Honus Wagner had the best ERA when playing 20+ seasons, with an ERA of 0.00.

Interpreted as:

best pitcher twenty or more years

	NAME	ERA	SEAS	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	Honus Wagner H. Wagner	0.00	21	2	0	0		0	6	0	0	0	8.1	7	0	5	0	6	0	2		37	3	6.48	6.48	1.00	0.00	16.2	16.2	1.56	.280	5.40	0	3.44	103	7.56	-0.3
2	Jimmie Foxx J. Foxx	1.52	20	10	1	0	1.000	2	11	0	0	0	23.2	13	4	4	0	14	1	8		97	0	4.18	5.32	0.79	0.00	11.3	14.4	1.14	.183	1.52	40	3.53	96	4.94	0.4
3	Walter Johnson W. Johnson	2.17	21	802	417	279	.599	666	3,509	531	110	34	5914.1	4,913	1,424	1,902	97	1,363	205	127		23,405	154	5.34	2.07	2.57	0.15	15.0	5.8	1.06	.264	2.89	68	2.42	76	7.48	472.8
4	Babe Ruth B. Ruth	2.28	22	163	94	46	.671	147	488	107	17	4	1221.1	974	309	400	10	441	29	12		4,896	25	3.60	3.25	1.11	0.07	10.0	9.0	1.16	.245	2.95	82	2.81	100	7.18	-6.6
5	Sam Rice S. Rice	2.52	20	9	1	1	.500	3	12	1	0	0	39.1	31	11	18	0	19	0	4		156	1	2.75	4.35	0.63	0.00	7.7	12.2	1.27	.248	4.12	89	3.20	112	7.09	-1.6
6	Hoyt Wilhelm H. Wilhelm	2.52	21	1,070	143	122	.540	52	1,610	20	5	228	2254.1	1,757	632	773	150	778	62	651	61	9,164	90	6.43	3.11	2.07	0.60	17.6	8.5	1.12	.245	3.09	68	3.06	82	7.01	167.6
7	Grover Alexander G. Alexander	2.56	20	696	373	208	.642	600	2,198	436	90	32	5190.0	4,868	1,476	1,852	165	951	70	81		20,893	38	3.81	1.65	2.31	0.29	10.5	4.6	1.12	.269	3.21	73	2.88	81	8.44	359.1
8	Cy Young C. Young	2.63	22	906	511	316	.618	815	2,803	749	76	17	7356.0	7,092	2,147	3,167	138	1,217	161	84		29,565	156	3.43	1.49	2.30	0.17	9.5	4.1	1.13	.275	3.87	74	2.84	79	8.68	620
9	Tom Seaver T. Seaver	2.86	20	656	311	205	.603	647	3,640	231	61	1	4783.0	3,971	1,521	1,674	380	1,390	76	6	116	19,369	126	6.85	2.62	2.62	0.72	18.8	7.2	1.12	.259	3.15	79	3.03	85	7.47	286.1
10	John Franco J. Franco	2.89	21	1,119	90	87	.508	0	975	0	0	424	1245.2	1,166	400	466	81	495	22	774	78	5,312	54	7.04	3.58	1.97	0.59	18.4	9.3	1.33	.290	3.37	73	3.44	86	8.42	76
11	Rich Gossage R. Gossage	3.01	22	1,002	124	107	.537	37	1,502	16	0	310	1809.1	1,497	605	670	119	732	47	681	90	7,507	63	7.47	3.64	2.05	0.59	20.0	9.8	1.23	.270	3.33	81	3.18	84	7.45	125.4
12	Warren Spahn W. Spahn	3.09	21	750	363	245	.597	665	2,583	382	63	28	5243.2	4,830	1,798	2,016	434	1,434	42	67	60	21,547	81	4.43	2.46	1.80	0.74	12.0	6.7	1.19	.258	3.46	84	3.44	94	8.29	124.4
13	Gaylord Perry G. Perry	3.11	22	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
14	Roger Clemens R. Clemens	3.12	24	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
15	Eppa Rixey E. Rixey	3.15	21	692	266	251	.515	554	1,350	290	37	14	4494.2	4,633	1,572	1,986	93	1,082	76	99		18,754	97	2.70	2.17	1.25	0.19	7.2	5.8	1.27	.281	3.98	88	3.29	91	9.28	162.7
16	Red Faber R. Faber	3.15	20	669	254	213	.544	483	1,471	273	29	27	4086.2	4,106	1,430	1,813	111	1,213	103	134		17,104	52	3.24	2.67	1.21	0.24	8.6	7.1	1.30	.281	3.99	84	3.43	93	9.04	124.6
17	Greg Maddux G. Maddux	3.16	23	744	355	227	.610	740	3,371	109	35	0	5008.1	4,726	1,756	1,981	353	999	137	3	177	20,421	70	6.06	1.80	3.37	0.63	16.5	4.9	1.14	.281	3.56	76	3.25	78	8.49	519.5
18	Jesse Orosco J. Orosco	3.16	24	1,252	87	80	.521	4	1,179	0	0	144	1295.1	1,055	455	512	113	581	34	501	86	5,460	40	8.19	4.04	2.03	0.79	21.6	10.6	1.26	.265	3.56	80	3.60	91	7.33	52.1
19	Nolan Ryan N. Ryan	3.19	27	807	324	292	.526	773	5,714	222	61	3	5386.0	3,923	1,911	2,178	321	2,795	158	13	78	22,575	277	9.55	4.67	2.04	0.54	25.3	12.4	1.25	.265	3.64	90	2.96	83	6.56	370.2
20	Steve Carlton S. Carlton	3.22	24	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
21	Dolf Luque D. Luque	3.24	20	550	194	179	.520	367	1,130	206	26	29	3220.1	3,231	1,161	1,412	113	918	26	128		13,470	50	3.16	2.57	1.23	0.32	8.4	6.8	1.29	.276	3.95	87	3.62	96	9.03	56.4
22	Dutch Leonard D. Leonard	3.25	20	640	191	181	.513	375	1,170	192	30	45	3218.1	3,304	1,162	1,432	158	737	56	171		13,487	97	3.27	2.06	1.59	0.44	8.7	5.5	1.26	.277	4.00	84	3.34	86	9.24	186.6
23	Don Sutton D. Sutton	3.26	23	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
24	Jack Quinn J. Quinn	3.29	23	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
25	Randy Johnson R. Johnson	3.29	22	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