Jacob deGrom has the best career ERA for the Mets, with an ERA of 2.52.

Interpreted as:

player with the best era with a minimum of 750 IP all-time mets

	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	Jacob deGrom J. deGrom	2.52	1326.0	209	82	57	.590	209	1,607	4	2	0	1,021	372	407	117	303	21	0	13	5,217	26	10.91	2.06	5.30	0.79	30.8	5.8	1.00	.285	2.76	65	2.61	64	6.93	216.2
2	Tom Seaver T. Seaver	2.57	3045.2	401	198	124	.615	395	2,541	171	44	1	2,431	870	953	212	847	52	5	70	12,191	81	7.51	2.50	3.00	0.63	20.8	6.9	1.08	.260	2.82	74	2.67	78	7.18	255.8
3	Jon Matlack J. Matlack	3.03	1448.0	203	82	81	.503	199	1,023	65	26	0	1,312	488	557	92	419	15	2	57	5,953	42	6.36	2.60	2.44	0.57	17.2	7.0	1.20	.277	3.46	87	2.88	82	8.15	100.6
4	Jerry Koosman J. Koosman	3.09	2544.2	376	140	137	.505	346	1,799	108	26	5	2,281	875	994	187	820	49	14	92	10,517	66	6.36	2.90	2.19	0.66	17.1	7.8	1.22	.273	3.52	89	3.12	90	8.07	93.1
5	Dwight Gooden D. Gooden	3.10	2169.2	305	157	85	.649	303	1,875	67	23	1	1,898	747	823	123	651	41	1	31	8,898	47	7.78	2.70	2.88	0.51	21.1	7.3	1.17	.286	3.41	86	2.76	75	7.87	217.6
6	Bob Ojeda B. Ojeda	3.12	764.0	140	51	40	.560	109	459	17	9	0	690	265	305	52	213	10	10	15	3,139	9	5.41	2.51	2.15	0.61	14.6	6.8	1.18	.265	3.59	90	3.33	93	8.13	21.5
7	David Cone D. Cone	3.13	1209.1	187	81	51	.614	169	1,172	34	15	1	1,011	421	472	91	431	28	4	23	5,008	62	8.72	3.21	2.72	0.68	23.4	8.6	1.19	.280	3.51	89	2.98	82	7.52	85.8
8	Sid Fernandez S. Fernandez	3.14	1584.2	255	98	78	.557	250	1,449	23	9	1	1,167	553	601	138	596	36	1	27	6,456	20	8.23	3.38	2.43	0.78	22.4	9.2	1.11	.243	3.41	88	3.29	90	6.63	60.3
9	Tug McGraw T. McGraw	3.17	792.2	361	47	55	.461	36	618	5	1	86	685	279	316	64	350	13	228	67	3,345	44	7.02	3.97	1.77	0.73	18.5	10.5	1.31	.270	3.59	89	3.38	98	7.78	5.5
10	Al Leiter A. Leiter	3.42	1360.0	213	95	67	.586	213	1,106	10	7	0	1,222	517	574	118	546	63	0	38	5,774	24	7.32	3.61	2.03	0.78	19.2	9.5	1.30	.280	3.80	82	3.91	91	8.09	60
11	Ron Darling R. Darling	3.50	1620.0	257	99	70	.586	241	1,148	25	10	0	1,473	630	716	155	614	36	4	23	6,807	63	6.38	3.41	1.87	0.86	16.9	9.0	1.29	.272	3.98	99	3.80	105	8.18	-35.5
12	Gary Gentry G. Gentry	3.56	789.1	131	41	42	.494	121	563	22	8	1	667	312	348	79	324	26	4	25	3,322	23	6.42	3.69	1.74	0.90	16.9	9.8	1.26	.252	3.97	100	3.70	108	7.61	-24.5
13	Rick Reed R. Reed	3.66	888.2	140	59	36	.621	138	590	8	3	0	868	361	380	116	158	18	0	14	3,605	6	5.98	1.60	3.73	1.17	16.4	4.4	1.15	.276	3.85	87	4.07	94	8.79	23.4
14	Craig Swan C. Swan	3.72	1230.2	229	59	71	.454	184	671	25	7	2	1,191	508	569	112	368	11	15	38	5,140	7	4.91	2.69	1.82	0.82	13.1	7.2	1.27	.271	4.16	104	3.70	102	8.71	-12.7
15	Tom Glavine T. Glavine	3.97	1005.1	164	61	56	.521	164	516	4	3	0	1,057	443	472	98	323	15	0	31	4,293	6	4.62	2.89	1.60	0.88	12.0	7.5	1.37	.287	4.23	94	4.34	100	9.46	-1.8
16	Jonathon Niese J. Niese	3.99	1079.1	188	61	62	.496	179	838	3	2	0	1,147	478	540	110	329	38	2	13	4,663	27	6.99	2.74	2.55	0.92	18.0	7.1	1.37	.310	4.50	107	3.88	101	9.56	-5.1
17	Steve Trachsel S. Trachsel	4.09	956.1	160	66	59	.528	160	580	5	4	0	967	435	478	124	354	16	0	30	4,098	22	5.46	3.33	1.64	1.17	14.2	8.6	1.38	.279	4.50	98	4.67	109	9.10	-44.4
18	Jack Fisher J. Fisher	4.12	931.2	160	38	73	.342	133	475	35	4	1	988	427	474	92	242	26	14	18	3,957	28	4.59	2.34	1.96	0.89	12.0	6.1	1.32	.287	4.58	119	3.68	110	9.54	-34.2
19	Bobby Jones B. Jones	4.13	1215.2	193	74	56	.569	190	714	10	4	0	1,255	558	628	137	353	33	0	32	5,154	13	5.29	2.61	2.02	1.01	13.9	6.8	1.32	.285	4.65	100	4.36	103	9.29	-16.8
20	Al Jackson A. Jackson	4.26	980.2	184	43	80	.350	138	561	41	10	6	1,033	464	541	82	304	32	15	20	4,231	28	5.15	2.79	1.85	0.75	13.3	7.2	1.36	.292	4.96	120	3.51	101	9.48	-3.1
21	Mike Pelfrey M. Pelfrey	4.36	896.1	153	50	54	.481	149	506	4	0	1	989	434	463	70	318	45	1	22	3,931	12	5.08	3.19	1.59	0.70	12.9	8.1	1.46	.307	4.65	109	4.19	103	9.93	-13.5