best single season era by a pitcher ever red sox 1890 to 2023 minimum 50 innings

Between the 1890 and 2023 seasons, Jonathan Papelbon had the lowest ERA for the Red Sox with 50.0+ innings pitched in a season, with an ERA of 0.92 in his rookie season in 2006.

	NAME	ERA	IP	SEASON	TM	G	W	L	W%	GS	SO	CG	SHO	SV	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	Jonathan Papelbon J. Papelbon	0.92	68.1	2006	BOS	59	4	2	.667	0	75	0	0	35	40	7	8	3	13	1	49	2	257	2	9.88	1.71	5.77	0.40	29.2	5.1	0.78	.224	1.05	20	2.13	48	5.27	17.7
2	Dutch Leonard D. Leonard	0.96	224.2	1914	BSA	36	19	5	.792	25	176	17	7	3	139	24	34	3	60	8	8		842	2	7.05	2.40	2.93	0.12	20.9	7.1	0.89	.229	1.36	36	1.95	70	5.57	20.4
3	Chris Martin C. Martin	1.05	51.1	2023	BOS	55	4	1	.800	0	46	0	0	3	45	6	6	2	8	0	12	3	199	1	8.06	1.40	5.75	0.35	23.1	4.0	1.03	.301	1.05	23	2.43	56	7.89	10.7
4	Koji Uehara K. Uehara	1.09	74.1	2013	BOS	73	4	1	.800	0	101	0	0	21	33	9	10	5	9	1	40	2	265	1	12.23	1.09	11.22	0.61	38.1	3.4	0.57	.188	1.21	26	1.60	41	4.00	19.1
5	Cy Young C. Young	1.26	299.0	1908	BOS	36	21	11	.656	33	150	30	3	2	230	42	68	1	37	1	3		1,116	4	4.52	1.11	4.05	0.03	13.4	3.3	0.89	.247	2.05	52	1.52	67	6.92	25.4
6	Calvin Schiraldi C. Schiraldi	1.41	51.0	1986	BOS	25	4	2	.667	0	55	0	0	9	36	8	8	5	15	1	21	2	198	1	9.71	2.65	3.67	0.88	27.8	7.6	1.00	.254	1.41	33	2.82	69	6.35	7.2
7	Craig Kimbrel C. Kimbrel	1.43	69.0	2017	BOS	67	5	0	1.000	0	126	0	0	35	33	11	11	6	14	4	51	0	254	5	16.43	1.83	9.00	0.78	49.6	5.5	0.68	.260	1.43	31	1.41	32	4.30	22.7
8	Fritz Coumbe F. Coumbe	1.44	62.1	1914	BSA	17	1	2	.333	5	17	1	0	1	49	10	20	0	16	0	10		237	1	2.45	2.31	1.06	0.00	7.2	6.8	1.04	.240	2.89	54	2.66	96	7.07	0.7
9	Joe Wood J. Wood	1.49	157.1	1915	BSA	25	15	5	.750	16	63	10	3	2	120	26	32	1	44	1	8		600	3	3.60	2.52	1.43	0.06	10.5	7.3	1.04	.242	1.83	52	2.55	88	6.86	6
10	Scott Atchison S. Atchison	1.58	51.1	2012	BOS	42	2	1	.667	0	36	0	0	0	42	9	10	2	9	0	7	3	200	2	6.31	1.58	4.00	0.35	18.0	4.5	0.99	.261	1.75	37	2.72	67	7.36	7.7
11	Ray Collins R. Collins	1.62	244.2	1910	BSA	35	13	11	.542	26	109	18	4	1	205	44	73	1	41	1	9		937	1	4.01	1.51	2.66	0.04	11.6	4.4	1.01	.260	2.69	64	2.00	76	7.54	16.9
12	Cy Young C. Young	1.62	371.1	1901	BSA	43	33	10	.767	41	158	38	5	0	324	67	112	6	37	7	2		1,440	2	3.83	0.90	4.27	0.15	11.0	2.6	0.97	.258	2.71	44	2.64	72	7.85	42.6
13	Ernie Shore E. Shore	1.64	247.0	1915	BSA	38	19	8	.704	32	102	17	4	0	207	45	75	3	66	4	3		978	4	3.72	2.40	1.55	0.11	10.4	6.7	1.11	.254	2.73	57	2.59	89	7.54	8.2
14	Joe Wood J. Wood	1.69	196.2	1910	BSA	35	12	13	.480	17	145	14	3	0	155	37	81	3	56	10	13		771	5	6.64	2.56	2.59	0.14	18.8	7.3	1.07	.273	3.71	67	2.05	78	7.09	12.4
15	Rube Foster R. Foster	1.70	211.2	1914	BSA	32	14	8	.636	27	89	17	5	0	164	40	68	2	52	7	2		813	1	3.78	2.21	1.71	0.09	10.9	6.4	1.02	.244	2.89	63	2.55	92	6.97	4.8
16	Pedro Martinez P. Martinez	1.74	217.0	2000	BOS	29	18	6	.750	29	284	7	4	0	128	42	44	17	32	14	0	0	817	1	11.78	1.33	8.88	0.71	34.8	3.9	0.74	.236	1.82	35	2.16	47	5.31	61.5
17	Carl Mays C. Mays	1.74	289.0	1917	BSA	35	22	9	.710	33	91	27	2	0	230	56	81	1	74	14	2		1,129	6	2.83	2.30	1.23	0.03	8.1	6.6	1.05	.241	2.52	69	2.59	98	7.16	0.3
18	Clay Buchholz C. Buchholz	1.74	108.1	2013	BOS	16	12	1	.923	16	96	1	1	0	75	21	23	4	36	1	0	0	416	1	7.98	2.99	2.67	0.33	23.1	8.7	1.02	.254	1.91	42	2.78	71	6.23	13.5
19	Babe Ruth B. Ruth	1.75	323.2	1916	BSA	44	23	12	.657	40	170	23	9	1	230	63	83	0	118	8	3		1,272	3	4.73	3.28	1.44	0.00	13.4	9.3	1.08	.236	2.31	65	2.43	90	6.40	8.8
20	Craig Breslow C. Breslow	1.81	59.2	2013	BOS	61	5	2	.714	0	33	0	0	0	49	12	16	3	18	2	13	0	237	2	4.98	2.72	1.83	0.45	13.9	7.6	1.12	.254	2.41	43	3.60	93	7.39	1.9
21	Frank Arellanes F. Arellanes	1.82	79.0	1908	BOS	11	4	3	.571	8	33	6	1	0	60	16	26	1	18	3	3		313	3	3.76	2.05	1.83	0.11	10.5	5.8	0.99	.229	2.96	75	2.23	98	6.84	0.7
22	Cy Young C. Young	1.82	320.2	1905	BSA	38	18	19	.486	33	210	31	4	0	248	65	99	3	30	8	5		1,189	6	5.89	0.84	7.00	0.08	17.7	2.5	0.87	.261	2.78	68	1.69	61	6.96	38.4
23	Elmer Steele E. Steele	1.83	118.0	1908	BOS	16	5	7	.417	13	37	9	1	0	85	24	34	1	13	3	2		423	0	2.82	0.99	2.85	0.08	8.7	3.1	0.83	.228	2.59	75	1.99	87	6.48	4
24	Ellis Kinder E. Kinder	1.85	107.0	1953	BOS	69	10	6	.625	0	39	0	0	27	84	22	30	8	38	2	51		441	1	3.28	3.20	1.03	0.67	8.8	8.6	1.14	.215	2.52	43	3.96	91	7.07	4.7
25	Jonathan Papelbon J. Papelbon	1.85	58.1	2007	BOS	59	1	3	.250	0	84	0	0	37	30	12	12	5	15	4	53	0	224	0	12.96	2.31	5.60	0.77	37.5	6.7	0.77	.216	1.85	40	2.44	57	4.63	12.4