Aroldis Chapman has the best career ERA by an active pitcher, with an ERA of 2.52.

Interpreted as:

active pitchers with lowest era with a minimum of 750 IP

	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	Aroldis Chapman A. Chapman	2.52	821.1	863	60	47	.561	0	1,331	0	0	367	475	230	255	54	408	33	563	7	3,341	87	14.58	4.47	3.26	0.59	39.8	12.2	1.08	.278	2.79	61	2.36	57	5.20	161.8
2	Kenley Jansen K. Jansen	2.57	927.1	934	54	40	.574	0	1,278	0	0	475	610	265	284	88	282	32	700	20	3,680	21	12.40	2.74	4.53	0.85	34.7	7.7	0.96	.261	2.76	65	2.62	64	5.92	147.2
3	Jacob deGrom J. deGrom	2.57	1539.2	248	96	65	.596	248	1,851	4	2	0	1,173	440	477	146	345	25	0	13	6,045	30	10.82	2.02	5.37	0.85	30.6	5.7	0.99	.279	2.79	66	2.70	66	6.86	239.4
4	Chris Sale C. Sale	3.01	2084.0	393	145	88	.622	312	2,579	16	3	12	1,692	697	750	213	487	130	25	15	8,389	48	11.14	2.10	5.30	0.92	30.7	5.8	1.05	.297	3.24	70	2.87	68	7.31	303.3
5	Max Fried M. Fried	3.03	1079.2	200	92	41	.692	183	1,052	6	4	0	947	364	405	90	297	45	10	6	4,415	47	8.77	2.48	3.54	0.75	23.8	6.7	1.15	.292	3.38	71	3.24	78	7.89	112
6	Tarik Skubal T. Skubal	3.08	766.2	137	54	37	.593	134	889	1	1	0	614	262	287	90	172	26	1	0	3,056	11	10.44	2.02	5.17	1.06	29.1	5.6	1.03	.279	3.37	75	3.14	76	7.21	84
7	Blake Snell B. Snell	3.15	1158.0	222	81	62	.566	222	1,440	1	1	0	891	405	440	111	521	11	0	6	4,791	86	11.19	4.05	2.76	0.86	30.1	10.9	1.22	.288	3.42	77	3.31	79	6.92	111.7
8	Corbin Burnes C. Burnes	3.15	968.0	210	63	38	.624	149	1,114	0	0	2	756	339	374	104	280	38	16	3	3,914	42	10.36	2.60	3.98	0.97	28.5	7.2	1.07	.274	3.48	75	3.25	78	7.03	100.7
9	Gerrit Cole G. Cole	3.18	1954.0	317	153	80	.657	317	2,251	8	5	0	1,627	690	740	217	500	61	0	8	7,861	58	10.37	2.30	4.50	1.00	28.6	6.4	1.09	.292	3.41	79	3.16	77	7.49	213.5
10	Shane Bieber S. Bieber	3.24	883.1	143	66	34	.660	141	995	5	2	0	786	318	339	102	195	19	1	1	3,574	34	10.14	1.99	5.10	1.04	27.8	5.5	1.11	.302	3.45	76	3.15	75	8.01	106.7
11	Zack Wheeler Z. Wheeler	3.28	1728.1	283	113	75	.601	283	1,820	5	3	0	1,475	630	683	166	490	76	0	14	7,086	41	9.48	2.55	3.71	0.86	25.7	6.9	1.14	.289	3.56	82	3.28	80	7.68	164.6
12	Logan Webb L. Webb	3.38	1062.1	180	69	51	.575	177	994	3	2	0	1,020	399	440	74	250	36	0	4	4,350	22	8.42	2.12	3.98	0.63	22.9	5.7	1.20	.316	3.73	83	3.01	75	8.64	121.8
13	Seth Lugo S. Lugo	3.49	993.0	360	64	47	.577	123	954	1	0	16	889	385	413	122	276	37	66	18	4,098	22	8.65	2.50	3.46	1.11	23.3	6.7	1.17	.283	3.74	85	3.79	91	8.06	41
14	Luis Castillo L. Castillo	3.55	1410.2	243	83	84	.497	243	1,493	1	0	0	1,208	557	608	174	453	48	0	8	5,824	19	9.53	2.89	3.30	1.11	25.6	7.8	1.18	.283	3.88	86	3.72	88	7.71	78.1
15	Logan Gilbert L. Gilbert	3.58	835.1	146	46	36	.561	146	884	2	1	0	703	332	352	111	181	25	0	6	3,377	41	9.52	1.95	4.88	1.20	26.2	5.4	1.06	.272	3.79	92	3.51	88	7.57	44.3
16	Sonny Gray S. Gray	3.58	1918.0	339	125	102	.551	330	1,925	7	5	0	1,675	763	836	192	621	57	2	5	7,952	106	9.03	2.91	3.10	0.90	24.2	7.8	1.20	.288	3.92	87	3.51	85	7.86	136.2
17	Freddy Peralta F. Peralta	3.59	931.0	211	70	42	.625	162	1,153	1	0	1	694	371	392	118	360	48	6	3	3,853	31	11.15	3.48	3.20	1.14	29.9	9.3	1.13	.265	3.79	85	3.66	87	6.71	59.2
18	Sandy Alcantara S. Alcantara	3.65	1075.1	177	52	67	.437	169	931	12	4	0	934	436	485	113	330	44	3	8	4,425	26	7.79	2.76	2.82	0.95	21.0	7.5	1.18	.273	4.06	86	3.85	92	7.82	37.7
19	Yu Darvish Y. Darvish	3.65	1778.0	297	115	93	.553	297	2,075	2	1	0	1,460	721	756	231	563	83	0	8	7,305	83	10.50	2.85	3.69	1.17	28.4	7.7	1.14	.282	3.83	87	3.58	85	7.39	120
20	Lance McCullers Jr. L. McCullers Jr.	3.70	774.0	146	51	37	.580	140	861	1	0	0	664	318	344	67	335	45	2	4	3,291	48	10.01	3.90	2.57	0.78	26.2	10.2	1.29	.301	4.00	90	3.52	84	7.72	56.8
21	Joe Musgrove J. Musgrove	3.73	1056.0	206	66	62	.516	180	1,050	2	2	2	970	438	472	133	262	77	7	10	4,385	21	8.95	2.23	4.01	1.13	23.9	6.0	1.17	.292	4.02	91	3.78	90	8.27	49.3
22	Carlos Rodón C. Rodón	3.73	1282.0	231	93	72	.564	226	1,409	3	1	0	1,085	532	574	159	477	65	1	5	5,378	65	9.89	3.35	2.95	1.12	26.2	8.9	1.22	.283	4.03	90	3.83	90	7.62	58.2
23	Tyler Glasnow T. Glasnow	3.74	754.0	167	43	36	.544	128	952	0	0	0	575	313	333	94	290	13	9	5	3,085	63	11.36	3.46	3.28	1.12	30.9	9.4	1.15	.277	3.97	91	3.47	83	6.86	59.4
24	Merrill Kelly M. Kelly	3.77	1008.1	172	65	53	.551	172	911	0	0	0	907	422	448	130	300	17	0	10	4,143	15	8.13	2.68	3.04	1.16	22.0	7.2	1.20	.279	4.00	89	3.98	97	8.10	14.6
25	Jack Flaherty J. Flaherty	3.80	990.2	190	63	56	.529	184	1,130	0	0	0	836	418	440	135	351	54	0	10	4,120	35	10.27	3.19	3.22	1.23	27.4	8.5	1.20	.286	4.00	93	3.89	94	7.59	28.8