Jake Irvin had the highest ERA- this season, with an ERA- of 137.

Interpreted as:

worst era- with a minimum of 1 IP per team game by a player in MLB this 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	Jake Irvin J. Irvin	137	2025	WSH	33	9	13	.409	33	5.70	124	0	0	0	180.0	195	114	120	38	62	6	0	0	787	3	6.20	3.10	2.00	1.90	15.8	7.9	1.43	.282	6.00	5.63	135	9.75	-28.7
2	Mitchell Parker M. Parker	136	2025	WSH	33	9	16	.360	30	5.68	103	0	0	1	164.2	178	104	116	25	58	4	2	0	725	3	5.63	3.17	1.78	1.37	14.2	8.0	1.43	.286	6.34	4.98	119	9.73	-14.6
3	Andre Pallante A. Pallante	129	2025	STL	31	6	15	.286	31	5.31	111	0	0	0	162.2	173	96	109	21	62	5	0	0	715	12	6.14	3.43	1.79	1.16	15.5	8.7	1.44	.295	6.03	4.68	116	9.57	-11.7
4	Sandy Alcantara S. Alcantara	125	2025	MIA	31	11	12	.478	31	5.36	142	0	0	0	174.2	165	104	107	22	57	9	0	0	745	8	7.32	2.94	2.49	1.13	19.1	7.7	1.27	.278	5.51	4.27	103	8.50	-2.7
5	Shane Baz S. Baz	124	2025	TBR	31	10	12	.455	31	4.87	176	0	0	0	166.1	158	90	91	26	64	9	0	0	711	3	9.52	3.46	2.75	1.41	24.8	9.0	1.33	.303	4.92	4.36	108	8.55	-6.2
6	Brandon Pfaadt B. Pfaadt	123	2025	AZ	33	13	9	.591	33	5.25	147	0	0	0	176.2	198	103	107	26	37	12	0	2	767	3	7.49	1.88	3.97	1.32	19.2	4.8	1.33	.316	5.45	4.21	105	10.09	-4.3
7	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
8	Zac Gallen Z. Gallen	113	2025	AZ	33	13	15	.464	33	4.83	175	0	0	0	192.0	176	103	109	31	66	4	0	1	813	2	8.20	3.09	2.65	1.45	21.5	8.1	1.26	.270	5.11	4.50	112	8.25	-11
9	Dylan Cease D. Cease	113	2025	SDP	32	8	12	.400	32	4.55	215	0	0	0	168.0	152	85	91	21	71	5	0	2	722	5	11.52	3.80	3.03	1.13	29.8	9.8	1.33	.320	4.88	3.55	87	8.14	10.1
10	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
11	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
12	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
13	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
14	Kyle Freeland K. Freeland	105	2025	COL	31	5	17	.227	31	4.98	124	0	0	0	162.2	193	90	105	22	38	6	0	2	709	2	6.86	2.10	3.26	1.22	17.5	5.4	1.42	.329	5.81	4.17	96	10.68	3.2
15	David Peterson D. Peterson	104	2025	NYM	30	9	6	.600	30	4.22	150	1	1	0	168.2	166	79	84	11	65	7	0	1	723	3	8.00	3.47	2.31	0.59	20.7	9.0	1.37	.316	4.48	3.48	85	8.86	11.5
16	Sonny Gray S. Gray	104	2025	STL	32	14	8	.636	32	4.28	201	1	1	0	180.2	185	86	93	25	38	3	0	0	753	2	10.01	1.89	5.29	1.25	26.7	5.0	1.23	.329	4.63	3.38	84	9.22	13.5
17	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
18	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
19	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
20	Nick Martinez N. Martinez	100	2025	CIN	40	11	14	.440	26	4.45	116	0	0	0	165.2	158	82	86	22	42	6	2	1	683	6	6.30	2.28	2.76	1.20	17.0	6.1	1.21	.274	4.67	4.32	99	8.58	1.4
21	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
22	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
23	Mitch Keller M. Keller	97	2025	PIT	32	6	15	.286	32	4.19	150	0	0	0	176.1	171	82	91	21	51	10	0	0	749	5	7.66	2.60	2.94	1.07	20.0	6.8	1.26	.290	4.64	4.01	97	8.73	2.3
24	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
25	Zack Littell Z. Littell	93	2025	TOT	32	10	8	.556	32	3.81	130	1	0	0	186.2	174	79	81	36	32	7	0	1	759	3	6.27	1.54	4.06	1.74	17.1	4.2	1.10	.249	3.91	4.87	118	8.39	-15.4