Tarik Skubal had the best ERA- in the AL this season, with an ERA- of 55.

Interpreted as:

american league era- with a minimum of 1 IP per team game leaders this regular season

	NAME	ERA-	SEASON	TM	G	W	L	W%	GS	ERA	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	FIP	FIP-	H/9	PRAA
1	Tarik Skubal T. Skubal	55	2025	DET	31	13	6	.684	31	2.21	241	1	1	0	195.1	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	2.44	59	6.50	36.9
2	Garrett Crochet G. Crochet	60	2025	BOS	32	18	5	.783	32	2.59	255	1	1	0	205.1	165	59	62	24	46	3	0	0	814	7	11.18	2.02	5.54	1.05	31.3	5.7	1.03	.290	2.72	2.88	68	7.23	30.2
3	Hunter Brown H. Brown	60	2025	HOU	31	12	9	.571	31	2.43	206	1	0	0	185.1	133	50	55	17	57	7	0	1	729	0	10.00	2.77	3.61	0.83	28.3	7.8	1.03	.262	2.67	3.13	76	6.46	20.6
4	Max Fried M. Fried	70	2025	NYY	32	19	5	.792	32	2.86	189	0	0	0	195.1	164	62	73	14	51	10	0	0	801	8	8.71	2.35	3.71	0.65	23.6	6.4	1.10	.279	3.36	3.06	71	7.56	26.2
5	Jacob deGrom J. deGrom	73	2025	TEX	30	12	8	.600	30	2.97	185	0	0	0	172.2	122	57	57	26	37	3	0	0	669	3	9.64	1.93	5.00	1.36	27.7	5.5	0.92	.230	2.97	3.64	86	6.36	11.7
6	Carlos Rodón C. Rodón	76	2025	NYY	33	18	9	.667	33	3.09	203	0	0	0	195.1	132	67	74	22	73	9	0	0	789	4	9.35	3.36	2.78	1.01	25.7	9.3	1.05	.228	3.41	3.77	88	6.08	11.3
7	Gavin Williams G. Williams	76	2025	CLE	31	12	5	.706	31	3.06	173	0	0	0	167.2	130	57	62	23	83	3	0	0	704	9	9.29	4.46	2.08	1.23	24.6	11.8	1.27	.254	3.33	4.39	106	6.98	-4.9
8	Bryan Woo B. Woo	77	2025	SEA	30	15	7	.682	30	2.94	198	0	0	0	186.2	137	61	64	26	36	4	0	0	731	3	9.55	1.74	5.50	1.25	27.1	4.9	0.93	.238	3.09	3.46	86	6.61	11.4
9	Brayan Bello B. Bello	77	2025	BOS	29	11	9	.550	28	3.35	124	1	0	0	166.2	147	62	71	16	59	13	0	0	700	5	6.70	3.19	2.10	0.86	17.7	8.4	1.24	.268	3.83	4.18	99	7.94	0.6
10	Joe Ryan J. Ryan	84	2025	MIN	31	13	10	.565	30	3.42	194	0	0	0	171.0	138	65	69	26	39	12	0	0	689	0	10.21	2.05	4.97	1.37	28.2	5.7	1.04	.268	3.63	3.73	89	7.26	8.4
11	Kevin Gausman K. Gausman	89	2025	TOR	32	10	11	.476	32	3.59	189	1	1	0	193.0	155	77	79	21	50	3	0	2	775	1	8.81	2.33	3.78	0.98	24.4	6.5	1.06	.262	3.68	3.41	82	7.23	16.4
12	Michael Wacha M. Wacha	90	2025	KCR	31	10	13	.435	31	3.86	126	0	0	0	172.2	166	74	74	15	45	4	0	0	716	2	6.57	2.35	2.80	0.78	17.6	6.3	1.22	.287	3.86	3.65	87	8.65	10
13	Framber Valdez F. Valdez	90	2025	HOU	31	13	11	.542	31	3.66	187	2	0	0	192.0	171	78	82	15	68	7	0	0	802	12	8.77	3.19	2.75	0.70	23.3	8.5	1.24	.297	3.84	3.37	82	8.02	16.3
14	Luis Castillo L. Castillo	92	2025	SEA	32	11	8	.579	32	3.54	162	0	0	0	180.2	168	71	76	23	46	7	0	0	745	3	8.07	2.29	3.52	1.15	21.7	6.2	1.18	.286	3.79	3.87	97	8.37	2.5
15	Yusei Kikuchi Y. Kikuchi	96	2025	LAA	33	7	11	.389	33	3.99	174	0	0	0	178.1	180	79	87	24	74	3	0	3	772	8	8.78	3.73	2.35	1.21	22.5	9.6	1.42	.314	4.39	4.22	98	9.08	1.6
16	Chris Bassitt C. Bassitt	98	2025	TOR	32	11	9	.550	31	3.96	166	1	0	0	170.1	174	75	80	22	52	13	0	0	736	4	8.77	2.75	3.19	1.16	22.6	7.1	1.33	.315	4.23	4.00	96	9.19	3.2
17	Ryan Pepiot R. Pepiot	98	2025	TBR	31	11	12	.478	31	3.86	167	0	0	0	167.2	134	72	77	26	61	6	0	0	679	5	8.96	3.27	2.74	1.40	24.6	9.0	1.16	.258	4.13	4.35	108	7.19	-6.1
18	Jeffrey Springs J. Springs	100	2025	ATH	32	11	11	.500	30	4.11	138	0	0	0	171.0	153	78	90	28	54	3	0	0	713	0	7.26	2.84	2.56	1.47	19.4	7.6	1.21	.255	4.74	4.64	111	8.05	-9
19	José Soriano J. Soriano	102	2025	LAA	31	10	11	.476	31	4.26	152	0	0	0	169.0	158	80	89	12	78	5	0	0	724	8	8.09	4.15	1.95	0.64	21.0	10.8	1.40	.306	4.74	3.73	87	8.41	10.6
20	José Berríos J. Berríos	103	2025	TOR	31	9	5	.643	30	4.17	138	0	0	0	166.0	160	77	86	26	56	7	0	2	698	1	7.48	3.04	2.46	1.41	19.8	8.0	1.30	.285	4.66	4.64	111	8.67	-8.6
21	Dean Kremer D. Kremer	105	2025	BAL	31	11	10	.524	29	4.19	142	0	0	0	171.2	163	80	83	22	45	2	0	0	708	9	7.44	2.36	3.16	1.15	20.1	6.4	1.21	.284	4.35	3.96	97	8.55	2.3
22	Tanner Bibee T. Bibee	105	2025	CLE	31	12	11	.522	31	4.24	162	2	1	0	182.1	170	86	93	27	54	10	0	1	762	3	8.00	2.67	3.00	1.33	21.3	7.1	1.23	.281	4.59	4.33	105	8.39	-4.2
23	Will Warren W. Warren	109	2025	NYY	33	9	8	.529	33	4.44	171	0	0	0	162.1	158	80	90	22	65	4	0	0	711	2	9.48	3.60	2.63	1.22	24.1	9.1	1.37	.303	4.99	4.06	94	8.76	4.4
24	Luis Severino L. Severino	111	2025	ATH	29	8	11	.421	29	4.54	124	0	0	0	162.2	162	82	93	16	50	16	0	1	705	3	6.86	2.77	2.48	0.89	17.6	7.1	1.30	.293	5.15	4.10	98	8.96	1.3
25	Kyle Hendricks K. Hendricks	114	2025	LAA	31	8	10	.444	31	4.76	114	0	0	0	164.2	167	87	92	25	43	5	0	3	695	0	6.23	2.35	2.65	1.37	16.4	6.2	1.28	.280	5.03	4.59	107	9.13	-5.1