Jordan Lyles had the highest ERA in 2023, with an ERA of 6.28.

Interpreted as:

highest era with a minimum of 1 IP per team game by player in 2023

	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	Jordan Lyles J. Lyles	6.28	2023	KCR	31	6	17	.261	31	120	3	0	0	177.2	176	124	130	39	45	6	0	0	748	10	6.08	2.28	2.67	1.98	16.0	6.0	1.24	.255	6.59	140	5.62	131	8.92	-26.3
2	Lance Lynn L. Lynn	5.73	2023	TOT	32	13	11	.542	32	191	0	0	0	183.2	189	117	127	44	67	9	0	1	808	3	9.36	3.28	2.85	2.16	23.6	8.3	1.39	.292	6.22	133	5.53	125	9.26	-21.7
3	Patrick Corbin P. Corbin	5.20	2023	WSH	32	10	15	.400	32	124	0	0	0	180.0	210	104	113	33	57	4	0	0	790	6	6.20	2.85	2.18	1.65	15.7	7.2	1.48	.309	5.65	120	5.27	119	10.50	-16.9
4	Lucas Giolito L. Giolito	4.88	2023	TOT	33	7	15	.318	33	204	0	0	0	184.1	169	100	110	41	73	9	0	2	794	5	9.96	3.56	2.79	2.00	25.7	9.2	1.31	.274	5.37	113	5.26	120	8.25	-17.8
5	Miles Mikolas M. Mikolas	4.78	2023	STL	35	9	13	.409	35	137	0	0	0	201.1	226	107	110	26	39	8	0	0	860	4	6.12	1.74	3.51	1.16	15.9	4.5	1.32	.308	4.92	111	4.27	100	10.10	0.2
6	Kyle Gibson K. Gibson	4.73	2023	BAL	33	14	9	.609	33	157	0	0	0	192.0	198	101	101	23	55	6	0	0	807	8	7.36	2.58	2.85	1.08	19.5	6.8	1.32	.309	4.73	113	4.13	98	9.28	1.3
7	Dylan Cease D. Cease	4.58	2023	CWS	33	7	9	.438	33	214	0	0	0	177.0	172	90	98	19	79	9	0	3	784	13	10.88	4.02	2.71	0.97	27.3	10.1	1.42	.330	4.98	106	3.72	84	8.75	13.4
8	Cristian Javier C. Javier	4.56	2023	HOU	31	10	4	.714	31	159	0	0	0	162.0	143	82	85	25	62	7	0	0	687	4	8.83	3.44	2.56	1.39	23.1	9.0	1.27	.272	4.72	108	4.57	108	7.94	-6.1
9	JP Sears	4.54	2023	OAK	32	5	12	.294	32	161	0	0	0	172.1	165	87	90	34	53	16	0	2	735	2	8.41	2.77	3.04	1.78	21.9	7.2	1.26	.278	4.70	111	5.15	124	8.62	-19.9
10	Aaron Nola A. Nola	4.46	2023	PHI	32	12	9	.571	32	202	0	0	0	193.2	178	96	105	32	45	1	0	0	793	2	9.39	2.09	4.49	1.49	25.5	5.7	1.15	.285	4.88	102	4.03	90	8.27	9.4
11	Taijuan Walker T. Walker	4.38	2023	PHI	31	15	6	.714	31	138	0	0	0	172.2	155	84	87	20	71	8	0	1	733	3	7.19	3.70	1.94	1.04	18.8	9.7	1.31	.272	4.53	100	4.53	102	8.08	-1.2
12	Johan Oviedo J. Oviedo	4.31	2023	PIT	32	9	14	.391	32	158	1	1	0	177.2	161	85	91	19	83	13	0	1	781	7	8.00	4.20	1.90	0.96	20.2	10.6	1.37	.280	4.61	96	4.48	102	8.16	-2.2
13	Mitch Keller M. Keller	4.21	2023	PIT	32	13	9	.591	32	210	1	1	0	194.1	187	91	97	25	55	12	0	0	825	5	9.73	2.55	3.82	1.16	25.5	6.7	1.25	.310	4.49	94	3.80	87	8.66	12.5
14	Sandy Alcantara S. Alcantara	4.14	2023	MIA	28	7	12	.368	28	151	3	1	0	184.2	176	85	91	22	48	5	0	0	762	4	7.36	2.34	3.15	1.07	19.8	6.3	1.21	.287	4.44	93	4.03	92	8.58	7.2
15	Dean Kremer D. Kremer	4.12	2023	BAL	32	13	5	.722	32	157	0	0	0	172.2	171	79	85	27	55	5	0	0	735	5	8.18	2.87	2.85	1.41	21.4	7.5	1.31	.293	4.43	98	4.51	107	8.91	-6.3
16	Yusei Kikuchi Y. Kikuchi	3.86	2023	TOR	32	11	6	.647	32	181	0	0	0	167.2	165	72	78	27	48	4	0	0	700	7	9.72	2.58	3.77	1.45	25.9	6.9	1.27	.314	4.19	91	4.12	96	8.86	3.1
17	Freddy Peralta F. Peralta	3.86	2023	MIL	30	12	10	.545	30	210	0	0	0	165.2	131	71	77	26	54	6	0	0	680	6	11.41	2.93	3.89	1.41	30.9	7.9	1.12	.273	4.18	88	3.84	87	7.12	10.6
18	Spencer Strider S. Strider	3.86	2023	ATL	32	19	5	.792	32	281	0	0	0	186.2	146	80	85	22	58	9	0	1	763	6	13.55	2.80	4.84	1.06	36.8	7.6	1.09	.316	4.10	87	2.85	66	7.04	30.3
19	Bryce Elder B. Elder	3.81	2023	ATL	31	12	4	.750	31	128	0	0	0	174.2	160	74	79	19	63	8	0	0	732	11	6.60	3.25	2.03	0.98	17.5	8.6	1.28	.274	4.07	86	4.42	103	8.24	-2.7
20	Logan Gilbert L. Gilbert	3.73	2023	SEA	32	12	7	.632	32	189	1	1	0	190.2	169	79	82	29	36	2	0	1	770	6	8.92	1.70	5.25	1.37	24.5	4.7	1.08	.272	3.87	93	3.84	94	7.98	5.6
21	Dane Dunning D. Dunning	3.70	2023	TEX	35	12	7	.632	26	140	0	0	0	172.2	163	71	73	20	55	10	2	0	722	6	7.30	2.87	2.55	1.04	19.4	7.6	1.26	.288	3.81	87	4.27	98	8.50	2.1
22	Pablo López P. López	3.66	2023	MIN	32	11	8	.579	32	234	1	1	0	194.0	176	79	81	24	48	9	0	1	801	7	10.86	2.23	4.88	1.11	29.2	6.0	1.15	.313	3.76	86	3.33	78	8.16	20.5
23	José Berríos J. Berríos	3.65	2023	TOR	32	11	12	.478	32	184	0	0	0	189.2	173	77	82	25	52	9	0	3	782	4	8.73	2.47	3.54	1.19	23.5	6.6	1.19	.289	3.89	86	3.99	93	8.21	6.1
24	Charlie Morton C. Morton	3.64	2023	ATL	30	14	12	.538	30	183	0	0	0	163.1	150	66	70	14	83	12	0	2	716	4	10.08	4.57	2.20	0.77	25.6	11.6	1.43	.321	3.86	82	3.87	90	8.27	7.6
25	Zack Wheeler Z. Wheeler	3.61	2023	PHI	32	13	6	.684	32	212	0	0	0	192.0	168	77	82	20	39	9	0	0	787	1	9.94	1.83	5.44	0.94	26.9	5.0	1.08	.292	3.84	82	3.15	71	7.88	27.7