Jason Adam has the best ERA by an active pitcher this season, with an ERA of 1.29.

Interpreted as:

lowest era with a minimum of 0.5 IP per team game by an active pitcher this regular season

	NAME	ERA	SEASON	TM	G	W	L	W%	GS	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	Jason Adam J. Adam	1.29	2025	SDP	28	5	1	.833	0	31	0	0	0	28.0	15	4	7	2	14	2	3	0	115	2	9.96	4.50	2.21	0.64	27.0	12.2	1.04	.197	2.25	33	3.50	89	4.82	1.3
2	Huascar Brazobán H. Brazobán	1.34	2025	NYM	25	3	1	.750	2	32	0	0	1	33.2	19	5	7	3	9	3	4	0	127	0	8.55	2.41	3.56	0.80	25.2	7.1	0.83	.200	1.87	34	3.40	87	5.08	2
3	Kris Bubic K. Bubic	1.45	2025	KCR	11	5	2	.714	11	70	0	0	0	68.1	49	11	13	3	20	2	0	1	268	0	9.22	2.63	3.50	0.40	26.1	7.5	1.01	.266	1.71	35	2.56	63	6.45	11.4
4	Kodai Senga K. Senga	1.46	2025	NYM	10	5	3	.625	10	52	0	0	0	55.2	43	9	12	2	26	1	0	0	228	4	8.41	4.20	2.00	0.32	22.8	11.4	1.24	.279	1.94	37	3.13	80	6.95	5
5	Andrew Abbott A. Abbott	1.51	2025	CIN	9	5	0	1.000	9	53	0	0	0	47.2	31	8	9	4	18	1	0	0	188	3	10.01	3.40	2.94	0.76	28.2	9.6	1.03	.241	1.70	35	3.13	75	5.85	5.5
6	Nathan Eovaldi N. Eovaldi	1.56	2025	TEX	12	4	3	.571	12	73	1	1	0	69.1	46	12	14	4	10	4	0	0	266	4	9.48	1.30	7.30	0.52	27.4	3.8	0.81	.240	1.82	39	2.32	56	5.97	13.8
7	Tyler Mahle T. Mahle	1.64	2025	TEX	12	5	2	.714	12	48	0	0	0	66.0	45	12	12	2	24	0	0	0	259	0	6.55	3.27	2.00	0.27	18.5	9.3	1.05	.232	1.64	41	3.10	75	6.14	7.5
8	Jake Bird J. Bird	1.67	2025	COL	23	1	1	.500	0	39	0	0	0	32.1	24	6	7	1	15	1	3	1	133	2	10.86	4.18	2.60	0.28	29.3	11.3	1.21	.299	1.95	36	2.55	61	6.68	5.6
9	Brant Hurter B. Hurter	1.84	2025	DET	16	2	0	1.000	1	27	0	0	2	29.1	19	6	6	3	8	3	3	2	113	0	8.28	2.45	3.38	0.92	23.9	7.1	0.92	.222	1.84	47	3.69	92	5.83	1.1
10	Steven Matz S. Matz	1.91	2025	STL	15	3	1	.750	2	27	0	0	1	33.0	28	7	8	0	3	1	1	0	130	1	7.36	0.82	9.00	0.00	20.8	2.3	0.94	.283	2.18	48	1.80	46	7.64	7.8
11	Max Fried M. Fried	1.92	2025	NYY	12	7	1	.875	12	70	0	0	0	75.0	57	16	21	5	16	4	0	0	299	4	8.40	1.92	4.38	0.60	23.4	5.4	0.97	.255	2.52	49	2.87	69	6.84	10.7
12	Yoshinobu Yamamoto Y. Yamamoto	1.97	2025	LAD	11	6	3	.667	11	75	0	0	0	64.0	38	14	17	5	20	1	0	0	246	3	10.55	2.81	3.75	0.70	30.5	8.1	0.91	.228	2.39	49	2.73	67	5.34	9.2
13	Hunter Brown H. Brown	2.00	2025	HOU	11	7	3	.700	11	79	1	0	0	67.2	46	15	16	6	16	0	0	0	253	0	10.51	2.13	4.94	0.80	31.2	6.3	0.92	.263	2.13	51	2.60	65	6.12	10.8
14	Garrett Crochet G. Crochet	2.04	2025	BOS	12	4	4	.500	12	89	0	0	0	75.0	56	17	20	6	24	0	0	0	299	0	10.68	2.88	3.71	0.72	29.8	8.0	1.07	.278	2.40	49	2.70	66	6.72	11.6
15	Kyle Leahy K. Leahy	2.08	2025	STL	24	1	1	.500	0	23	0	0	0	30.1	18	7	7	2	9	1	2	0	116	0	6.82	2.67	2.56	0.59	19.8	7.8	0.89	.198	2.08	52	3.40	87	5.34	1.6
16	Mike Vasil M. Vasil	2.10	2025	CWS	17	3	2	.600	0	24	0	0	1	34.1	23	8	9	2	21	3	7	3	147	0	6.29	5.50	1.14	0.52	16.3	14.3	1.28	.216	2.36	53	4.53	108	6.03	-1.2
17	Jesús Luzardo J. Luzardo	2.15	2025	PHI	11	5	0	1.000	11	77	0	0	0	67.0	60	16	19	3	19	1	0	0	273	1	10.34	2.55	4.05	0.40	28.2	7.0	1.18	.329	2.55	53	2.25	56	8.06	13.2
18	Paul Skenes P. Skenes	2.15	2025	PIT	12	4	5	.444	12	77	1	0	0	75.1	51	18	20	4	18	2	0	0	293	1	9.20	2.15	4.28	0.48	26.3	6.1	0.92	.245	2.39	52	2.51	63	6.09	12.2
19	Drew Rasmussen D. Rasmussen	2.33	2025	TBR	11	4	4	.500	11	48	0	0	0	58.0	41	15	15	6	13	3	0	0	222	0	7.45	2.02	3.69	0.93	21.6	5.9	0.93	.230	2.33	61	3.59	91	6.36	2.2
20	Logan Gilbert L. Gilbert	2.37	2025	SEA	6	1	1	.500	6	44	0	0	0	30.1	18	8	8	3	6	1	0	0	117	2	13.05	1.78	7.33	0.89	37.6	5.1	0.79	.238	2.37	64	2.15	55	5.34	6.1
21	Jacob deGrom J. deGrom	2.42	2025	TEX	11	4	2	.667	11	62	0	0	0	63.1	47	17	17	9	14	1	0	0	247	1	8.81	1.99	4.43	1.28	25.1	5.7	0.96	.236	2.42	61	3.67	89	6.68	3.3
22	Hayden Birdsong H. Birdsong	2.48	2025	SFG	13	2	1	.667	2	35	0	0	0	32.2	30	9	14	4	12	2	2	0	140	3	9.64	3.31	2.92	1.10	25.0	8.6	1.29	.299	3.86	63	3.81	100	8.27	0
23	Tarik Skubal T. Skubal	2.49	2025	DET	11	5	2	.714	11	92	1	1	0	68.2	51	19	19	6	7	3	0	0	263	1	12.06	0.92	13.14	0.79	35.0	2.7	0.84	.290	2.49	64	1.96	49	6.68	15.8
24	Robbie Ray R. Ray	2.56	2025	SFG	11	7	0	1.000	11	69	0	0	0	63.1	46	18	18	5	27	0	0	0	256	2	9.81	3.84	2.56	0.71	27.0	10.5	1.15	.265	2.56	65	3.20	84	6.54	4.4
25	Joe Ryan J. Ryan	2.57	2025	MIN	11	5	2	.714	10	72	0	0	0	63.0	43	18	18	8	9	7	0	0	242	0	10.29	1.29	8.00	1.14	29.8	3.7	0.83	.240	2.57	65	3.20	79	6.14	6