who has the lowest era ever with a minimum of 100 ip

Al Spalding has the best career ERA when pitching at least 100 innings, with an ERA of 1.78.

	NAME	ERA	IP	G	W	L	W%	GS	SO	CG	SHO	SV	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	Al Spalding A. Spalding	1.78	539.2	65	48	12	.800	61	41	53	8	1	559	107	238	6	26		4		2,272	1	0.68	0.43	1.58	0.10	1.8	1.1	1.08		3.97	74	2.38	99	9.32	9.6
2	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
3	Emmanuel Clase E. Clase	1.84	347.1	354	20	23	.465	1	338	0	0	176	262	71	106	14	68	8	286	10	1,372	18	8.76	1.76	4.97	0.36	24.6	5.0	0.95	.263	2.75	44	2.40	58	6.79	67.2
4	Charlie Hodnett C. Hodnett	1.88	153.0	18	14	4	.778	18	47	15	1	0	149	32	66	1	23		0		647	10	2.76	1.35	2.04	0.06	7.3	3.6	1.12		3.88	63	3.19	117	8.76	-8.8
5	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
6	Jim Devlin J. Devlin	1.89	1181.0	129	65	60	.520	129	263	127	9	0	1,183	248	597	7	78		0		4,896	34	2.00	0.59	3.37	0.05	5.4	1.6	1.07		4.55	67	2.35	84	9.02	88.9
7	Perry Werden P. Werden	1.97	141.1	16	12	1	.923	16	51	12	1	0	113	31	61	1	22		0		575	5	3.25	1.40	2.32	0.06	8.9	3.8	0.96		3.88	67	3.11	121	7.20	-10
8	Félix Bautista F. Bautista	1.98	154.1	149	12	7	.632	0	236	0	0	64	82	34	40	13	66	3	100	1	603	10	13.76	3.85	3.58	0.76	39.1	10.9	0.96	.242	2.33	50	2.53	64	4.78	25.8
9	Jack Pfiester J. Pfiester	2.02	1067.1	149	71	44	.617	128	503	75	17	0	869	240	365	6	293	39	12		4,236	16	4.24	2.47	1.72	0.05	11.9	6.9	1.09	.254	3.08	77	2.32	86	7.33	44.3
10	Joe Wood J. Wood	2.03	1434.1	225	117	57	.672	158	989	121	28	10	1,138	324	497	10	421	49	56		5,640	43	6.21	2.64	2.35	0.06	17.5	7.5	1.09	.270	3.12	70	2.26	78	7.14	105.8
11	Paul Skenes P. Skenes	2.03	239.0	40	15	10	.600	40	280	1	0	0	161	54	59	15	61	8	0	0	923	4	10.54	2.30	4.59	0.56	30.3	6.6	0.93	.261	2.22	48	2.46	61	6.06	42.1
12	Cade Smith C. Smith	2.05	109.2	110	8	3	.727	0	156	0	0	4	78	25	27	1	30	5	7	1	434	1	12.80	2.46	5.20	0.08	35.9	6.9	0.98	.318	2.22	52	1.36	34	6.40	32.9
13	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
14	Chick Brandom C. Brandom	2.08	108.0	32	3	1	.750	4	44	2	0	3	101	25	53	0	29	3	20		415	1	3.67	2.42	1.52	0.00	10.6	7.0	1.20	.298	4.42	74	2.36	87	8.42	3.8
15	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
16	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
17	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
18	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
19	Devin Williams D. Williams	2.17	265.0	274	29	12	.707	0	412	0	0	78	153	64	81	16	124	15	113	3	1,078	15	13.99	4.21	3.32	0.54	38.2	11.5	1.05	.268	2.75	52	2.41	57	5.20	53.8
20	Glenn Liebhardt G. Liebhardt	2.17	612.2	90	36	35	.507	66	280	49	7	2	543	148	225	3	183	14	23		2,419	21	4.11	2.69	1.53	0.04	11.6	7.6	1.18	.278	3.31	89	2.27	98	7.98	1.6
21	Mellie Wolfgang M. Wolfgang	2.18	326.0	77	15	14	.517	27	111	15	3	0	268	79	115	3	95	4	37		1,269	3	3.06	2.62	1.17	0.08	8.7	7.5	1.11	.251	3.17	79	2.72	97	7.40	3
22	Carson Smith C. Smith	2.21	102.0	108	4	6	.400	0	129	0	0	14	74	25	27	4	34	7	31	4	415	6	11.38	3.00	3.79	0.35	31.1	8.2	1.06	.290	2.38	55	2.32	58	6.53	19.3
23	Mariano Rivera M. Rivera	2.21	1283.2	1,115	82	60	.577	10	1,173	0	0	652	998	315	340	71	286	46	952	41	5,103	13	8.22	2.01	4.10	0.50	23.0	5.6	1.00	.263	2.38	49	2.76	61	7.00	246.7
24	Erv Lange E. Lange	2.23	190.0	36	12	11	.522	22	87	10	2	2	162	47	69	3	55	3	11		781	1	4.12	2.61	1.58	0.14	11.1	7.0	1.14	.251	3.27	74	2.64	96	7.67	1.2
25	Jake Weimer J. Weimer	2.23	1472.2	191	97	69	.584	180	657	143	21	2	1,227	365	511	14	493	73	9		5,971	26	4.02	3.01	1.33	0.09	11.0	8.3	1.17	.256	3.12	81	2.81	98	7.50	8.7