most innings pitched in relief in a year with no walks

Len Swormstedt has pitched the most innings with exactly 0 walks allowed in a season, with 21 innings in his rookie season in 1906.

Interpreted as:

most innings pitched by a player in relief in a year with no walks

	NAME	IP	BB	SEASON	TM	G	W	L	W%	GS	ERA	SO	CG	SHO	SV	H	ER	R	HR	HBP	GF	IBB	TBF	WP	K/9	BB/9	HR/9	K%	BB%	WHIP	BABIP	RA	ERA-	FIP	FIP-	H/9	PRAA
1	Len Swormstedt L. Swormstedt	21.0	0	1906	BSA	3	1	1	.500	2	1.29	6	2	0	0	17	3	6	0	1	1		77	0	2.57	0.00	0.00	7.8	0.0	0.81	.243	2.57	48	1.94	75	7.29	1.5
2	Edward Mujica E. Mujica	18.1	0	2006	CLE	10	0	1	.000	0	2.95	12	0	0	0	25	6	6	1	1	2	0	78	0	5.89	0.00	0.49	15.4	0.0	1.36	.375	2.95	65	2.70	61	12.27	3.6
3	Lew Burdette L. Burdette	18.1	0	1967	CAL	19	1	0	1.000	0	4.91	8	0	0	1	16	10	10	4	1	8	0	71	0	3.93	0.00	1.96	11.3	0.0	0.87	.207	4.91	158	4.67	145	7.85	-3.1
4	Ned Williamson N. Williamson	18.0	0	1881	CWS	3	1	1	.500	1	2.00	2	1	0	0	14	4	9	0		2		67	1	1.00	0.00	0.00	3.0	0.0	0.78		4.50	70	2.46	86	7.00	0.9
5	Bill Scherrer B. Scherrer	17.1	0	1982	CIN	5	0	1	.000	2	2.60	7	0	0	0	17	5	7	0	0	2	0	69	0	3.63	0.00	0.00	10.1	0.0	0.98	.274	3.63	70	1.90	52	8.83	3.3
6	Cody Stashak C. Stashak	16.1	0	2022	MIN	11	3	0	1.000	0	3.86	15	0	0	0	16	7	7	1	0	4	0	65	0	8.27	0.00	0.55	23.1	0.0	0.98	.306	3.86	101	2.07	53	8.82	3.4
7	Ty Adcock T. Adcock	15.2	0	2023	SEA	12	0	0		0	3.45	11	0	0	0	11	6	7	4	0	4	0	58	0	6.32	0.00	2.30	19.0	0.0	0.70	.163	4.02	86	5.17	126	6.32	-1.9
8	Bret Saberhagen B. Saberhagen	15.0	0	2001	BOS	3	1	2	.333	3	6.00	10	0	0	0	19	10	11	3	1	0	0	64	0	6.00	0.00	1.80	15.6	0.0	1.27	.320	6.60	131	4.51	105	11.40	-0.4
9	Gid Gardner G. Gardner	14.0	0	1879	TRO	2	0	2	.000	2	5.79	3	2	0	0	27	9	21	0		0		74	7	1.93	0.00	0.00	4.1	0.0	1.93		13.50	234	2.31	93	17.36	0.2
10	Bruce Zimmermann B. Zimmermann	13.1	0	2023	BAL	7	2	0	1.000	0	4.73	14	0	0	0	17	7	8	3	2	4	0	61	1	9.45	0.00	2.03	23.0	0.0	1.27	.333	5.40	113	4.53	108	11.48	-0.5
11	John Halla J. Halla	12.2	0	1905	CLE	3	0	0		0	2.84	4	0	0	0	12	4	6	0	1	3		49	0	2.84	0.00	0.00	8.2	0.0	0.95	.273	4.26	110	2.13	80	8.53	0.7
12	Jamie Walker J. Walker	12.1	0	2009	BAL	22	0	0		0	5.11	9	0	0	0	19	7	8	5	1	2	0	55	1	6.57	0.00	3.65	16.4	0.0	1.54	.350	5.84	112	7.14	156	13.86	-3.4
13	Kolby Allard K. Allard	12.0	0	2025	CLE	4	2	0	1.000	0	1.50	3	0	0	0	8	2	3	0	0	2	0	42	0	2.25	0.00	0.00	7.1	0.0	0.67	.205	2.25	38	2.58	64	6.00	2
14	Evan Scribner E. Scribner	11.2	0	2014	OAK	13	1	0	1.000	0	4.63	11	0	0	0	11	6	6	4	1	6	0	47	0	8.49	0.00	3.09	23.4	0.0	0.94	.226	4.63	126	5.96	161	8.49	-3
15	Logan Gillaspie L. Gillaspie	11.1	0	2024	SDP	9	0	0		0	7.15	7	0	0	0	15	9	9	2	1	4	0	49	0	5.56	0.00	1.59	14.3	0.0	1.32	.333	7.15	180	4.48	112	11.91	-0.6
16	Mark Huismann M. Huismann	11.1	0	1989	BAL	8	0	0		0	6.35	13	0	0	1	13	8	8	0	0	1	0	48	1	10.32	0.00	0.00	27.1	0.0	1.15	.371	6.35	167	0.46	12	10.32	4.2
17	Jake Fishman J. Fishman	11.0	0	2022	MIA	7	0	0		0	4.09	6	0	0	0	13	5	5	0	3	2	0	48	0	4.91	0.00	0.00	12.5	0.0	1.18	.333	4.09	101	2.83	73	10.64	1.3
18	Ryan Merritt R. Merritt	11.0	0	2016	CLE	4	1	0	1.000	1	1.64	6	0	0	0	6	2	2	0	0	1	0	37	0	4.91	0.00	0.00	16.2	0.0	0.55	.194	1.64	37	2.05	48	4.91	2.7
19	Tom Dukes T. Dukes	11.0	0	1972	CAL	7	0	1	.000	0	1.64	8	0	0	1	11	2	3	1	1	3	0	43	1	6.55	0.00	0.82	18.6	0.0	1.00	.303	2.45	57	2.39	80	9.00	0.8
20	Al Spalding A. Spalding	11.0	0	1877	CWS	4	1	0	1.000	1	3.27	2	0	0	1	17	4	12	0		2		53	0	1.64	0.00	0.00	3.8	0.0	1.55		9.82	112	2.48	85	13.91	0.7
21	Bob Vines B. Vines	10.2	0	1924	SLN	2	0	0		0	9.28	0	0	0	0	23	11	13	1	0	0		55	0	0.00	0.00	0.84	0.0	0.0	2.16	.407	10.97	240	4.26	108	19.41	-0.4
22	Peter Moylan P. Moylan	10.1	0	2015	ATL	22	1	0	1.000	0	3.48	8	0	0	0	12	4	5	1	0	2	0	44	0	6.97	0.00	0.87	18.2	0.0	1.16	.314	4.35	90	2.84	75	10.45	1.1
23	Jason Lane J. Lane	10.1	0	2014	SDP	3	0	1	.000	1	0.87	6	0	0	0	7	1	1	1	0	0	0	39	0	5.23	0.00	0.87	15.4	0.0	0.68	.188	0.87	25	3.22	89	6.10	0.4
24	Dale Thayer D. Thayer	10.1	0	2011	NYM	11	0	3	.000	0	3.48	5	0	0	0	12	4	4	0	0	7	0	42	0	4.35	0.00	0.00	11.9	0.0	1.16	.324	3.48	94	2.05	54	10.45	2
25	Randy Messenger R. Messenger	10.1	0	2009	SEA	12	0	1	.000	0	4.35	5	0	0	0	13	5	5	3	0	7	0	43	1	4.35	0.00	2.61	11.6	0.0	1.26	.286	4.35	102	5.89	136	11.32	-1.9