Mariano Rivera has the most career saves by a relief pitcher, with 652 saves.

Interpreted as:

What relief pitcher has the most regular-season saves?

	NAME	SV	G	W	L	W%	GS	ERA	SO	CG	SHO	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	Mariano Rivera M. Rivera	652	1,105	79	57	.581	0	2.06	1,135	0	0	1233.2	934	282	305	63	266	44	952	41	4,870	13	8.28	1.94	4.27	0.46	23.3	5.5	0.97	.259	2.23	6.81
2	Trevor Hoffman T. Hoffman	601	1,035	61	75	.449	0	2.87	1,133	0	0	1089.1	846	347	378	100	307	9	856	58	4,388	49	9.36	2.54	3.69	0.83	25.8	7.0	1.06	.263	3.12	6.99
3	Lee Smith L. Smith	478	1,016	71	87	.449	0	2.98	1,225	0	0	1252.1	1,095	415	456	87	474	9	802	100	5,230	46	8.80	3.41	2.58	0.63	23.4	9.1	1.25	.293	3.28	7.87
4	Kenley Jansen K. Jansen	460	897	50	38	.568	0	2.62	1,240	0	0	891.0	594	259	277	85	272	31	674	19	3,543	21	12.53	2.75	4.56	0.86	35.0	7.7	0.97	.266	2.80	6.00
5	Craig Kimbrel C. Kimbrel	440	838	56	47	.544	0	2.59	1,266	0	0	810.2	483	233	259	73	340	40	651	11	3,260	70	14.06	3.77	3.72	0.81	38.8	10.4	1.02	.266	2.88	5.36
6	Francisco Rodriguez F. Rodriguez	437	948	52	53	.495	0	2.86	1,142	0	0	976.0	738	310	336	98	389	17	677	42	4,011	68	10.53	3.59	2.94	0.90	28.5	9.7	1.15	.271	3.10	6.81
7	John Franco J. Franco	424	1,119	90	87	.508	0	2.89	975	0	0	1245.2	1,166	400	466	81	495	22	774	78	5,312	54	7.04	3.58	1.97	0.59	18.4	9.3	1.33	.290	3.37	8.42
8	Billy Wagner B. Wagner	422	853	47	40	.540	0	2.31	1,196	0	0	903.0	601	232	262	82	300	33	703	26	3,600	43	11.92	2.99	3.99	0.82	33.2	8.3	1.00	.261	2.61	5.99
9	Dennis Eckersley D. Eckersley	390	710	48	41	.539	0	2.85	792	0	0	807.1	680	256	278	79	126	19	577	29	3,204	4	8.83	1.40	6.29	0.88	24.7	3.9	1.00	.275	3.10	7.58
10	Joe Nathan J. Nathan	377	758	52	29	.642	0	2.50	881	0	0	761.0	540	211	222	60	248	18	587	27	3,048	41	10.42	2.93	3.55	0.71	28.9	8.1	1.04	.261	2.63	6.39
11	Jonathan Papelbon J. Papelbon	368	686	41	36	.532	0	2.45	793	0	0	709.2	557	193	221	55	175	32	585	17	2,867	13	10.06	2.22	4.53	0.70	27.7	6.1	1.03	.277	2.80	7.06
12	Jeff Reardon J. Reardon	367	880	73	77	.487	0	3.16	877	0	0	1132.1	1,000	397	426	109	358	27	695	65	4,720	20	6.97	2.85	2.45	0.87	18.6	7.6	1.20	.266	3.39	7.95
13	Troy Percival T. Percival	358	702	35	43	.449	0	3.18	779	0	0	707.2	478	250	271	85	306	27	546	25	2,911	32	9.91	3.89	2.55	1.08	26.8	10.5	1.11	.229	3.45	6.08
14	Aroldis Chapman A. Chapman	347	827	58	46	.558	0	2.59	1,285	0	0	788.1	463	227	252	53	402	33	538	7	3,223	82	14.67	4.59	3.20	0.61	39.9	12.5	1.10	.283	2.88	5.29
15	Randy Myers R. Myers	347	716	42	57	.424	0	3.17	829	0	0	814.1	696	287	303	64	353	11	548	43	3,433	31	9.16	3.90	2.35	0.71	24.1	10.3	1.29	.290	3.35	7.69
16	Rollie Fingers R. Fingers	341	907	107	101	.514	0	2.73	1,183	0	0	1505.2	1,276	456	502	97	429	29	709	105	6,104	37	7.07	2.56	2.76	0.58	19.4	7.0	1.13	.270	3.00	7.63
17	John Wetteland J. Wetteland	330	601	46	36	.561	0	2.62	730	0	0	683.0	537	199	230	63	221	12	523	27	2,793	28	9.62	2.91	3.30	0.83	26.1	7.9	1.11	.268	3.03	7.08
18	Francisco Cordero F. Cordero	329	800	47	53	.470	0	3.38	796	0	0	824.2	751	310	342	64	375	27	575	30	3,551	37	8.69	4.09	2.12	0.70	22.4	10.6	1.37	.300	3.73	8.20
19	Fernando Rodney F. Rodney	327	951	48	71	.403	0	3.80	943	0	0	933.0	817	394	433	73	464	52	590	38	4,064	65	9.10	4.48	2.03	0.70	23.2	11.4	1.37	.294	4.18	7.88
20	Roberto Hernandez R. Hernandez	326	1,007	66	71	.482	0	3.42	940	0	0	1060.0	992	403	465	95	457	35	667	53	4,583	49	7.98	3.88	2.06	0.81	20.5	10.0	1.37	.294	3.95	8.42
21	Huston Street H. Street	324	668	42	34	.553	0	2.95	665	0	0	680.0	542	223	237	70	183	8	525	37	2,718	20	8.80	2.42	3.63	0.93	24.5	6.7	1.07	.263	3.14	7.17
22	Jose Mesa J. Mesa	321	927	53	69	.434	0	3.95	753	0	0	984.0	1,007	432	475	96	419	40	633	51	4,321	58	6.89	3.83	1.80	0.88	17.4	9.7	1.45	.302	4.34	9.21
23	Todd Jones T. Jones	319	981	58	62	.483	0	3.95	866	0	0	1067.2	1,063	468	513	93	443	38	619	62	4,629	43	7.30	3.73	1.95	0.78	18.7	9.6	1.41	.304	4.32	8.96
24	Rick Aguilera R. Aguilera	318	643	46	52	.469	0	3.19	651	0	0	740.1	648	262	293	79	216	20	557	37	3,053	28	7.91	2.63	3.01	0.96	21.3	7.1	1.17	.273	3.56	7.88
25	Robb Nen R. Nen	314	639	43	41	.512	0	2.94	779	0	0	697.0	593	228	255	50	244	7	549	41	2,903	36	10.06	3.15	3.19	0.65	26.8	8.4	1.20	.298	3.29	7.66