what pitcher has lowest career era with minimum 400 games started

Christy Mathewson has the best career ERA when starting 400+ games, with an ERA of 2.13.

	NAME	ERA	GS	G	W	L	W%	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	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
2	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
3	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
4	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
5	Jim McCormick J. McCormick	2.43	485	492	265	214	.553	1,704	466	33	1	4275.2	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
6	Clayton Kershaw C. Kershaw	2.51	432	435	212	94	.693	2,974	25	15	0	2753.2	2,102	768	841	228	684	44	1	28	10,863	103	9.72	2.24	4.35	0.75	27.4	6.3	1.01	.270	2.75	64	2.83	70	6.87	365.9
7	Grover Alexander G. Alexander	2.56	600	696	373	208	.642	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	815	906	511	316	.618	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	Tim Keefe T. Keefe	2.63	594	600	342	225	.603	2,564	554	39	2	5049.2	4,438	1,474	2,470	75	1,233	83	7		20,941	240	4.57	2.20	2.08	0.13	12.2	5.9	1.12	.257	4.40	79	2.92	87	7.91	239.2
10	Vic Willis V. Willis	2.63	471	513	249	205	.548	1,651	388	50	11	3996.0	3,621	1,167	1,620	66	1,212	156	41		16,263	94	3.72	2.73	1.36	0.15	10.2	7.5	1.21	.270	3.65	86	2.96	95	8.16	82
11	Old Hoss Radbourn O. Hoss Radbourn	2.68	502	527	309	194	.614	1,830	488	35	3	4527.1	4,328	1,347	2,273	118	875	54	24		18,918	214	3.64	1.74	2.09	0.23	9.7	4.6	1.15	.262	4.52	82	3.15	95	8.60	51
12	Mickey Welch M. Welch	2.71	549	565	307	210	.594	1,850	525	41	4	4802.0	4,588	1,447	2,556	106	1,297	52	16		20,308	274	3.47	2.43	1.43	0.20	9.1	6.4	1.23	.264	4.79	88	3.28	103	8.60	-55.7
13	Whitey Ford W. Ford	2.75	438	498	236	106	.690	1,956	156	45	11	3170.1	2,766	967	1,107	228	1,086	28	35	44	13,036	75	5.55	3.08	1.80	0.65	15.0	8.3	1.22	.261	3.14	75	3.26	88	7.85	156.9
14	John Clarkson J. Clarkson	2.81	518	531	328	178	.648	1,978	485	37	5	4536.1	4,295	1,417	2,384	159	1,191	80	12		19,146	182	3.92	2.36	1.66	0.32	10.3	6.2	1.21	.263	4.73	75	3.35	88	8.52	289.8
15	George Mullin G. Mullin	2.82	428	487	228	196	.538	1,482	353	35	8	3686.2	3,518	1,156	1,636	42	1,238	130	51		15,179	85	3.62	3.02	1.20	0.10	9.8	8.2	1.29	.283	3.99	99	2.91	104	8.59	-39
16	Jim Palmer J. Palmer	2.86	521	558	268	152	.638	2,212	211	53	4	3948.0	3,349	1,253	1,395	303	1,311	38	15	37	16,114	85	5.04	2.99	1.69	0.69	13.7	8.1	1.18	.249	3.18	80	3.50	95	7.63	83.2
17	Tom Seaver T. Seaver	2.86	647	656	311	205	.603	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
18	Pud Galvin P. Galvin	2.87	681	697	361	308	.540	1,799	639	57	1	5941.1	6,352	1,895	3,315	121	744	54	18		25,160	220	2.73	1.13	2.42	0.18	7.2	3.0	1.19	.278	5.02	94	2.97	95	9.62	94.5
19	Juan Marichal J. Marichal	2.89	457	471	243	142	.631	2,303	244	52	2	3507.0	3,153	1,126	1,329	320	709	40	11	82	14,236	51	5.91	1.82	3.25	0.82	16.2	5.0	1.10	.261	3.41	81	3.04	88	8.09	154.8
20	Wilbur Cooper W. Cooper	2.89	406	517	216	178	.548	1,252	279	35	14	3480.0	3,415	1,119	1,406	103	853	100	83		14,377	44	3.24	2.21	1.47	0.27	8.7	5.9	1.23	.274	3.64	86	3.17	94	8.83	72.2
21	Bob Gibson B. Gibson	2.91	482	528	251	174	.591	3,117	255	56	6	3884.1	3,279	1,258	1,420	257	1,336	102	21	118	16,068	108	7.22	3.10	2.33	0.60	19.4	8.3	1.19	.268	3.29	78	2.89	81	7.60	290.5
22	Pedro Martinez P. Martinez	2.93	409	476	219	100	.687	3,154	46	17	3	2827.1	2,221	919	1,006	239	760	141	23	30	11,394	62	10.04	2.42	4.15	0.76	27.7	6.7	1.05	.279	3.20	66	2.91	68	7.07	454.6
23	Don Drysdale D. Drysdale	2.95	465	518	209	166	.557	2,486	167	49	6	3432.0	3,084	1,124	1,292	280	855	154	34	123	14,097	82	6.52	2.24	2.91	0.73	17.6	6.1	1.15	.272	3.39	83	3.02	88	8.09	162.2
24	Kid Nichols K. Nichols	2.96	562	621	361	208	.634	1,881	532	48	17	5067.1	4,929	1,664	2,480	156	1,272	129	56		21,082	169	3.34	2.26	1.48	0.28	8.9	6.0	1.22	.271	4.40	73	3.48	85	8.75	377.8
25	Jack Powell J. Powell	2.97	516	578	245	254	.491	1,621	422	46	15	4389.0	4,319	1,450	1,991	110	1,021	120	57		17,896	67	3.32	2.09	1.59	0.23	9.1	5.7	1.22	.280	4.08	95	3.01	97	8.86	35