relief pitchers with lowest era 2005 to 2014 minimum 500 innings pitched

Between 2005 and 2014, Mariano Rivera had the lowest ERA by a relief pitcher when pitching at least 500 innings, with an ERA of 1.91.

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Data note: Earned Run Average, Innings Pitched: player game data complete from 1901
Data note: Data: Retrosheet

	NAME	ERA	IP	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	H/9
1	Mariano Rivera M. Rivera	1.91	555.1	529	35	29	.547	0	525	0	0	316	418	118	129	31	89	26	478	17	2,161	4	8.51	1.44	5.90	0.50	24.3	4.1	0.91	.260	2.09	6.77
2	Jonathan Papelbon J. Papelbon	2.37	611.1	590	35	29	.547	0	706	0	0	325	467	161	181	45	149	25	504	12	2,455	12	10.39	2.19	4.74	0.66	28.8	6.1	1.01	.276	2.66	6.88
3	Joe Nathan J. Nathan	2.48	578.0	582	37	22	.627	0	677	0	0	331	412	159	169	45	175	13	508	21	2,309	30	10.54	2.72	3.87	0.70	29.3	7.6	1.02	.262	2.63	6.42
4	Scott Downs S. Downs	2.68	504.0	569	26	26	.500	0	400	0	0	27	423	150	165	33	182	16	113	28	2,090	21	7.14	3.25	2.20	0.59	19.1	8.7	1.20	.267	2.95	7.55
5	Rafael Soriano R. Soriano	2.77	527.0	529	19	22	.463	0	534	0	0	205	397	162	169	50	165	12	327	18	2,120	11	9.12	2.82	3.24	0.85	25.2	7.8	1.07	.255	2.89	6.78
6	Huston Street H. Street	2.82	591.1	576	36	29	.554	0	591	0	0	275	457	185	199	58	150	8	451	30	2,343	14	8.99	2.28	3.94	0.88	25.2	6.4	1.03	.260	3.03	6.96
7	Francisco Rodriguez F. Rodriguez	2.82	659.2	666	34	37	.479	0	774	0	0	334	520	207	223	63	276	11	491	32	2,752	47	10.56	3.77	2.80	0.86	28.1	10.0	1.21	.281	3.04	7.09
8	J.J. Putz	2.86	500.0	515	37	30	.552	0	549	0	0	180	399	159	166	40	157	14	327	14	2,036	23	9.88	2.83	3.50	0.72	27.0	7.7	1.11	.281	2.99	7.18
9	Joaquin Benoit J. Benoit	2.91	562.0	514	31	18	.633	0	616	0	0	47	407	182	199	51	204	10	150	16	2,270	21	9.86	3.27	3.02	0.82	27.1	9.0	1.09	.256	3.19	6.52
10	Darren Oliver D. Oliver	2.96	504.2	459	31	19	.620	0	425	0	0	5	441	166	183	44	137	22	104	20	2,057	15	7.58	2.44	3.10	0.78	20.7	6.7	1.15	.278	3.26	7.86
11	Jonathan Broxton J. Broxton	3.07	539.1	542	35	30	.538	0	622	0	0	118	444	184	209	35	211	17	256	26	2,242	19	10.38	3.52	2.95	0.58	27.7	9.4	1.21	.301	3.49	7.41
12	Jesse Crain J. Crain	3.10	505.0	510	42	30	.583	0	426	0	0	4	432	174	199	42	194	17	113	26	2,112	13	7.59	3.46	2.20	0.75	20.2	9.2	1.24	.272	3.55	7.70
13	Rafael Betancourt R. Betancourt	3.17	541.2	534	29	25	.537	0	572	0	0	69	455	191	202	55	121	0	198	28	2,172	11	9.50	2.01	4.73	0.91	26.3	5.6	1.06	.281	3.36	7.56
14	Carlos Marmol C. Marmol	3.25	509.1	506	18	29	.383	0	698	0	0	117	324	184	195	37	340	47	259	20	2,207	32	12.33	6.01	2.05	0.65	31.6	15.4	1.30	.265	3.45	5.73
15	Jose Valverde J. Valverde	3.32	550.1	543	24	30	.444	0	583	0	0	270	443	203	222	56	221	23	467	25	2,311	18	9.53	3.61	2.64	0.92	25.2	9.6	1.21	.271	3.63	7.24
16	Jeremy Affeldt J. Affeldt	3.34	568.0	605	26	25	.510	0	467	0	0	11	504	211	242	36	246	28	120	32	2,430	42	7.40	3.90	1.90	0.57	19.2	10.1	1.32	.283	3.83	7.99
17	Matt Thornton M. Thornton	3.38	571.2	651	32	43	.427	0	580	0	0	23	509	215	234	46	209	18	142	33	2,403	25	9.13	3.29	2.78	0.72	24.1	8.7	1.26	.299	3.68	8.01
18	Fernando Rodney F. Rodney	3.42	590.0	585	28	44	.389	0	584	0	0	217	493	224	248	40	285	33	387	24	2,546	35	8.91	4.35	2.05	0.61	22.9	11.2	1.32	.282	3.78	7.52
19	Matt Guerrier M. Guerrier	3.44	600.0	545	27	34	.443	0	397	0	0	6	554	229	247	63	200	18	118	29	2,518	29	5.96	3.00	1.99	0.95	15.8	7.9	1.26	.267	3.71	8.31
20	Francisco Cordero F. Cordero	3.47	526.1	542	34	36	.486	0	517	0	0	255	479	203	219	44	224	18	432	15	2,250	23	8.84	3.83	2.31	0.75	23.0	10.0	1.34	.301	3.74	8.19
21	LaTroy Hawkins L. Hawkins	3.49	528.2	557	23	32	.418	0	348	0	0	55	535	205	223	44	145	5	190	20	2,214	17	5.92	2.47	2.40	0.75	15.7	6.5	1.29	.294	3.80	9.11
22	Heath Bell H. Bell	3.50	604.1	573	38	30	.559	0	610	0	0	168	562	235	249	43	208	16	290	21	2,541	27	9.08	3.10	2.93	0.64	24.0	8.2	1.27	.312	3.71	8.37
23	Jason Frasor J. Frasor	3.53	550.1	584	30	29	.508	0	539	0	0	19	477	216	231	51	229	21	158	26	2,324	32	8.81	3.75	2.35	0.83	23.2	9.9	1.28	.287	3.78	7.80
24	Brandon League B. League	3.69	527.1	495	26	35	.426	0	373	0	0	74	517	216	251	41	184	27	216	28	2,246	47	6.37	3.14	2.03	0.70	16.6	8.2	1.33	.294	4.28	8.82
25	Chad Qualls C. Qualls	3.77	675.2	696	42	42	.500	0	521	0	0	69	679	283	312	66	180	26	230	39	2,830	24	6.94	2.40	2.89	0.88	18.4	6.4	1.27	.301	4.16	9.04

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Between 2005 and 2014, Mariano Rivera had the lowest ERA by a relief pitcher when pitching at least 500 innings, with an ERA of 1.91.

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