Tanner Houck has the worst ERA- this season, with an ERA- of 154.

Interpreted as:

highest era- with a minimum of 1 IP per team game by a player in MLB 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	Tanner Houck T. Houck	154	2025	BOS	7	0	2	.000	7	6.38	30	0	0	0	36.2	42	26	27	7	12	3	0	0	159	1	7.36	2.95	2.50	1.72	18.9	7.5	1.47	.327	6.63	5.13	125	10.31	-4.2
2	Dean Kremer D. Kremer	150	2025	BAL	7	3	4	.429	7	5.73	22	0	0	0	37.2	43	24	26	7	9	1	0	0	165	4	5.26	2.15	2.44	1.67	13.3	5.5	1.38	.286	6.21	5.10	129	10.27	-4.9
3	Eduardo Rodriguez E. Rodriguez	146	2025	AZ	6	1	3	.250	6	6.06	35	0	0	0	32.2	39	22	25	6	8	0	0	0	145	2	9.64	2.20	4.38	1.65	24.1	5.5	1.44	.344	6.89	4.03	104	10.74	-0.7
4	Dylan Cease D. Cease	142	2025	SDP	7	1	2	.333	7	5.61	39	0	0	0	33.2	39	21	23	3	15	1	0	1	154	0	10.43	4.01	2.60	0.80	25.3	9.7	1.60	.375	6.15	3.32	84	10.43	2.3
5	Zack Littell Z. Littell	134	2025	TBR	6	1	5	.167	6	5.03	22	0	0	0	34.0	34	19	19	8	8	0	0	1	139	0	5.82	2.12	2.75	2.12	15.8	5.8	1.24	.257	5.03	5.52	141	9.00	-6.3
6	Jack Kochanowicz J. Kochanowicz	133	2025	LAA	6	1	4	.200	6	5.29	19	0	0	0	32.1	35	19	20	6	12	2	0	2	140	1	5.29	3.34	1.58	1.67	13.6	8.6	1.45	.287	5.57	5.59	134	9.74	-4.9
7	Aaron Nola A. Nola	131	2025	PHI	6	0	5	.000	6	5.40	37	0	0	0	35.0	37	21	22	6	12	1	0	0	150	1	9.51	3.09	3.08	1.54	24.7	8.0	1.40	.330	5.66	4.28	105	9.51	-0.8
8	Jeffrey Springs J. Springs	127	2025	ATH	7	4	3	.571	7	4.98	28	0	0	0	34.1	32	19	25	5	17	0	0	0	153	0	7.34	4.46	1.65	1.31	18.3	11.1	1.43	.262	6.55	4.80	119	8.39	-2.9
9	Sean Burke S. Burke	124	2025	CWS	7	2	4	.333	6	4.91	25	0	0	0	33.0	31	18	22	7	14	3	0	0	147	1	6.82	3.82	1.79	1.91	17.0	9.5	1.36	.245	6.00	5.84	140	8.45	-5.9
10	Luis L. Ortiz L. L. Ortiz	123	2025	CLE	6	2	3	.400	6	4.78	36	0	0	0	32.0	29	17	17	4	16	0	0	0	140	0	10.13	4.50	2.25	1.13	25.7	11.4	1.41	.298	4.78	3.93	98	8.16	0.3
11	Kyle Freeland K. Freeland	123	2025	COL	7	0	4	.000	7	5.70	28	0	0	0	36.1	47	23	25	3	6	1	0	0	161	0	6.94	1.49	4.67	0.74	17.4	3.7	1.46	.358	6.19	3.16	76	11.64	4
12	Taj Bradley T. Bradley	122	2025	TBR	6	2	2	.500	6	4.58	29	0	0	0	35.1	32	18	18	4	15	1	0	0	147	0	7.39	3.82	1.93	1.02	19.7	10.2	1.33	.286	4.58	4.24	108	8.15	-1.3
13	Zac Gallen Z. Gallen	119	2025	AZ	7	2	4	.333	7	4.93	43	0	0	0	38.1	32	21	21	6	18	1	0	0	166	1	10.10	4.23	2.39	1.41	25.9	10.8	1.30	.265	4.93	4.33	112	7.51	-2.1
14	Antonio Senzatela A. Senzatela	118	2025	COL	7	1	5	.167	7	5.50	17	0	0	0	34.1	57	21	23	8	7	1	0	0	160	1	4.46	1.83	2.43	2.10	10.6	4.4	1.86	.386	6.03	5.79	139	14.94	-5.8
15	Chris Sale C. Sale	116	2025	ATL	7	1	3	.250	7	4.84	46	0	0	0	35.1	41	19	20	5	9	3	0	0	157	2	11.72	2.29	5.11	1.27	29.3	5.7	1.42	.383	5.09	3.31	85	10.44	2.3
16	Kevin Gausman K. Gausman	116	2025	TOR	6	2	3	.400	6	4.50	28	0	0	0	34.0	24	17	18	4	11	0	0	1	132	0	7.41	2.91	2.55	1.06	21.2	8.3	1.03	.225	4.76	3.91	97	6.35	0.5
17	Framber Valdez F. Valdez	113	2025	HOU	7	1	4	.200	7	4.39	37	1	0	0	41.0	37	20	20	4	15	2	0	0	171	2	8.12	3.29	2.47	0.88	21.6	8.8	1.27	.292	4.39	3.76	94	8.12	1.1
18	Tanner Bibee T. Bibee	113	2025	CLE	6	2	2	.500	6	4.36	25	0	0	0	33.0	29	16	16	9	14	1	0	0	136	0	6.82	3.82	1.79	2.45	18.4	10.3	1.30	.230	4.36	6.45	161	7.91	-9.1
19	Ryan Pepiot R. Pepiot	113	2025	TBR	7	2	4	.333	7	4.23	35	0	0	0	38.1	40	18	19	8	14	1	0	0	167	2	8.22	3.29	2.50	1.88	21.0	8.4	1.41	.294	4.46	5.11	130	9.39	-5.3
20	Justin Verlander J. Verlander	110	2025	SFG	7	0	2	.000	7	4.38	32	0	0	0	37.0	35	18	20	5	13	0	0	0	157	0	7.78	3.16	2.46	1.22	20.4	8.3	1.30	.280	4.86	4.13	108	8.51	-1.4
21	Jonathan Cannon J. Cannon	108	2025	CWS	7	2	3	.400	6	4.26	32	0	0	0	38.0	38	18	18	5	17	2	0	0	169	2	7.58	4.03	1.88	1.18	18.9	10.1	1.45	.292	4.26	4.58	110	9.00	-1.6
22	Yusei Kikuchi Y. Kikuchi	106	2025	LAA	7	0	4	.000	7	4.21	33	0	0	0	36.1	37	17	18	6	19	1	0	0	162	1	8.17	4.71	1.74	1.49	20.4	11.7	1.54	.301	4.46	5.04	121	9.17	-3.4
23	Mitch Keller M. Keller	104	2025	PIT	7	1	3	.250	7	4.38	29	0	0	0	39.0	41	19	21	3	12	4	0	0	173	1	6.69	2.77	2.42	0.69	16.8	6.9	1.36	.304	4.85	3.80	95	9.46	0.8
24	José Berríos J. Berríos	103	2025	TOR	7	1	1	.500	7	3.98	36	0	0	0	40.2	40	18	18	6	16	0	0	0	171	1	7.97	3.54	2.25	1.33	21.1	9.4	1.38	.301	3.98	4.38	108	8.85	-1.5
25	Shane Baz S. Baz	103	2025	TBR	6	3	1	.750	6	3.86	37	0	0	0	35.0	29	15	15	4	12	2	0	0	142	0	9.51	3.09	3.08	1.03	26.1	8.5	1.17	.287	3.86	3.63	92	7.46	1.1