lowest whip in a season by a left hand relief pitcher with at least 20 ip

Don Mossi has the lowest WHIP by a left-handed relief pitcher with 20.0+ innings pitched in a season, with a WHIP of 0.48 in 1963.

	NAME	WHIP	IP	SEASON	TM	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%	BABIP	RA	H/9
1	Don Mossi D. Mossi	0.48	25.0	1963	DET	8	2	0	1.000	0	0.72	12	0	0	2	12	2	3	2	0	0	5	0	85	0	4.32	0.00		0.72	14.1	0.0	.141	1.08	4.32
2	Sean Guenther S. Guenther	0.52	21.0	2024	DET	17	3	0	1.000	0	0.86	12	0	0	0	9	2	2	0	2	2	4	0	73	0	5.14	0.86	6.00	0.00	16.4	2.7	.158	0.86	3.86
3	Dutch Leonard D. Leonard	0.54	26.0	1914	BSA	11	4	0	1.000	0	0.35	28	0	0	3	5	1	2	0	9	2	9		93	1	9.69	3.12	3.11	0.00	30.1	9.7	.093	0.69	1.73
4	Steven Okert S. Okert	0.55	25.2	2025	HOU	22	1	1	.500	0	1.75	30	0	0	1	11	5	5	1	3	2	3	0	93	0	10.52	1.05	10.00	0.35	32.3	3.2	.175	1.75	3.86
5	Steve Howe S. Howe	0.55	22.0	1992	NYY	20	3	0	1.000	0	2.45	12	0	0	6	9	6	7	1	3	0	10	1	79	1	4.91	1.23	4.00	0.41	15.2	3.8	.127	2.86	3.68
6	Sean Doolittle S. Doolittle	0.60	45.0	2018	WSH	43	3	3	.500	0	1.60	60	0	0	25	21	8	8	3	6	2	35	1	163	1	12.00	1.20	10.00	0.60	36.8	3.7	.196	1.60	4.20
7	Valerio De Los Santos V. De Los Santos	0.60	21.2	1998	MIL	13	0	0		0	2.91	18	0	0	0	11	7	7	4	2	0	3	0	75	1	7.48	0.83	9.00	1.66	24.0	2.7	.137	2.91	4.57
8	Karl Spooner K. Spooner	0.62	32.1	1955	BKN	15	5	1	.833	0	1.11	30	0	0	2	12	4	4	0	8	3	10	1	117	0	8.35	2.23	3.75	0.00	25.6	6.8	.158	1.11	3.34
9	Charlie Furbush C. Furbush	0.65	21.2	2015	SEA	33	1	1	.500	0	2.08	17	0	0	0	9	5	6	2	5	2	4	2	82	5	7.06	2.08	3.40	0.83	20.7	6.1	.125	2.49	3.74
10	Harry Coveleski H. Coveleski	0.65	20.0	1907	PHN	4	1	0	1.000	0		6	0	0	0	10		2	0	3	1	4		72	0	2.70	1.35	2.00	0.00	8.3	4.2	.161	0.90	4.50
11	Raul Valdes R. Valdes	0.66	29.0	2012	PHI	26	3	1	.750	0	2.17	33	0	0	0	16	7	7	2	3	0	7	1	104	0	10.24	0.93	11.00	0.62	31.7	2.9	.212	2.17	4.97
12	Mike McCormick M. McCormick	0.66	24.1	1968	SFG	10	3	1	.750	0	1.48	21	0	0	1	11	4	4	1	5	0	5	1	90	1	7.77	1.85	4.20	0.37	23.3	5.6	.159	1.48	4.07
13	Lefty Leifield L. Leifield	0.67	31.1	1910	PIT	10	5	0	1.000	0		11	0	0	2	16		1	0	5	0	9		110	0	3.16	1.44	2.20	0.00	10.0	4.5	.170	0.29	4.60
14	Danny Coulombe D. Coulombe	0.67	29.2	2024	BAL	33	1	0	1.000	0	2.12	32	0	0	1	15	7	7	3	5	0	3	0	107	2	9.71	1.52	6.40	0.91	29.9	4.7	.179	2.12	4.55
15	Andrew Miller A. Miller	0.69	74.1	2016	TOT	70	10	1	.909	0	1.45	123	0	0	12	42	12	13	8	9	2	23	0	275	1	14.89	1.09	13.67	0.97	44.7	3.3	.256	1.57	5.09
16	Rube Marquard R. Marquard	0.70	23.0	1913	NYG	9	4	0	1.000	0	1.17	14	0	0	3	11	3	5	0	5	0	7		84	0	5.48	1.96	2.80	0.00	16.7	6.0	.169	1.96	4.30
17	Rube Waddell R. Waddell	0.71	28.1	1902	PHA	6	5	0	1.000	0	0.32	20	0	0	0	15	1	3	0	5	0	5			0	6.35	1.59	4.00	0.00				0.95	4.76
18	Cody Bradford C. Bradford	0.72	22.1	2023	TEX	12	3	0	1.000	0	2.82	21	0	0	0	15	7	7	5	1	1	5	0	84	0	8.46	0.40	21.00	2.01	25.0	1.2	.179	2.82	6.04
19	Bryan Hudson B. Hudson	0.72	62.1	2024	MIL	43	6	1	.857	0	1.73	62	0	0	0	28	12	12	7	17	3	1	0	231	1	8.95	2.45	3.65	1.01	26.8	7.4	.148	1.73	4.04
20	Sean Doolittle S. Doolittle	0.73	62.2	2014	OAK	61	2	4	.333	0	2.73	89	0	0	22	38	19	19	5	8	0	40	1	236	0	12.78	1.15	11.13	0.72	37.7	3.4	.246	2.73	5.46
21	Oliver Perez O. Perez	0.74	32.1	2018	CLE	51	1	1	.500	0	1.39	43	0	0	0	17	5	6	1	7	2	1	3	120	1	11.97	1.95	6.14	0.28	35.8	5.8	.239	1.67	4.73
22	A.J. Puk	0.75	57.2	2024	TOT	58	4	5	.444	0	1.72	76	0	0	3	32	11	14	4	11	1	9	2	217	1	11.86	1.72	6.91	0.62	35.0	5.1	.224	2.18	4.99
23	Matt Strahm M. Strahm	0.75	62.2	2024	PHI	66	6	2	.750	0	1.87	79	0	0	3	36	13	14	4	11	6	10	1	237	2	11.35	1.58	7.18	0.57	33.3	4.6	.234	2.01	5.17
24	David Wells D. Wells	0.75	21.1	1990	TOR	18	1	1	.500	0	3.38	18	0	0	3	13	8	9	3	3	1	8	0	79	0	7.59	1.27	6.00	1.27	22.8	3.8	.185	3.80	5.48
25	Ray Prim R. Prim	0.76	38.1	1945	CHC	15	3	2	.600	0	2.58	25	0	0	2	25	11	11	3	4	0	9		144	1	5.87	0.94	6.25	0.70	17.4	2.8	.196	2.58	5.87