Ed Walsh has the lowest career ERA when starting 100+ games, with an ERA of 1.82.

Interpreted as:

lowest era by a player after 100 or more career starts

	NAME	ERA	GS	G	W	L	W%	SO	CG	SHO	SV	IP	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	315	430	195	126	.607	1,736	250	57	35	2964.1	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	260	286	160	97	.623	920	234	45	5	2327.0	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	Jim Devlin J. Devlin	1.89	129	129	65	60	.520	263	127	9	0	1181.0	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
4	Jack Pfiester J. Pfiester	2.02	128	149	71	44	.617	503	75	17	0	1067.1	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
5	Joe Wood J. Wood	2.03	158	225	117	57	.672	989	121	28	10	1434.1	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
6	Mordecai Brown M. Brown	2.06	332	481	239	130	.648	1,375	271	55	49	3172.1	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
7	John Ward J. Ward	2.10	262	293	164	103	.614	920	245	24	3	2469.2	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
8	Christy Mathewson C. Mathewson	2.13	552	636	373	188	.665	2,507	435	79	30	4788.2	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
9	Rube Waddell R. Waddell	2.16	340	407	193	143	.574	2,316	261	50	5	2961.1	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
10	Walter Johnson W. Johnson	2.17	666	802	417	279	.599	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
11	Jake Weimer J. Weimer	2.23	180	191	97	69	.584	657	143	21	2	1472.2	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
12	Tommy Bond T. Bond	2.25	314	322	193	115	.627	860	294	35	0	2779.2	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
13	Orval Overall O. Overall	2.26	182	218	108	71	.603	935	133	30	12	1535.1	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
14	Will White W. White	2.28	402	403	229	166	.580	1,041	394	36	0	3542.2	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
15	Babe Ruth B. Ruth	2.28	147	163	94	46	.671	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
16	Ed Reulbach E. Reulbach	2.28	300	399	182	106	.632	1,137	200	40	13	2632.1	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
17	Jim Scott J. Scott	2.30	226	317	107	114	.484	945	123	26	9	1892.0	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
18	Reb Russell R. Russell	2.33	148	242	80	59	.576	495	81	24	13	1291.2	1,128	335	453	7	267	18	60	5,021	21	3.45	1.86	1.85	0.05	9.9	5.3	1.08	.265	3.16	84	2.35	83	7.86	68.6
19	Andy Coakley A. Coakley	2.35	124	150	58	59	.496	428	87	11	3	1072.1	1,021	280	436	9	314	26	24	4,326	15	3.59	2.64	1.36	0.08	9.9	7.3	1.24	.285	3.66	89	2.58	96	8.57	14.6
20	Eddie Plank E. Plank	2.35	529	623	326	194	.627	2,246	410	69	23	4495.2	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
21	Larry Corcoran L. Corcoran	2.36	268	277	177	89	.665	1,103	256	22	2	2392.1	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
22	Rube Foster R. Foster	2.36	103	138	58	33	.637	294	60	15	3	842.1	726	221	302	6	305	29	27	3,359	19	3.14	3.26	0.96	0.06	8.8	9.1	1.22	.264	3.23	86	2.97	107	7.76	-20
23	Eddie Cicotte E. Cicotte	2.38	361	502	209	148	.585	1,374	249	35	24	3226.0	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
24	George McQuillan G. McQuillan	2.38	173	273	85	89	.489	590	105	17	14	1576.1	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
25	Ed Killian E. Killian	2.38	180	214	103	78	.569	516	149	22	4	1598.1	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