Chase Petty has the worst ERA by a starting pitcher this season, with an ERA of 34.71.

Interpreted as:

worst era of a starting pitcher 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	H/9
1	Chase Petty C. Petty	34.71	2025	CIN	1	0	1	.000	1	3	0	0	0	2.1	7	9	9	2	2	0	0	0	16	0	11.57	7.71	1.50	7.71	18.8	12.5	3.86	.556	34.71	27.00
2	Yariel Rodríguez Y. Rodríguez	18.00	2025	TOR	1	0	0		1	1	0	0	0	1.0	2	2	2	1	2	0	0	0	6	1	9.00	18.00	0.50	9.00	16.7	33.3	4.00	.500	18.00	18.00
3	Doug Nikhazy D. Nikhazy	18.00	2025	CLE	1	0	1	.000	1	3	0	0	0	3.0	5	6	6	0	6	0	0	0	20	1	9.00	18.00	0.50	0.00	15.0	30.0	3.67	.455	18.00	15.00
4	Bobby Miller B. Miller	18.00	2025	LAD	1	0	0		1	7	0	0	0	3.0	8	6	6	2	1	0	0	0	18	0	21.00	3.00	7.00	6.00	38.9	5.6	3.00	.750	18.00	24.00
5	Ranger Suárez R. Suárez	17.18	2025	PHI	1	0	0		1	6	0	0	0	3.2	7	7	7	0	2	0	0	0	20	0	14.73	4.91	3.00	0.00	30.0	10.0	2.45	.583	17.18	17.18
6	Joey Estes J. Estes	15.43	2025	ATH	2	0	2	.000	2	5	0	0	0	7.0	15	12	12	4	6	1	0	0	42	0	6.43	7.71	0.83	5.14	11.9	14.3	3.00	.423	15.43	19.29
7	Aaron Civale A. Civale	15.00	2025	MIL	1	0	1	.000	1	2	0	0	0	3.0	4	5	5	3	1	0	0	1	14	0	6.00	3.00	2.00	9.00	14.3	7.1	1.67	.125	15.00	12.00
8	Blade Tidwell B. Tidwell	14.73	2025	NYM	1	0	1	.000	1	2	0	0	0	3.2	9	6	6	1	3	1	0	0	23	0	4.91	7.36	0.67	2.45	8.7	13.0	3.27	.500	14.73	22.09
9	Justin Wrobleski J. Wrobleski	14.40	2025	LAD	1	0	1	.000	1	4	0	0	0	5.0	8	8	8	2	3	0	0	0	26	0	7.20	5.40	1.33	3.60	15.4	11.5	2.20	.353	14.40	14.40
10	Kyle Gibson K. Gibson	14.09	2025	BAL	2	0	1	.000	2	5	0	0	0	7.2	16	12	12	6	3	0	0	0	42	0	5.87	3.52	1.67	7.04	11.9	7.1	2.48	.357	14.09	18.78
11	Thomas Harrington T. Harrington	13.50	2025	PIT	1	0	1	.000	1	2	0	0	0	4.0	7	6	6	1	4	0	0	0	23	1	4.50	9.00	0.50	2.25	8.7	17.4	2.75	.375	13.50	15.75
12	Marcus Stroman M. Stroman	11.57	2025	NYY	3	0	1	.000	3	7	0	0	0	9.1	12	12	12	2	7	0	0	0	47	0	6.75	6.75	1.00	1.93	14.9	14.9	2.04	.323	11.57	11.57
13	Elvin Rodríguez E. Rodríguez	11.00	2025	MIL	2	0	2	.000	2	5	0	0	0	9.0	14	11	11	5	2	1	0	0	42	0	5.00	2.00	2.50	5.00	11.9	4.8	1.78	.310	11.00	14.00
14	Charlie Morton C. Morton	10.22	2025	BAL	6	0	6	.000	6	23	0	0	0	24.2	35	28	28	6	16	2	0	0	125	0	8.39	5.84	1.44	2.19	18.4	12.8	2.07	.372	10.22	12.77
15	Jacob Lopez J. Lopez	10.13	2025	ATH	1	0	1	.000	1	4	0	0	0	2.2	6	3	3	0	4	1	0	0	18	0	13.50	13.50	1.00	0.00	22.2	22.2	3.75	.667	10.13	20.25
16	Germán Márquez G. Márquez	9.90	2025	COL	7	0	6	.000	7	18	0	0	0	30.0	47	33	35	4	12	2	0	0	146	2	5.40	3.60	1.50	1.20	12.3	8.2	1.97	.391	10.50	14.10
17	Brandon Eisert B. Eisert	9.00	2025	CWS	1	0	0		1	0	0	0	0	1.0	2	1	1	0	0	0	0	0	5	0	0.00	0.00		0.00	0.0	0.0	2.00	.400	9.00	18.00
18	Justin Topa J. Topa	9.00	2025	MIN	1	0	0		1	1	0	0	0	1.0	3	1	1	0	0	0	0	0	6	0	9.00	0.00		0.00	16.7	0.0	3.00	.600	9.00	27.00
19	Nestor Cortes N. Cortes	9.00	2025	MIL	2	1	1	.500	2	8	0	0	0	8.0	7	8	8	5	7	0	0	0	38	0	9.00	7.88	1.14	5.63	21.1	18.4	1.75	.111	9.00	7.88
20	Bradley Blalock B. Blalock	8.68	2025	COL	2	0	1	.000	2	5	0	0	0	9.1	9	9	9	1	4	0	0	0	39	1	4.82	3.86	1.25	0.96	12.8	10.3	1.39	.276	8.68	8.68
21	Connor Gillispie C. Gillispie	8.65	2025	MIA	6	0	3	.000	6	23	0	0	0	26.0	32	25	26	6	11	1	0	0	123	1	7.96	3.81	2.09	2.08	18.7	8.9	1.65	.317	9.00	11.08
22	Sandy Alcantara S. Alcantara	8.42	2025	MIA	7	2	4	.333	7	23	0	0	0	31.0	32	29	29	6	18	0	0	0	142	4	6.68	5.23	1.28	1.74	16.2	12.7	1.61	.274	8.42	9.29
23	Lucas Giolito L. Giolito	8.38	2025	BOS	2	0	1	.000	2	9	0	0	0	9.2	15	9	9	2	3	0	0	0	45	1	8.38	2.79	3.00	1.86	20.0	6.7	1.86	.419	8.38	13.97
24	Kumar Rocker K. Rocker	8.10	2025	TEX	5	1	3	.250	5	16	0	0	0	20.0	30	18	19	3	5	1	0	0	95	3	7.20	2.25	3.20	1.35	16.8	5.3	1.75	.386	8.55	13.50
25	Chase Dollander C. Dollander	7.71	2025	COL	6	2	3	.400	6	25	0	0	0	28.0	33	24	27	8	13	1	0	0	130	1	8.04	4.18	1.92	2.57	19.2	10.0	1.64	.301	8.68	10.61