Ed Walsh has the best career ERA, with an ERA of 1.82.

Interpreted as:

lowest era with a minimum of 1500 IP by a player in MLB history

	NAME	ERA	IP	G	W	L	W%	GS	SO	CG	SHO	SV	H	ER	R	HR	BB	HBP	GF	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	ERA-	FIP	FIP-	H/9	PRAA
1	Ed Walsh E. Walsh	1.82	2964.1	430	195	126	.607	315	1,736	250	57	35	2,346	598	873	23	617	52	105	11,413	76	5.27	1.87	2.81	0.07	15.2	5.4	1.00	.259	2.65	69	2.02	79	7.12	164.3
2	Addie Joss A. Joss	1.89	2327.0	286	160	97	.623	260	920	234	45	5	1,888	488	730	19	364	58	22	8,891	28	3.56	1.41	2.53	0.07	10.3	4.1	0.97	.248	2.82	70	2.25	86	7.30	88.8
3	Mordecai Brown M. Brown	2.06	3172.1	481	239	130	.648	332	1,375	271	55	49	2,708	725	1,044	43	673	61	138	12,422	61	3.90	1.91	2.04	0.12	11.1	5.4	1.07	.259	2.96	71	2.42	83	7.68	161.9
4	John Ward J. Ward	2.10	2469.2	293	164	103	.614	262	920	245	24	3	2,324	576	1,185	26	253		32	10,164	144	3.35	0.92	3.64	0.09	9.1	2.5	1.04		4.32	82	2.43	96	8.47	9.1
5	Christy Mathewson C. Mathewson	2.13	4788.2	636	373	188	.665	552	2,507	435	79	30	4,219	1,135	1,620	89	848	59	73	18,913	115	4.71	1.59	2.96	0.17	13.3	4.5	1.06	.268	3.04	75	2.26	76	7.93	363
6	Rube Waddell R. Waddell	2.16	2961.1	407	193	143	.574	340	2,316	261	50	5	2,460	711	1,063	37	803	115	54	11,717	74	7.04	2.44	2.88	0.11	19.8	6.9	1.10	.287	3.23	75	2.03	71	7.48	262
7	Walter Johnson W. Johnson	2.17	5914.1	802	417	279	.599	666	3,509	531	110	34	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
8	Tommy Bond T. Bond	2.25	2779.2	322	193	115	.627	314	860	294	35	0	2,857	695	1,339	32	178		11	11,386	120	2.78	0.58	4.83	0.10	7.6	1.6	1.09	.274	4.34	89	2.38	95	9.25	32.3
9	Orval Overall O. Overall	2.26	1535.1	218	108	71	.603	182	935	133	30	12	1,232	385	520	16	551	45	30	6,145	57	5.48	3.23	1.70	0.09	15.2	9.0	1.16	.264	3.05	81	2.39	85	7.22	72.4
10	Will White W. White	2.28	3542.2	403	229	166	.580	402	1,041	394	36	0	3,440	896	1,844	65	496		1	14,951	221	2.64	1.26	2.10	0.17	7.0	3.3	1.11	.254	4.68	83	2.98	108	8.74	-109.3
11	Ed Reulbach E. Reulbach	2.28	2632.1	399	182	106	.632	300	1,137	200	40	13	2,117	668	887	33	892	107	80	10,521	49	3.89	3.05	1.27	0.11	10.8	8.5	1.14	.250	3.03	80	2.84	99	7.24	9
12	Jim Scott J. Scott	2.30	1892.0	317	107	114	.484	226	945	123	26	9	1,624	483	686	21	609	53	63	7,487	32	4.50	2.90	1.55	0.10	12.6	8.1	1.18	.274	3.26	85	2.63	96	7.73	21.2
13	Eddie Plank E. Plank	2.35	4495.2	623	326	194	.627	529	2,246	410	69	23	3,958	1,174	1,566	42	1,072	190	77	17,803	88	4.50	2.15	2.10	0.08	12.6	6.0	1.12	.275	3.14	81	2.45	86	7.92	195.2
14	Larry Corcoran L. Corcoran	2.36	2392.1	277	177	89	.665	268	1,103	256	22	2	2,147	626	1,235	68	496	2	9	10,001	113	4.15	1.87	2.22	0.26	11.0	5.0	1.10	.250	4.65	79	2.99	97	8.08	41
15	Eddie Cicotte E. Cicotte	2.38	3226.0	502	209	148	.585	361	1,374	249	35	24	2,897	853	1,161	32	827	52	107	12,731	57	3.83	2.31	1.66	0.09	10.8	6.5	1.15	.274	3.24	82	2.54	88	8.08	131.9
16	George McQuillan G. McQuillan	2.38	1576.1	273	85	89	.489	173	590	105	17	14	1,382	417	578	23	401	30	76	6,255	16	3.37	2.29	1.47	0.13	9.4	6.4	1.13	.261	3.30	87	2.58	93	7.89	31.1
17	Ed Killian E. Killian	2.38	1598.1	214	103	78	.569	180	516	149	22	4	1,463	423	585	9	482	70	31	6,508	22	2.91	2.71	1.07	0.05	7.9	7.4	1.22	.268	3.29	91	2.80	110	8.24	-41.2
18	Doc White D. White	2.39	3041.0	427	189	156	.548	363	1,384	262	45	5	2,738	808	1,118	33	670	120	53	12,093	63	4.10	1.98	2.07	0.10	11.4	5.5	1.12	.274	3.31	89	2.51	96	8.10	22.9
19	Nap Rucker N. Rucker	2.42	2375.1	336	134	134	.500	274	1,217	186	38	14	2,089	639	823	41	701	73	58	9,441	43	4.61	2.66	1.74	0.16	12.9	7.4	1.17	.276	3.12	86	2.60	90	7.92	73.7
20	Jeff Tesreau J. Tesreau	2.43	1679.0	247	119	72	.623	207	880	123	27	9	1,350	453	591	37	572	38	25	6,805	42	4.72	3.07	1.54	0.20	12.9	8.4	1.14	.249	3.17	89	2.79	99	7.24	2.5
21	Jim McCormick J. McCormick	2.43	4275.2	492	265	214	.553	485	1,704	466	33	1	4,092	1,155	2,095	82	749	12	7	17,702	160	3.59	1.58	2.28	0.17	9.6	4.2	1.13	.265	4.41	86	2.88	100	8.61	-32.7
22	Terry Larkin T. Larkin	2.43	1567.1	176	89	80	.527	176	406	172	9	0	1,627	424	922	12	124		0	6,659	84	2.33	0.71	3.27	0.07	6.1	1.9	1.12		5.29	97	2.52	100	9.34	-7.4
23	Chief Bender C. Bender	2.46	3017.0	459	212	127	.625	334	1,711	255	40	34	2,645	823	1,108	40	712	102	112	11,895	79	5.10	2.12	2.40	0.12	14.4	6.0	1.11	.279	3.31	88	2.29	83	7.89	145.9
24	Hooks Wiltse H. Wiltse	2.47	2112.1	357	139	90	.607	225	965	152	27	33	1,892	580	787	54	498	40	109	8,413	41	4.11	2.12	1.94	0.23	11.5	5.9	1.13	.268	3.35	89	2.56	90	8.06	70.5
25	Sam Leever S. Leever	2.47	2660.2	388	194	100	.660	299	847	241	39	13	2,449	731	1,023	29	587	88	75	10,662	46	2.87	1.99	1.44	0.10	7.9	5.5	1.14	.266	3.46	81	2.84	92	8.28	74.2