Roberto Osuna has the most career saves by a pitcher younger than 25, with 154 saves.

Interpreted as:

most regular-season saves before turning 25 years old by a player

	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	Roberto Osuna R. Osuna	154	310	14	18	.438	0	2.75	345	0	0	310.2	227	95	100	28	55	13	245	6	1,211	17	9.99	1.59	6.27	0.81	28.5	4.5	0.91	.258	2.90	6.58
2	Edwin Díaz E. Díaz	109	188	4	14	.222	0	2.64	301	0	0	191.0	130	56	61	20	64	12	140	4	775	12	14.18	3.02	4.70	0.94	38.8	8.3	1.02	.291	2.87	6.13
3	Francisco Rodriguez F. Rodriguez	106	268	16	12	.571	0	2.28	420	0	0	316.0	201	80	87	27	130	5	172	15	1,265	30	11.96	3.70	3.23	0.77	33.2	10.3	1.05	.255	2.48	5.72
4	Craig Kimbrel C. Kimbrel	104	183	12	5	.706	0	1.55	312	0	0	179.2	98	31	33	9	66	5	145	3	700	13	15.63	3.31	4.73	0.45	44.6	9.4	0.91	.289	1.65	4.91
5	Gregg Olson G. Olson	95	210	16	14	.533	0	2.43	245	0	0	244.0	198	66	69	6	116	5	176	19	1,031	22	9.04	4.28	2.11	0.22	23.8	11.3	1.29	.291	2.55	7.30
6	Huston Street H. Street	94	227	16	11	.593	0	2.85	248	0	0	246.2	193	78	86	18	67	5	170	13	990	7	9.05	2.44	3.70	0.66	25.1	6.8	1.05	.268	3.14	7.04
7	Chad Cordero C. Cordero	91	223	17	11	.607	0	2.61	225	0	0	241.1	186	70	81	31	85	6	165	12	1,004	6	8.39	3.17	2.65	1.16	22.4	8.5	1.12	.236	3.02	6.94
8	Byung-Hyun Kim B. Kim	86	292	29	27	.518	13	3.24	449	0	0	402.1	298	145	161	38	169	40	185	15	1,693	15	10.04	3.78	2.66	0.85	26.5	10.0	1.16	.261	3.60	6.67
9	Terry Forster T. Forster	75	263	26	42	.382	33	3.36	479	5	0	605.0	571	226	253	25	258	13	158	23	2,586	31	7.13	3.84	1.86	0.37	18.5	10.0	1.37	.301	3.76	8.49
10	Neftali Feliz N. Feliz	74	162	10	7	.588	7	2.67	201	1	0	205.1	126	61	64	16	79	10	118	2	813	7	8.81	3.46	2.54	0.70	24.7	9.7	1.00	.217	2.81	5.52
11	Addison Reed A. Reed	69	136	8	6	.571	0	4.17	138	0	0	133.2	123	62	64	13	42	4	105	5	566	2	9.29	2.83	3.29	0.88	24.4	7.4	1.23	.298	4.31	8.28
12	Mitch Williams M. Williams	68	308	22	23	.489	1	3.49	347	0	0	356.1	251	138	151	27	272	32	182	22	1,565	20	8.76	6.87	1.28	0.68	22.2	17.4	1.47	.253	3.81	6.34
13	Emmanuel Clase E. Clase	67	169	9	12	.429	1	1.47	172	0	0	165.2	114	27	44	7	32	2	125	5	644	8	9.34	1.74	5.38	0.38	26.7	5.0	0.88	.248	2.39	6.19
14	Neil Allen N. Allen	67	202	23	33	.411	5	3.38	253	0	0	327.2	316	123	137	20	143	1	151	35	1,403	15	6.95	3.93	1.77	0.55	18.0	10.2	1.40	.300	3.76	8.68
15	Joakim Soria J. Soria	66	133	5	6	.455	0	2.05	151	0	0	145.0	93	33	36	8	42	7	103	4	569	5	9.37	2.61	3.60	0.50	26.5	7.4	0.93	.235	2.23	5.77
16	Trevor Rosenthal T. Rosenthal	61	186	5	12	.294	0	2.64	245	0	0	190.2	149	56	59	9	77	11	97	7	797	8	11.56	3.63	3.18	0.42	30.7	9.7	1.19	.308	2.78	7.03
17	Jorge Julio J. Julio	61	149	6	14	.300	0	3.22	129	0	0	151.0	140	54	71	17	70	5	120	7	661	9	7.69	4.17	1.84	1.01	19.5	10.6	1.39	.280	4.23	8.34
18	Ugueth Urbina U. Urbina	61	167	23	18	.561	21	3.32	301	0	0	271.0	217	100	111	35	120	2	111	9	1,141	10	10.00	3.99	2.51	1.16	26.4	10.5	1.24	.266	3.69	7.21
19	Billy McCool B. McCool	54	257	31	37	.456	20	3.41	449	0	0	490.1	425	186	214	31	246	17	149	36	2,118	32	8.24	4.52	1.83	0.57	21.2	11.6	1.37	.287	3.93	7.80
20	Drew Storen D. Storen	49	139	11	7	.611	0	3.05	132	0	0	138.2	111	47	50	11	48	6	78	7	571	5	8.57	3.12	2.75	0.71	23.1	8.4	1.15	.267	3.25	7.20
21	Rod Beck R. Beck	49	144	6	5	.545	0	2.22	186	0	0	194.2	149	48	51	12	34	3	97	6	758	7	8.60	1.57	5.47	0.55	24.5	4.5	0.94	.262	2.36	6.89
22	Lindy McDaniel L. McDaniel	43	226	53	38	.582	61	3.70	380	15	2	683.1	707	281	322	60	198	7	113	26	2,884	36	5.00	2.61	1.92	0.79	13.2	6.9	1.32	.289	4.24	9.31
23	Bobby Thigpen B. Thigpen	42	115	14	10	.583	0	2.69	104	0	0	180.2	170	54	61	14	57	6	91	8	757	4	5.18	2.84	1.82	0.70	13.7	7.5	1.26	.271	3.04	8.47
24	Bruce Sutter B. Sutter	41	114	13	6	.684	0	1.94	202	0	0	190.2	132	41	48	9	49	1	76	15	743	9	9.53	2.31	4.12	0.42	27.2	6.6	0.95	.255	2.27	6.23
25	John Rocker J. Rocker	40	121	5	8	.385	0	2.37	146	0	0	110.1	69	29	34	9	59	4	77	8	457	13	11.91	4.81	2.47	0.73	31.9	12.9	1.16	.251	2.77	5.63