Hoyt Wilhelm has pitched the most career innings by a relief pitcher, with 1872.1 innings.

	NAME	IP	G	W	L	W%	GS	ERA	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	Hoyt Wilhelm H. Wilhelm	1872.1	1,018	124	103	.546	0	2.49	1,363	0	0	228	1,436	518	636	125	661	51	651	58	7,619	83	6.55	3.18	2.06	0.60	17.9	8.7	1.12	.242	3.06	6.90
2	Lindy McDaniel L. McDaniel	1694.2	913	119	88	.575	0	3.14	1,165	0	0	174	1,590	591	682	122	486	11	577	120	7,019	92	6.19	2.58	2.40	0.65	16.6	6.9	1.23	.280	3.62	8.44
3	Rich Gossage R. Gossage	1556.2	965	115	85	.575	0	2.77	1,340	0	0	310	1,235	479	537	98	628	38	681	87	6,408	56	7.75	3.63	2.13	0.57	20.9	9.8	1.20	.264	3.10	7.14
4	Rollie Fingers R. Fingers	1505.2	907	107	101	.514	0	2.73	1,183	0	0	341	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
5	Gene Garber G. Garber	1452.2	922	94	108	.465	0	3.30	913	0	0	218	1,404	533	624	113	424	37	609	151	6,083	29	5.66	2.63	2.15	0.70	15.0	7.0	1.26	.281	3.87	8.70
6	Kent Tekulve K. Tekulve	1436.2	1,050	94	90	.511	0	2.85	779	0	0	184	1,305	455	526	63	491	17	638	179	6,001	23	4.88	3.08	1.59	0.39	13.0	8.2	1.25	.267	3.30	8.18
7	Sparky Lyle S. Lyle	1390.1	899	99	76	.566	0	2.88	873	0	0	238	1,292	445	519	84	481	14	634	81	5,796	68	5.65	3.11	1.81	0.54	15.1	8.3	1.28	.278	3.36	8.36
8	Tug McGraw T. McGraw	1301.1	785	89	69	.563	0	2.86	974	0	0	180	1,104	414	467	74	494	20	541	123	5,391	51	6.74	3.42	1.97	0.51	18.1	9.2	1.23	.269	3.23	7.64
9	Don McMahon D. McMahon	1297.0	872	90	66	.577	0	2.94	992	0	0	152	1,040	424	474	102	576	34	505	82	5,446	74	6.88	4.00	1.72	0.71	18.2	10.6	1.25	.251	3.29	7.22
10	Jesse Orosco J. Orosco	1277.0	1,248	87	78	.527	0	3.12	1,169	0	0	144	1,035	442	499	112	568	34	501	85	5,374	40	8.24	4.00	2.06	0.79	21.8	10.6	1.26	.264	3.52	7.29
11	Mike Marshall M. Marshall	1259.1	700	92	98	.484	0	2.96	813	0	0	188	1,143	414	469	68	461	28	549	48	5,276	63	5.81	3.29	1.76	0.49	15.4	8.7	1.27	.275	3.35	8.17
12	Lee Smith L. Smith	1252.1	1,016	71	87	.449	0	2.98	1,225	0	0	478	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
13	Tom Burgmeier T. Burgmeier	1248.2	742	79	53	.598	0	3.19	579	0	0	102	1,214	443	510	92	381	32	370	54	5,222	23	4.17	2.75	1.52	0.66	11.1	7.3	1.28	.271	3.68	8.75
14	John Franco J. Franco	1245.2	1,119	90	87	.508	0	2.89	975	0	0	424	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
15	Mariano Rivera M. Rivera	1233.2	1,105	79	57	.581	0	2.06	1,135	0	0	652	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
16	Roy Face R. Face	1212.0	821	96	82	.539	0	3.27	793	0	0	191	1,170	441	494	117	314	12	574	101	5,001	30	5.89	2.33	2.53	0.87	15.9	6.3	1.22	.280	3.67	8.69
17	Clay Carroll C. Carroll	1204.2	703	88	66	.571	0	2.82	613	0	0	143	1,141	377	438	57	397	35	373	105	5,047	38	4.58	2.97	1.54	0.43	12.1	7.9	1.28	.275	3.27	8.52
18	Eddie Fisher E. Fisher	1186.1	627	62	51	.549	0	3.12	643	0	0	82	1,019	411	470	105	346	21	344	38	4,837	47	4.88	2.62	1.86	0.80	13.3	7.2	1.15	.246	3.57	7.73
19	Mike Timlin M. Timlin	1185.1	1,054	74	71	.510	0	3.64	859	0	0	141	1,148	479	526	118	369	47	467	72	4,999	31	6.52	2.80	2.33	0.90	17.2	7.4	1.28	.286	3.99	8.72
20	Bill Campbell B. Campbell	1177.1	691	80	65	.552	0	3.44	829	0	0	126	1,077	450	510	76	472	18	455	99	5,001	44	6.34	3.61	1.76	0.58	16.6	9.4	1.32	.278	3.90	8.23
21	Ron Perranoski R. Perranoski	1170.2	736	79	74	.516	0	2.78	685	0	0	178	1,091	362	440	48	467	24	458	121	5,002	28	5.27	3.59	1.47	0.37	13.7	9.3	1.33	.276	3.38	8.39
22	Bob Stanley B. Stanley	1159.0	552	85	61	.582	0	3.28	516	0	0	132	1,211	422	498	64	334	28	377	77	4,879	16	4.01	2.59	1.54	0.50	10.6	6.8	1.33	.291	3.87	9.40
23	Michael Jackson M. Jackson	1154.2	998	61	63	.492	0	3.33	983	0	0	142	948	427	467	119	440	56	422	80	4,810	34	7.66	3.43	2.23	0.93	20.4	9.1	1.20	.258	3.64	7.39
24	Jeff Reardon J. Reardon	1132.1	880	73	77	.487	0	3.16	877	0	0	367	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
25	Mike Stanton M. Stanton	1110.0	1,177	68	63	.519	0	3.93	892	0	0	84	1,084	485	523	93	419	33	363	76	4,748	35	7.23	3.40	2.13	0.75	18.8	8.8	1.35	.299	4.24	8.79