Nolan Ryan and Tommy John were tied for playing the most seasons with an ERA of 1.70 or worse, with 26 seasons.

Interpreted as:

most seasons with 1.7 or higher era by a pitcher

	NAME	SEAS	ERA	G	W	L	W%	GS	SO	CG	SHO	SV	IP	H	ER	R	HR	BB	HBP	GF	IBB	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	ERA-	FIP	FIP-	H/9	PRAA
1	Nolan Ryan N. Ryan	26	3.24	786	313	287	.522	752	5,574	217	58	3	5237.0	3,824	1,883	2,144	319	2,727	157	13	77	21,970	261	9.58	4.69	2.04	0.55	25.4	12.4	1.25	.266	3.68	91	2.98	84	6.57	353.7
2	Tommy John T. John	26	3.34	760	288	231	.555	700	2,245	162	46	3	4710.1	4,783	1,749	2,017	302	1,259	98	22	102	19,692	187	4.29	2.41	1.78	0.58	11.4	6.4	1.28	.284	3.85	90	3.37	89	9.14	208.3
3	Jamie Moyer J. Moyer	25	4.25	696	269	209	.563	638	2,441	33	10	0	4074.0	4,231	1,926	2,076	522	1,155	146	15	69	17,356	57	5.39	2.55	2.11	1.15	14.1	6.7	1.32	.283	4.59	97	4.46	102	9.35	-33.5
4	Charlie Hough C. Hough	25	3.75	858	216	216	.500	440	2,362	107	13	61	3801.1	3,283	1,582	1,807	383	1,665	174	240	44	16,170	179	5.59	3.94	1.42	0.91	14.6	10.3	1.30	.250	4.28	95	4.28	109	7.77	-142.3
5	Jim Kaat J. Kaat	25	3.45	898	283	237	.544	625	2,461	180	31	17	4530.1	4,620	1,738	2,038	395	1,083	122	102	116	19,023	128	4.89	2.15	2.27	0.78	12.9	5.7	1.26	.282	4.05	93	3.41	91	9.18	165.8
6	Roger Clemens R. Clemens	24	3.12	709	354	184	.658	707	4,672	118	46	0	4916.2	4,185	1,707	1,885	363	1,580	159	0	63	20,240	143	8.55	2.89	2.96	0.66	23.1	7.8	1.17	.284	3.45	70	3.08	71	7.66	680.4
7	Steve Carlton S. Carlton	24	3.22	741	329	244	.574	709	4,136	254	55	2	5217.2	4,672	1,864	2,130	414	1,833	53	13	150	21,683	183	7.13	3.16	2.26	0.71	19.1	8.5	1.25	.279	3.67	87	3.14	86	8.06	271.5
8	Phil Niekro P. Niekro	24	3.35	864	318	274	.537	716	3,342	245	45	29	5404.0	5,044	2,012	2,337	482	1,809	123	83	86	22,677	226	5.57	3.01	1.85	0.80	14.7	8.0	1.27	.270	3.89	87	3.61	95	8.40	116.1
9	Dennis Martinez D. Martinez	23	3.70	692	245	193	.559	562	2,149	122	30	8	3999.2	3,897	1,643	1,835	372	1,165	122	51	71	16,754	83	4.84	2.62	1.84	0.84	12.8	7.0	1.27	.272	4.13	94	3.91	99	8.77	17
10	Don Sutton D. Sutton	23	3.26	774	324	256	.559	756	3,574	178	58	5	5282.1	4,692	1,914	2,104	472	1,343	82	12	102	21,631	112	6.09	2.29	2.66	0.80	16.5	6.2	1.14	.261	3.58	92	3.23	90	7.99	181.2
11	Jack Quinn J. Quinn	23	3.29	756	247	218	.531	443	1,329	243	28	56	3920.1	4,238	1,433	1,837	103	860	91	218		16,356	62	3.05	1.97	1.55	0.24	8.1	5.3	1.30	.296	4.22	89	3.17	87	9.73	217.4
12	Randy Johnson R. Johnson	22	3.29	618	303	166	.646	603	4,875	100	37	2	4135.1	3,346	1,513	1,703	411	1,497	190	7	37	17,067	109	10.61	3.26	3.26	0.89	28.6	8.8	1.17	.291	3.71	75	3.18	73	7.28	554.3
13	Tom Glavine T. Glavine	22	3.54	682	305	203	.600	682	2,607	56	25	0	4413.1	4,298	1,734	1,900	356	1,500	66	0	145	18,604	65	5.32	3.06	1.74	0.73	14.0	8.1	1.31	.280	3.87	86	3.94	94	8.76	120.1
14	Jesse Orosco J. Orosco	22	3.34	1,182	74	72	.507	4	1,077	0	0	126	1168.0	966	434	481	108	537	33	455	77	4,959	39	8.30	4.14	2.01	0.83	21.7	10.8	1.29	.268	3.71	84	3.70	93	7.44	39.1
15	Mike Morgan M. Morgan	22	4.23	597	141	186	.431	411	1,403	46	10	8	2772.1	2,943	1,303	1,431	270	938	73	56	77	11,872	105	4.55	3.05	1.50	0.88	11.8	7.9	1.40	.291	4.65	102	4.26	103	9.55	-36.8
16	Dennis Eckersley D. Eckersley	22	3.60	957	189	169	.528	361	2,273	100	20	309	3154.2	3,003	1,263	1,363	340	731	74	470	90	13,066	28	6.48	2.09	3.11	0.97	17.4	5.6	1.18	.276	3.89	89	3.47	86	8.57	194.7
17	Bert Blyleven B. Blyleven	22	3.31	692	287	250	.534	685	3,701	242	60	0	4970.0	4,632	1,830	2,029	430	1,322	155	3	71	20,491	114	6.70	2.39	2.80	0.78	18.1	6.5	1.20	.282	3.67	85	3.18	82	8.39	368.6
18	Joe Niekro J. Niekro	22	3.59	702	221	204	.520	500	1,747	107	29	16	3584.1	3,466	1,431	1,620	276	1,262	65	93	71	15,166	172	4.39	3.17	1.38	0.69	11.5	8.3	1.32	.270	4.07	102	3.79	107	8.70	-109.2
19	Gaylord Perry G. Perry	22	3.11	777	314	265	.542	690	3,534	303	53	10	5350.0	4,938	1,846	2,128	399	1,379	108	33	164	21,953	160	5.95	2.32	2.56	0.67	16.1	6.3	1.18	.275	3.58	85	3.06	85	8.31	312.9
20	Early Wynn E. Wynn	22	3.56	686	297	243	.550	606	2,319	285	49	16	4524.0	4,256	1,789	2,023	337	1,765	64	67	36	19,241	51	4.61	3.51	1.31	0.67	12.1	9.2	1.33	.266	4.02	95	3.64	97	8.47	52.1
21	Red Ruffing R. Ruffing	22	3.80	624	273	225	.548	538	1,987	335	45	18	4344.0	4,284	1,833	2,115	254	1,541	58	69		18,546	46	4.12	3.19	1.29	0.53	10.7	8.3	1.34	.274	4.38	91	3.93	95	8.88	82.3
22	Sad Sam Jones S. Sam Jones	22	3.84	647	229	217	.513	487	1,223	250	36	31	3883.0	4,084	1,656	2,008	151	1,396	69	116		16,662	73	2.83	3.24	0.88	0.35	7.3	8.4	1.41	.285	4.65	98	3.93	101	9.47	-7.5
23	Herb Pennock H. Pennock	22	3.60	617	241	162	.598	419	1,227	249	35	37	3571.2	3,900	1,428	1,699	128	916	36	135		15,096	65	3.09	2.31	1.34	0.32	8.1	6.1	1.35	.295	4.28	95	3.50	93	9.83	113.6
24	Bartolo Colon B. Colon	21	4.12	565	247	188	.568	552	2,535	38	13	0	3461.2	3,593	1,584	1,719	439	948	64	2	47	14,655	45	6.59	2.46	2.67	1.14	17.3	6.5	1.31	.296	4.47	95	4.14	96	9.34	71.6
25	LaTroy Hawkins L. Hawkins	21	4.31	1,042	75	94	.444	98	983	2	0	127	1467.1	1,607	702	763	163	456	21	373	35	6,323	70	6.03	2.80	2.16	1.00	15.5	7.2	1.41	.307	4.68	94	4.17	94	9.86	38.8