most wins in a single season by a relief pitcher since 1990

Since 1990, Ryan Yarbrough has won the most games by a relief pitcher in a season, with 14 wins in his rookie season in 2018.

	NAME	W	SEASON	TM	L	W%	G	GS	ERA	SO	CG	SHO	SV	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	Ryan Yarbrough R. Yarbrough	14	2018	TBR	4	.778	32	0	3.72	106	0	0	0	118.2	110	49	52	15	42	6	3	5	505	0	8.04	3.19	2.52	1.14	21.0	8.3	1.28	.283	3.94	8.34
2	Adrian Morejon A. Morejon	13	2025	SDP	6	.684	75	0	2.08	70	0	0	3	73.2	49	17	23	2	17	0	9	3	286	2	8.55	2.08	4.12	0.24	24.5	5.9	0.90	.239	2.81	5.99
3	Colin Poche C. Poche	12	2023	TBR	3	.800	66	0	2.23	61	0	0	1	60.2	42	15	17	4	24	1	6	1	246	3	9.05	3.56	2.54	0.59	24.8	9.8	1.09	.244	2.52	6.23
4	Brent Suter B. Suter	12	2021	MIL	4	.750	60	0	2.79	67	0	0	1	71.0	68	22	31	9	23	1	9	3	301	1	8.49	2.92	2.91	1.14	22.3	7.6	1.28	.294	3.93	8.62
5	Jesse Crain J. Crain	12	2005	MIN	5	.706	75	0	2.71	25	0	0	1	79.2	61	24	28	6	29	5	17	7	326	2	2.82	3.28	0.86	0.68	7.7	8.9	1.13	.211	3.16	6.89
6	Joe Nathan J. Nathan	12	2003	SFG	4	.750	78	0	2.96	83	0	0	0	79.0	51	26	26	7	33	3	9	3	316	4	9.46	3.76	2.52	0.80	26.3	10.4	1.06	.232	2.96	5.81
7	Scott Williamson S. Williamson	12	1999	CIN	7	.632	62	0	2.41	107	0	0	19	93.1	54	25	29	8	43	1	40	6	366	13	10.32	4.15	2.49	0.77	29.2	11.7	1.04	.222	2.80	5.21
8	Mitch Williams M. Williams	12	1991	PHI	5	.706	69	0	2.34	84	0	0	30	88.1	56	23	24	4	62	8	60	5	386	4	8.56	6.32	1.35	0.41	21.8	16.1	1.34	.228	2.45	5.71
9	John Gant J. Gant	11	2019	STL	1	.917	64	0	3.66	60	0	0	3	66.1	51	27	29	4	34	0	13	1	269	1	8.14	4.61	1.76	0.54	22.3	12.6	1.28	.275	3.93	6.92
10	Tyler Clippard T. Clippard	11	2010	WSH	8	.579	78	0	3.07	112	0	0	1	91.0	69	31	33	8	41	2	18	4	378	1	11.08	4.05	2.73	0.79	29.6	10.8	1.21	.284	3.26	6.82
11	Todd Jones T. Jones	11	2004	TOT	5	.688	78	0	4.15	59	0	0	2	82.1	84	38	39	7	33	6	16	5	358	2	6.45	3.61	1.79	0.77	16.5	9.2	1.42	.304	4.26	9.18
12	Juan Rincon J. Rincon	11	2004	MIN	6	.647	77	0	2.63	106	0	0	2	82.0	52	24	27	5	32	2	18	1	327	2	11.63	3.51	3.31	0.55	32.4	9.8	1.02	.258	2.96	5.71
13	Billy Koch B. Koch	11	2002	OAK	4	.733	84	0	3.27	93	0	0	44	93.2	73	34	38	7	46	4	79	6	398	5	8.94	4.42	2.02	0.67	23.4	11.6	1.27	.266	3.65	7.01
14	Paul Quantrill P. Quantrill	11	2001	TOR	2	.846	80	0	3.04	58	0	0	2	83.0	86	28	29	6	12	6	20	7	341	0	6.29	1.30	4.83	0.65	17.0	3.5	1.18	.309	3.14	9.33
15	Matt Herges M. Herges	11	2000	LAD	0	1.000	55	0	2.57	64	0	0	1	87.2	76	25	28	6	28	4	17	4	359	3	6.57	2.87	2.29	0.62	17.8	7.8	1.19	.272	2.87	7.80
16	Gabe White G. White	11	2000	TOT	2	.846	68	0	2.36	84	0	0	5	84.0	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	6.86
17	Doug Jones D. Jones	11	1992	HOU	8	.579	80	0	1.85	93	0	0	36	111.2	96	23	29	5	17	5	70	5	440	2	7.50	1.37	5.47	0.40	21.1	3.9	1.01	.284	2.34	7.74
18	Lee Guetterman L. Guetterman	11	1990	NYY	7	.611	64	0	3.39	48	0	0	2	93.0	80	35	37	6	26	0	21	7	376	1	4.65	2.52	1.85	0.58	12.8	6.9	1.14	.250	3.58	7.74
19	Bill Sampen B. Sampen	11	1990	MON	6	.647	55	0	2.59	56	0	0	2	76.1	74	22	24	5	30	2	26	6	331	4	6.60	3.54	1.87	0.59	16.9	9.1	1.36	.290	2.83	8.72
20	Barry Jones B. Jones	11	1990	CWS	4	.733	65	0	2.31	45	0	0	1	74.0	62	19	20	2	33	1	9	7	310	0	5.47	4.01	1.36	0.24	14.5	10.6	1.28	.262	2.43	7.54
21	Edwin Uceta E. Uceta	10	2025	TBR	3	.769	70	0	3.79	103	0	0	1	76.0	62	32	33	11	27	8	11	3	321	0	12.20	3.20	3.81	1.30	32.1	8.4	1.17	.297	3.91	7.34
22	Héctor Neris H. Neris	10	2024	TOT	5	.667	62	0	4.10	64	0	0	18	59.1	55	27	31	8	28	2	36	2	260	2	9.71	4.25	2.29	1.21	24.6	10.8	1.40	.297	4.70	8.34
23	Ryan Walker R. Walker	10	2024	SFG	4	.714	75	0	1.94	97	0	0	10	79.0	49	17	19	5	18	8	22	1	303	2	11.05	2.05	5.39	0.57	32.0	5.9	0.85	.251	2.16	5.58
24	Mike Baumann M. Baumann	10	2023	BAL	1	.909	60	0	3.76	61	0	0	0	64.2	52	27	29	7	33	2	15	2	273	7	8.49	4.59	1.85	0.97	22.3	12.1	1.31	.265	4.04	7.24
25	Adam Cimber A. Cimber	10	2022	TOR	6	.625	77	0	2.80	58	0	0	4	70.2	66	22	28	6	13	8	15	1	293	1	7.39	1.66	4.46	0.76	19.8	4.4	1.12	.288	3.57	8.41