552	4.12	2,535	38	13	0	3461.2	3,593	1,584	1,719	439	948	64	2	47	14,655	45	6.59	2.67	1.14	17.3	6.5	1.31	.296	4.47	95	4.14	96	9.34	71.6
19	John Smoltz J. Smoltz	21	2.62	723	213	155	.579	481	3.33	3,084	53	16	154	3473.0	3,074	1,284	1,391	288	1,010	57	204	84	14,271	145	7.99	3.05	0.75	21.6	7.1	1.18	.283	3.60	81	3.23	78	7.97	356.6
20	David Wells D. Wells	21	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
21	Danny Darwin D. Darwin	21	2.61	716	171	182	.484	371	3.84	1,942	53	9	32	3016.2	2,951	1,286	1,431	321	874	81	171	101	12,716	52	5.79	2.22	0.96	15.3	6.9	1.27	.277	4.27	95	3.89	97	8.80	25.3
22	Rick Honeycutt R. Honeycutt	21	2.74	797	109	143	.433	268	3.72	1,038	47	11	38	2160.0	2,183	893	1,034	185	657	50	118	81	9,141	45	4.33	1.58	0.77	11.4	7.2	1.31	.277	4.31	96	3.89	99	9.10	10
23	Frank Tanana F. Tanana	21	2.70	638	240	236	.504	616	3.66	2,773	143	34	1	4188.1	4,063	1,704	1,910	448	1,255	129	10	116	17,641	119	5.96	2.21	0.96	15.7	7.1	1.27	.277	4.10	94	3.78	96	8.73	66.4
24	Rich Gossage R. Gossage	21	3.55	982	124	103	.546	33	2.88	1,469	15	0	310	1759.2	1,440	564	626	110	695	44	677	88	7,275	57	7.51	2.11	0.56	20.2	9.6	1.21	.268	3.20	78	3.10	82	7.37	136.8
25	Joe Niekro J. Niekro	21	3.16	697	220	203	.520	498	3.57	1,740	107	29	16	3572.2	3,450	1,418	1,607	274	1,253	65	91	71	15,107	170	4.38	1.39	0.69	11.5	8.3	1.32	.270	4.05	102	3.78	107	8.69	-106.5