Zac Gallen has the worst ERA this season, with an ERA of 5.60.

Interpreted as:

highest scorer in each era with a minimum of 1 IP per team game 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	Zac Gallen Z. Gallen	5.60	2025	AZ	16	5	8	.385	16	86	0	0	0	91.2	87	57	60	17	41	2	0	1	399	1	8.44	4.03	2.10	1.67	21.6	10.3	1.40	.277	5.89	136	5.00	129	8.54	-11.9
2	Jack Kochanowicz J. Kochanowicz	5.38	2025	LAA	15	3	8	.273	15	58	0	0	0	77.0	83	46	47	15	36	5	0	2	337	3	6.78	4.21	1.61	1.75	17.2	10.7	1.55	.305	5.49	132	5.68	136	9.70	-12.3
3	Brandon Pfaadt B. Pfaadt	5.38	2025	AZ	15	8	4	.667	15	58	0	0	0	75.1	86	45	47	15	19	9	0	1	333	2	6.93	2.27	3.05	1.79	17.4	5.7	1.39	.306	5.62	131	5.22	135	10.27	-11.7
4	Taj Bradley T. Bradley	4.95	2025	TBR	15	4	5	.444	15	73	0	0	0	80.0	74	44	52	12	34	4	0	0	343	0	8.21	3.83	2.15	1.35	21.3	9.9	1.35	.282	5.85	129	4.61	117	8.33	-6.2
5	Jack Flaherty J. Flaherty	4.83	2025	DET	15	5	8	.385	15	93	0	0	0	78.1	64	42	43	15	31	3	0	0	327	1	10.69	3.56	3.00	1.72	28.4	9.5	1.21	.265	4.94	122	4.48	111	7.35	-4
6	Michael Lorenzen M. Lorenzen	4.81	2025	KCR	15	4	7	.364	15	69	0	0	0	82.1	85	44	46	14	28	2	0	0	357	10	7.54	3.06	2.46	1.53	19.3	7.8	1.37	.291	5.03	115	4.69	115	9.29	-5.7
7	Dean Kremer D. Kremer	4.80	2025	BAL	15	6	7	.462	14	65	0	0	0	84.1	92	45	47	12	23	1	0	0	361	5	6.94	2.45	2.83	1.28	18.0	6.4	1.36	.308	5.02	123	4.22	106	9.82	-2.3
8	Kyle Hendricks K. Hendricks	4.79	2025	LAA	14	5	6	.455	14	53	0	0	0	77.0	77	41	42	12	22	4	0	3	326	0	6.19	2.57	2.41	1.40	16.3	6.7	1.29	.277	4.91	118	4.72	113	9.00	-4.3
9	Shane Baz S. Baz	4.79	2025	TBR	15	7	3	.700	15	77	0	0	0	82.2	76	44	44	14	34	5	0	0	352	0	8.38	3.70	2.26	1.52	21.9	9.7	1.33	.279	4.79	125	4.81	122	8.27	-8.3
10	Dylan Cease D. Cease	4.69	2025	SDP	15	2	6	.250	15	105	0	0	0	80.2	77	42	44	8	30	2	0	1	346	2	11.71	3.35	3.50	0.89	30.3	8.7	1.33	.343	4.91	120	2.94	74	8.59	9.3
11	Luis L. Ortiz L. L. Ortiz	4.64	2025	CLE	14	3	8	.273	14	81	0	0	0	75.2	72	39	40	10	39	1	0	0	331	0	9.63	4.64	2.08	1.19	24.5	11.8	1.47	.310	4.76	117	4.22	105	8.56	-1.7
12	Kevin Gausman K. Gausman	4.60	2025	TOR	15	5	6	.455	15	84	0	0	0	86.0	73	44	45	12	24	2	0	1	348	0	8.79	2.51	3.50	1.26	24.1	6.9	1.13	.270	4.71	116	3.83	94	7.64	2.3
13	Mitchell Parker M. Parker	4.59	2025	WSH	15	4	8	.333	15	58	0	0	0	80.1	75	41	45	9	31	3	0	0	344	2	6.50	3.47	1.87	1.01	16.9	9.0	1.32	.272	5.04	114	4.34	107	8.40	-2.6
14	Tyler Anderson T. Anderson	4.56	2025	LAA	15	2	5	.286	15	65	0	0	0	81.0	82	41	45	15	31	3	0	3	357	5	7.22	3.44	2.10	1.67	18.2	8.7	1.40	.276	5.00	112	5.12	122	9.11	-8.1
15	Bailey Ober B. Ober	4.54	2025	MIN	15	4	4	.500	15	62	1	0	0	79.1	90	40	41	14	21	3	0	0	348	1	7.03	2.38	2.95	1.59	17.8	6.0	1.40	.306	4.65	114	4.70	116	10.21	-5.6
16	Andre Pallante A. Pallante	4.48	2025	STL	15	5	3	.625	15	58	0	0	0	82.1	81	41	43	11	27	1	0	0	352	5	6.34	2.95	2.15	1.20	16.5	7.7	1.31	.275	4.70	112	4.41	112	8.85	-4.6
17	Chris Paddack C. Paddack	4.48	2025	MIN	15	3	6	.333	15	56	0	0	0	80.1	76	40	43	11	23	1	0	0	336	2	6.27	2.58	2.43	1.23	16.7	6.8	1.23	.265	4.82	112	4.34	107	8.51	-2.5
18	Nick Martinez N. Martinez	4.45	2025	CIN	16	4	8	.333	15	62	0	0	0	85.0	87	42	43	13	19	4	0	0	351	5	6.56	2.01	3.26	1.38	17.7	5.4	1.25	.292	4.55	103	4.40	104	9.21	-1.2
19	Luis Severino L. Severino	4.42	2025	ATH	16	2	7	.222	16	66	0	0	0	95.2	98	47	50	7	30	5	0	1	416	1	6.21	2.82	2.20	0.66	15.9	7.2	1.34	.295	4.70	111	3.73	92	9.22	3.6
20	Jesús Luzardo J. Luzardo	4.41	2025	PHI	15	6	3	.667	15	97	0	0	0	83.2	92	41	44	7	28	1	0	0	361	1	10.43	3.01	3.46	0.75	26.9	7.8	1.43	.373	4.73	108	2.87	70	9.90	11.1
21	Jeffrey Springs J. Springs	4.24	2025	ATH	16	6	5	.545	14	72	0	0	0	87.0	75	41	50	13	32	1	0	0	369	0	7.45	3.31	2.25	1.34	19.5	8.7	1.23	.247	5.17	106	4.49	110	7.76	-4
22	Jake Irvin J. Irvin	4.23	2025	WSH	15	5	3	.625	15	59	0	0	0	89.1	84	42	42	14	26	2	0	0	375	1	5.94	2.62	2.27	1.41	15.7	6.9	1.23	.255	4.23	105	4.72	117	8.46	-6.6
23	Brady Singer B. Singer	4.13	2025	CIN	15	7	5	.583	15	67	0	0	0	80.2	72	37	40	9	33	3	0	0	341	0	7.48	3.68	2.03	1.00	19.6	9.7	1.30	.275	4.46	96	4.19	99	8.03	0.7
24	Matthew Liberatore M. Liberatore	4.08	2025	STL	14	4	6	.400	14	66	0	0	0	79.1	81	36	38	7	11	2	0	0	329	2	7.49	1.25	6.00	0.79	20.1	3.3	1.16	.305	4.31	102	3.03	77	9.19	7.9
25	Mitch Keller M. Keller	4.08	2025	PIT	15	1	9	.100	15	68	0	0	0	88.1	88	40	43	6	22	4	0	0	373	2	6.93	2.24	3.09	0.61	18.2	5.9	1.25	.300	4.38	98	3.29	82	8.97	7