Aroldis Chapman had the lowest ERA with 40.0+ innings pitched this season, with an ERA of 1.17.

Interpreted as:

lowest era among players with 40+ ip this regular season

	NAME	ERA	IP	SEASON	TM	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	1.17	61.1	2025	BOS	67	5	3	.625	0	85	0	0	32	28	8	9	3	15	0	43	0	228	6	12.47	2.20	5.67	0.44	37.3	6.6	0.70	.200	1.32	27	1.73	41	4.11	16.8
2	Cole Winn C. Winn	1.51	41.2	2025	TEX	33	0	1	.000	0	35	0	0	0	23	7	8	3	17	4	10	2	162	1	7.56	3.67	2.06	0.65	21.6	10.5	0.96	.194	1.73	37	3.90	92	4.97	1.7
3	Edwin Díaz E. Díaz	1.63	66.1	2025	NYM	62	6	3	.667	0	98	0	0	28	37	12	14	4	21	8	48	0	258	7	13.30	2.85	4.67	0.54	38.0	8.1	0.87	.260	1.90	40	2.27	55	5.02	13.5
4	Abner Uribe A. Uribe	1.67	75.1	2025	MIL	75	3	2	.600	0	90	0	0	7	51	14	18	4	27	6	15	2	298	5	10.75	3.23	3.33	0.48	30.2	9.1	1.04	.275	2.15	40	2.74	66	6.09	11.9
5	Nathan Eovaldi N. Eovaldi	1.73	130.0	2025	TEX	22	11	3	.786	22	129	1	1	0	90	25	28	10	21	7	0	1	496	6	8.93	1.45	6.14	0.69	26.0	4.2	0.85	.243	1.94	42	2.79	66	6.23	20.8
6	Andrés Muñoz A. Muñoz	1.73	62.1	2025	SEA	64	3	3	.500	0	83	0	0	38	36	12	18	2	28	4	47	3	254	7	11.98	4.04	2.96	0.29	32.7	11.0	1.03	.248	2.60	45	2.42	60	5.20	11.3
7	Randy Rodríguez R. Rodríguez	1.78	50.2	2025	SFG	50	3	5	.375	0	67	0	0	4	34	10	12	4	11	4	15	0	198	2	11.90	1.95	6.09	0.71	33.8	5.6	0.89	.268	2.13	43	2.40	60	6.04	9.1
8	Trevor Rogers T. Rogers	1.81	109.2	2025	BAL	18	9	3	.750	18	103	1	0	0	70	22	23	6	29	2	0	0	423	0	8.45	2.38	3.55	0.49	24.3	6.9	0.90	.226	1.89	45	2.81	69	5.74	15.8
9	Jason Adam J. Adam	1.93	65.1	2025	SDP	65	8	4	.667	0	70	0	0	0	50	14	18	4	25	3	4	3	270	3	9.64	3.44	2.80	0.55	25.9	9.3	1.15	.274	2.48	48	3.07	75	6.89	7.5
10	Matt Svanson M. Svanson	1.94	60.1	2025	STL	39	4	0	1.000	0	68	0	0	0	33	13	14	3	20	4	10	0	234	1	10.14	2.98	3.40	0.45	29.1	8.5	0.88	.216	2.09	47	2.71	67	4.92	9.1
11	Paul Skenes P. Skenes	1.97	187.2	2025	PIT	32	10	10	.500	32	216	1	0	0	136	41	45	11	42	6	0	0	733	2	10.36	2.01	5.14	0.53	29.5	5.7	0.95	.273	2.16	46	2.36	57	6.52	37
12	Tyler Rogers T. Rogers	1.98	77.1	2025	TOT	81	4	6	.400	0	48	0	0	0	66	17	20	4	7	1	13	0	299	0	5.59	0.81	6.86	0.47	16.1	2.3	0.94	.259	2.33	49	2.87	71	7.68	10
13	Josh Hader J. Hader	2.05	52.2	2025	HOU	48	6	2	.750	0	76	0	0	28	29	12	16	8	16	2	41	1	206	2	12.99	2.73	4.75	1.37	36.9	7.8	0.85	.202	2.73	51	3.24	79	4.96	5.2
14	Jhoan Duran J. Duran	2.06	70.0	2025	TOT	72	7	6	.538	0	80	0	0	32	58	16	19	3	19	3	55	4	287	3	10.29	2.44	4.21	0.39	27.9	6.6	1.10	.302	2.44	50	2.34	56	7.46	14.2
15	Riley O'Brien R. O'Brien	2.06	48.0	2025	STL	42	3	1	.750	0	45	0	0	6	33	11	13	2	22	7	15	2	199	3	8.44	4.13	2.05	0.38	22.6	11.1	1.15	.252	2.44	50	3.61	89	6.19	2.4
16	Nolan McLean N. McLean	2.06	48.0	2025	NYM	8	5	1	.833	8	57	0	0	0	34	11	13	4	16	2	0	0	188	2	10.69	3.00	3.56	0.75	30.3	8.5	1.04	.275	2.44	51	2.96	72	6.38	6.1
17	JoJo Romero J. Romero	2.07	61.0	2025	STL	65	4	6	.400	0	55	0	0	8	47	14	21	2	29	2	16	5	255	2	8.11	4.28	1.90	0.30	21.6	11.4	1.25	.269	3.10	50	3.28	81	6.93	5.3
18	Brad Keller B. Keller	2.07	69.2	2025	CHC	68	4	2	.667	1	75	0	0	3	45	16	18	4	22	6	12	0	276	1	9.69	2.84	3.41	0.52	27.2	8.0	0.96	.243	2.33	51	2.93	72	5.81	8.8
19	Adrian Morejon A. Morejon	2.08	73.2	2025	SDP	75	13	6	.684	0	70	0	0	3	49	17	23	2	17	0	9	3	286	2	8.55	2.08	4.12	0.24	24.5	5.9	0.90	.239	2.81	51	2.27	56	5.99	15
20	Anthony Bender A. Bender	2.16	50.0	2025	MIA	51	3	5	.375	0	42	0	0	4	32	12	13	3	21	2	12	2	204	1	7.56	3.78	2.00	0.54	20.6	10.3	1.06	.213	2.34	50	3.61	87	5.76	2.9
21	Aaron Ashby A. Ashby	2.16	66.2	2025	MIL	43	5	2	.714	1	76	0	0	3	54	16	16	3	24	4	9	0	270	6	10.26	3.24	3.17	0.41	28.1	8.9	1.17	.313	2.16	51	2.69	65	7.29	10.9
22	Drew Pomeranz D. Pomeranz	2.17	49.2	2025	CHC	57	2	2	.500	4	57	0	0	1	38	12	14	5	15	5	11	1	203	1	10.33	2.72	3.80	0.91	28.1	7.4	1.07	.273	2.54	53	3.35	83	6.89	3.9
23	Dennis Santana D. Santana	2.18	70.1	2025	PIT	70	4	5	.444	0	60	0	0	16	44	17	18	5	17	3	34	0	270	0	7.68	2.18	3.53	0.64	22.2	6.3	0.87	.211	2.30	51	3.20	77	5.63	7.3
24	Tyler Mahle T. Mahle	2.18	86.2	2025	TEX	16	6	4	.600	16	66	0	0	0	69	21	21	5	29	0	0	0	346	0	6.85	3.01	2.28	0.52	19.1	8.4	1.13	.260	2.18	53	3.36	79	7.17	8.5
25	Tarik Skubal T. Skubal	2.21	195.1	2025	DET	31	13	6	.684	31	241	1	1	0	141	48	55	18	33	5	0	0	748	3	11.10	1.52	7.30	0.83	32.2	4.4	0.89	.273	2.53	55	2.44	59	6.50	36.9