all-time single season era- leaders, minimum 80 ip, maximum 10 saves, maximum 5 starts

Dellin Betances has the best ERA- with at most 10 saves, with 80.0+ innings pitched and 5 or fewer starts in a season, with an ERA- of 36 in his rookie season in 2014.

	NAME	ERA-	IP	SV	GS	SEASON	TM	G	W	L	W%	ERA	SO	CG	SHO	H	ER	R	HR	BB	HBP	GF	IBB	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	FIP	FIP-	H/9	PRAA
1	Dellin Betances D. Betances	36	90.0	1	0	2014	NYY	70	5	0	1.000	1.40	135	0	0	46	14	15	4	24	4	8	1	341	2	13.50	2.40	5.63	0.40	39.6	7.0	0.78	.241	1.50	1.64	42	4.60	22.2
2	Dellin Betances D. Betances	37	84.0	9	0	2015	NYY	74	6	4	.600	1.50	131	0	0	45	14	17	6	40	3	17	2	332	9	14.04	4.29	3.28	0.64	39.5	12.0	1.01	.257	1.82	2.47	59	4.82	15.6
3	Felix Rodriguez F. Rodriguez	40	80.1	0	0	2001	SFG	80	9	1	.900	1.68	91	0	0	53	15	16	5	27	1	13	2	314	1	10.20	3.02	3.37	0.56	29.0	8.6	1.00	.253	1.79	2.63	63	5.94	14.3
4	Rheal Cormier R. Cormier	41	84.2	1	0	2003	PHI	65	8	0	1.000	1.70	67	0	0	54	16	18	4	25	1	21	2	327	0	7.12	2.66	2.68	0.43	20.5	7.6	0.93	.217	1.91	2.98	70	5.74	12.1
5	Mark Eichhorn M. Eichhorn	41	157.0	10	0	1986	TOR	69	14	6	.700	1.72	166	0	0	105	30	32	8	45	7	38	14	612	2	9.52	2.58	3.69	0.46	27.1	7.4	0.96	.251	1.83	2.30	56	6.02	31.8
6	Peter Moylan P. Moylan	41	90.0	1	0	2007	ATL	80	5	3	.625	1.80	63	0	0	65	18	27	6	31	7	16	12	359	2	6.30	3.10	2.03	0.60	17.5	8.6	1.07	.234	2.70	3.96	89	6.50	4.8
7	Marv Grissom M. Grissom	41	80.2	7	2	1956	NYG	43	1	1	.500	1.56	49	0	0	71	14	15	3	16	1	20	3	323	2	5.47	1.79	3.06	0.33	15.2	5.0	1.08	.268	1.67	2.27	58	7.92	14.7
8	J.C. Romero	42	81.0	1	0	2002	MIN	81	9	2	.818	1.89	76	0	0	62	17	17	3	36	4	15	4	332	9	8.44	4.00	2.11	0.33	22.9	10.8	1.21	.277	1.89	3.04	71	6.89	11.3
9	Mel Rojas M. Rojas	42	100.2	10	0	1992	MON	68	7	1	.875	1.43	70	0	0	71	16	17	2	34	2	26	8	399	2	6.26	3.04	2.06	0.18	17.5	8.5	1.04	.237	1.52	2.72	79	6.35	8.2
10	Steve Reed S. Reed	42	84.0	3	0	1995	COL	71	5	2	.714	2.14	79	0	0	61	20	24	8	21	1	15	3	327	0	8.46	2.25	3.76	0.86	24.2	6.4	0.98	.243	2.57	3.24	69	6.54	12.5
11	Gabe White G. White	42	84.0	5	0	2000	TOT	68	11	2	.846	2.36	84	0	0	64	22	23	6	15	3	17	2	329	1	9.00	1.61	5.60	0.64	25.5	4.6	0.94	.262	2.46	2.70	52	6.86	21.5
12	Paul Quantrill P. Quantrill	43	88.0	5	0	1997	TOR	77	6	7	.462	1.94	56	0	0	103	19	25	5	17	1	29	3	373	1	5.73	1.74	3.29	0.51	15.0	4.6	1.36	.333	2.56	3.18	71	10.53	12.8
13	Joel Zumaya J. Zumaya	43	83.1	1	0	2006	DET	62	6	3	.667	1.94	97	0	0	56	18	20	6	42	2	12	2	350	4	10.48	4.54	2.31	0.65	27.7	12.0	1.18	.246	2.16	3.33	74	6.05	11
14	Mariano Rivera M. Rivera	43	107.2	5	0	1996	NYY	61	8	3	.727	2.09	130	0	0	73	25	25	1	34	2	14	3	425	1	10.87	2.84	3.82	0.08	30.6	8.0	0.99	.279	2.09	1.87	39	6.10	35.8
15	Octavio Dotel O. Dotel	43	97.1	6	0	2002	HOU	83	6	4	.600	1.85	118	0	0	58	20	21	7	27	4	22	2	376	2	10.91	2.50	4.37	0.65	31.4	7.2	0.87	.232	1.94	2.42	57	5.36	19.5
16	Fred Beene F. Beene	45	91.0	1	4	1973	NYY	19	6	0	1.000	1.68	49	0	0	67	17	21	5	27	1	11	5	353	3	4.85	2.67	1.81	0.49	13.9	7.6	1.03	.229	2.08	3.12	85	6.63	5.8
17	Keith Foulke K. Foulke	46	105.1	9	0	1999	CWS	67	3	3	.500	2.22	123	0	0	72	26	28	11	21	3	31	4	411	1	10.51	1.79	5.86	0.94	29.9	5.1	0.88	.241	2.39	2.83	58	6.15	23.3
18	Larry Andersen L. Andersen	46	87.2	3	0	1989	HOU	60	4	4	.500	1.54	85	0	0	63	15	19	2	24	0	21	4	351	2	8.73	2.46	3.54	0.21	24.2	6.8	0.99	.254	1.95	1.93	57	6.47	14.7
19	Todd Frohwirth T. Frohwirth	47	96.1	3	0	1991	BAL	51	7	3	.700	1.87	77	0	0	64	20	24	2	29	1	10	3	372	0	7.19	2.71	2.66	0.19	20.7	7.8	0.97	.236	2.24	2.46	61	5.98	17
20	LaTroy Hawkins L. Hawkins	47	80.1	0	0	2002	MIN	65	6	0	1.000	2.13	63	0	0	63	19	23	5	15	0	15	1	310	5	7.06	1.68	4.20	0.56	20.3	4.8	0.97	.256	2.58	2.75	64	7.06	13.8
21	Jeff Zimmerman J. Zimmerman	47	87.2	3	0	1999	TEX	65	9	3	.750	2.36	67	0	0	50	23	24	9	23	2	14	1	336	2	6.88	2.36	2.91	0.92	19.9	6.8	0.83	.174	2.46	3.78	77	5.13	10.6
22	Jumbo Brown J. Brown	48	90.0	5	0	1938	NYG	43	5	3	.625	1.80	42	0	0	65	18	26	5	28	1	32		357	3	4.20	2.80	1.50	0.50	11.8	7.8	1.03	.214	2.60	3.68	93	6.50	2.9
23	Ryan Walker R. Walker	48	80.0	10	1	2024	SFG	76	10	4	.714	1.91	99	0	0	50	17	19	5	18	9	22	1	308	2	11.14	2.03	5.50	0.56	32.1	5.8	0.85	.254	2.14	2.51	64	5.63	12.7
24	Bob Miller B. Miller	48	98.2	10	0	1971	TOT	56	8	5	.615	1.64	51	0	0	83	18	24	1	40	1	37	11	409	1	4.65	3.65	1.27	0.09	12.5	9.8	1.25	.259	2.19	2.79	85	7.57	5.3
25	Tyler Clippard T. Clippard	48	88.1	0	0	2011	WSH	72	3	0	1.000	1.83	104	0	0	48	18	18	11	26	0	8	2	329	1	10.60	2.65	4.00	1.12	31.6	7.9	0.84	.197	1.83	3.17	82	4.89	6.7