Dylan Covey had the highest ERA by a starting pitcher in 2023, with an ERA of 67.50.

	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	H/9
1	Dylan Covey D. Covey	67.50	2023	PHI	1	0	1	.000	1	0	0	0	0	0.2	6	5	7	2	0	0	0	0	9	0	0.00	0.00		27.00	0.0	0.0	9.00	.571	94.50	81.00
2	Steven Okert S. Okert	45.00	2023	MIA	2	0	1	.000	2	1	0	0	0	1.0	7	5	5	2	0	0	0	0	10	0	9.00	0.00		18.00	10.0	0.0	7.00	.714	45.00	63.00
3	Francisco Pérez F. Pérez	27.00	2023	OAK	1	0	0		1	1	0	0	0	1.0	4	3	3	0	0	0	0	0	7	0	9.00	0.00		0.00	14.3	0.0	4.00	.667	27.00	36.00
4	Sam Long S. Long	27.00	2023	OAK	1	0	1	.000	1	2	0	0	0	1.0	3	3	3	0	1	0	0	0	7	0	18.00	9.00	2.00	0.00	28.6	14.3	4.00	.750	27.00	27.00
5	Justin Garza J. Garza	27.00	2023	BOS	1	0	1	.000	1	2	0	0	0	1.0	4	3	3	2	0	0	0	0	7	0	18.00	0.00		18.00	28.6	0.0	4.00	.667	27.00	36.00
6	Adam Oller A. Oller	27.00	2023	OAK	1	0	0		1	2	0	0	0	2.1	8	7	7	1	1	1	0	0	17	0	7.71	3.86	2.00	3.86	11.8	5.9	3.86	.583	27.00	30.86
7	Reiss Knehr R. Knehr	22.50	2023	SDP	1	0	1	.000	1	1	0	0	0	2.0	6	5	5	2	2	0	0	0	14	0	4.50	9.00	0.50	9.00	7.1	14.3	4.00	.444	22.50	27.00
8	Michael Plassmeyer M. Plassmeyer	22.09	2023	PHI	1	0	1	.000	1	4	0	0	0	3.2	8	9	10	3	0	3	0	0	23	0	9.82	0.00		7.36	17.4	0.0	2.18	.385	24.55	19.64
9	Wes Parsons W. Parsons	20.25	2023	TOR	1	0	1	.000	1	3	0	0	0	4.0	10	9	9	2	3	1	0	0	26	2	6.75	6.75	1.00	4.50	11.5	11.5	3.25	.471	20.25	22.50
10	Joe Jacques J. Jacques	20.25	2023	BOS	1	0	0		1	1	0	0	0	1.1	4	3	3	2	1	0	0	0	9	0	6.75	6.75	1.00	13.50	11.1	11.1	3.75	.400	20.25	27.00
11	Caleb Kilian C. Kilian	18.90	2023	CHC	1	0	1	.000	1	4	0	0	0	3.1	10	7	7	0	2	2	0	0	23	1	10.80	5.40	2.00	0.00	17.4	8.7	3.60	.667	18.90	27.00
12	José Ruiz J. Ruiz	16.20	2023	ARI	1	0	0		1	1	0	0	0	1.2	5	3	3	2	0	0	0	0	9	0	5.40	0.00		10.80	11.1	0.0	3.00	.500	16.20	27.00
13	Shintaro Fujinami S. Fujinami	14.26	2023	OAK	7	0	6	.000	7	14	0	0	0	17.2	26	28	28	4	12	3	0	0	94	2	7.13	6.11	1.17	2.04	14.9	12.8	2.15	.361	14.26	13.25
14	Gavin Stone G. Stone	13.50	2023	LAD	4	0	0		4	7	0	0	0	15.1	32	23	24	3	8	0	0	0	84	0	4.11	4.70	0.88	1.76	8.3	9.5	2.61	.439	14.09	18.78
15	Levi Stoudt L. Stoudt	12.86	2023	CIN	2	0	1	.000	2	5	0	0	0	7.0	13	10	10	1	4	0	0	0	38	0	6.43	5.14	1.25	1.29	13.2	10.5	2.43	.429	12.86	16.71
16	Luis Patiño L. Patiño	11.57	2023	CWS	1	0	1	.000	1	3	0	0	0	2.1	3	3	3	0	2	0	0	0	12	1	11.57	7.71	1.50	0.00	25.0	16.7	2.14	.429	11.57	11.57
17	Connor Overton C. Overton	11.45	2023	CIN	3	0	1	.000	3	9	0	0	0	11.0	19	14	14	3	7	0	0	0	55	0	7.36	5.73	1.29	2.45	16.4	12.7	2.36	.444	11.45	15.55
18	Karl Kauffmann K. Kauffmann	11.37	2023	COL	3	0	3	.000	3	7	0	0	0	12.2	22	16	17	3	7	1	0	0	64	0	4.97	4.97	1.00	2.13	10.9	10.9	2.29	.413	12.08	15.63
19	Kyle Nelson K. Nelson	10.80	2023	ARI	2	0	1	.000	2	4	0	0	0	1.2	2	2	3	1	1	0	0	0	9	0	21.60	5.40	4.00	5.40	44.4	11.1	1.80	.333	16.20	10.80
20	Dinelson Lamet D. Lamet	10.80	2023	COL	4	0	3	.000	4	18	0	0	0	15.0	24	18	19	4	10	1	0	0	77	2	10.80	6.00	1.80	2.40	23.4	13.0	2.27	.455	11.40	14.40
21	Spenser Watkins S. Watkins	10.38	2023	OAK	1	0	1	.000	1	4	0	0	0	4.1	7	5	5	2	2	0	0	0	21	0	8.31	4.15	2.00	4.15	19.0	9.5	2.08	.385	10.38	14.54
22	Madison Bumgarner M. Bumgarner	10.26	2023	ARI	4	0	3	.000	4	10	0	0	0	16.2	25	19	20	4	15	1	0	0	90	0	5.40	8.10	0.67	2.16	11.1	16.7	2.40	.350	10.80	13.50
23	Freddy Tarnok F. Tarnok	10.13	2023	OAK	1	0	0		1	4	0	0	0	2.2	3	3	3	1	1	0	0	0	12	1	13.50	3.38	4.00	3.38	33.3	8.3	1.50	.333	10.13	10.13
24	Denyi Reyes D. Reyes	9.82	2023	NYM	3	0	2	.000	3	8	0	0	0	11.0	16	12	12	3	5	1	0	0	54	0	6.55	4.09	1.60	2.45	14.8	9.3	1.91	.351	9.82	13.09
25	Chad Kuhl C. Kuhl	9.41	2023	WSH	5	0	2	.000	5	18	0	0	0	22.0	27	23	23	5	16	1	0	1	107	2	7.36	6.55	1.13	2.05	16.8	15.0	1.95	.328	9.41	11.05