Sean Guenther has the worst ERA by a starting pitcher this season, with an ERA of 27.00.

Interpreted as:

starting pitcher worst era 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	Sean Guenther S. Guenther	27.00	2025	DET	1	0	1	.000	1	0	0	0	0	0.1	3	1	1	0	0	0	0	0	3	0	0.00	0.00		0.00	0.0	0.0	9.00	1.000	27.00	81.00
2	Chase Petty C. Petty	21.94	2025	CIN	2	0	2	.000	2	7	0	0	0	5.1	13	13	13	3	8	0	0	0	36	0	11.81	13.50	0.88	5.06	19.4	22.2	3.94	.556	21.94	21.94
3	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
4	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
5	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
6	Kyle Gibson K. Gibson	16.78	2025	BAL	4	0	3	.000	4	10	0	0	0	12.1	29	23	23	7	7	0	0	0	73	1	7.30	5.11	1.43	5.11	13.7	9.6	2.92	.449	16.78	21.16
7	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
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	Bradley Blalock B. Blalock	14.54	2025	COL	3	0	2	.000	3	6	0	0	0	13.0	22	21	21	4	6	0	0	0	65	2	4.15	4.15	1.00	2.77	9.2	9.2	2.15	.367	14.54	15.23
10	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
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	Chayce McDermott C. McDermott	12.00	2025	BAL	1	0	0		1	5	0	0	0	3.0	4	4	4	1	3	1	0	0	16	0	15.00	9.00	1.67	3.00	31.3	18.8	2.33	.500	12.00	12.00
13	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
14	George Kirby G. Kirby	11.42	2025	SEA	2	0	2	.000	2	8	0	0	0	8.2	13	11	11	3	3	2	0	0	42	1	8.31	3.12	2.67	3.12	19.0	7.1	1.85	.385	11.42	13.50
15	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
16	Sean Reynolds S. Reynolds	10.13	2025	SDP	1	0	1	.000	1	1	0	0	0	2.2	6	3	3	1	0	1	0	0	14	0	3.38	0.00		3.38	7.1	0.0	2.25	.455	10.13	20.25
17	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
18	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
19	Charlie Morton C. Morton	8.80	2025	BAL	7	1	6	.143	7	28	0	0	0	30.2	39	30	30	7	18	3	0	0	149	0	8.22	5.28	1.56	2.05	18.8	12.1	1.86	.344	8.80	11.45
20	Carson Palmquist C. Palmquist	8.78	2025	COL	3	0	3	.000	3	6	0	0	0	13.1	19	13	14	2	8	0	0	0	66	1	4.05	5.40	0.75	1.35	9.1	12.1	2.03	.340	9.45	12.83
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	Mike Burrows M. Burrows	8.64	2025	PIT	2	0	1	.000	2	5	0	0	0	8.1	9	8	9	3	4	1	0	0	39	0	5.40	4.32	1.25	3.24	12.8	10.3	1.56	.231	9.72	9.72
23	Sandy Alcantara S. Alcantara	8.47	2025	MIA	11	2	7	.222	11	40	0	0	0	51.0	56	48	49	8	29	2	0	0	237	4	7.06	5.12	1.38	1.41	16.9	12.2	1.67	.304	8.65	9.88
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	Tanner Houck T. Houck	8.04	2025	BOS	9	0	3	.000	9	32	0	0	0	43.2	57	39	41	10	17	5	0	0	203	2	6.60	3.50	1.88	2.06	15.8	8.4	1.69	.338	8.45	11.75