50 pitchers are tied for the best walk percentage by a relief pitcher this season, with a walk percentage of 0.0. The first three are Zack Kelly, Ryan Yarbrough and Sean Burke.

Interpreted as:

lowest walk% for a reliever this regular season

	NAME	BB%	SEASON	TM	G	W	L	W%	GS	ERA	SO	CG	SHO	SV	IP	H	ER	R	HR	BB	HBP	GF	IBB	TBF	WP	K/9	BB/9	HR/9	K%	WHIP	BABIP	RA	H/9
1	Zack Kelly Z. Kelly	0.0	2026	BOS	1	0	0		0	0.00	1	0	0	0	1.0	0	0	0	0	0	0	0	0	3	0	9.00	0.00	0.00	33.3	0.00	.000	0.00	0.00
2	Ryan Yarbrough R. Yarbrough	0.0	2026	NYY	1	0	0		0	0.00	0	0	0	0	1.0	0	0	0	0	0	1	1	0	3	0	0.00	0.00	0.00	0.0	0.00	.000	0.00	0.00
3	Sean Burke S. Burke	0.0	2026	CWS	1	0	0		0	1.50	7	0	0	0	6.0	4	1	1	0	0	0	0	0	22	0	10.50	0.00	0.00	31.8	0.67	.267	1.50	6.00
4	James McCann J. McCann	0.0	2026	AZ	1	0	0		0	45.00	0	0	0	0	1.0	7	5	5	1	0	0	1	0	10	0	0.00	0.00	9.00	0.0	7.00	.667	45.00	63.00
5	Blade Tidwell B. Tidwell	0.0	2026	SFG	1	0	0		0	0.00	2	0	0	1	3.0	2	0	0	0	0	0	1	0	9	0	6.00	0.00	0.00	22.2	0.67	.286	0.00	6.00
6	Jacob Latz J. Latz	0.0	2026	TEX	1	0	0		0	0.00	0	0	0	0	1.0	0	0	0	0	0	0	1	0	3	0	0.00	0.00	0.00	0.0	0.00	.000	0.00	0.00
7	Steven Cruz S. Cruz	0.0	2026	KCR	3	0	0		0	10.13	3	0	0	0	2.2	3	3	3	3	0	0	2	0	11	0	10.13	0.00	10.13	27.3	1.13	.000	10.13	10.13
8	Martín Pérez M. Pérez	0.0	2026	ATL	1	0	0		0	0.00	3	0	0	0	4.1	2	0	0	0	0	0	1	0	14	0	6.23	0.00	0.00	21.4	0.46	.182	0.00	4.15
9	Raisel Iglesias R. Iglesias	0.0	2026	ATL	3	0	0		0	0.00	1	0	0	1	3.0	1	0	0	0	0	0	3	0	10	0	3.00	0.00	0.00	10.0	0.33	.111	0.00	3.00
10	Dylan Moore D. Moore	0.0	2026	PHI	1	0	0		0	0.00	0	0	0	0	0.2	1	0	0	0	0	0	1	0	3	0	0.00	0.00	0.00	0.0	1.50	.333	0.00	13.50
11	Nick Mears N. Mears	0.0	2026	KCR	2	0	0		0	0.00	3	0	0	0	2.0	1	0	0	0	0	0	0	0	6	0	13.50	0.00	0.00	50.0	0.50	.333	0.00	4.50
12	Jose Franco J. Franco	0.0	2026	CIN	1	0	0		0	0.00	0	0	0	0	1.2	3	0	0	0	0	0	0	0	7	0	0.00	0.00	0.00	0.0	1.80	.429	0.00	16.20
13	Jared Koenig J. Koenig	0.0	2026	MIL	2	0	0		0	0.00	4	0	0	0	2.0	1	0	0	0	0	0	0	0	7	0	18.00	0.00	0.00	57.1	0.50	.333	0.00	4.50
14	Grant Wolfram G. Wolfram	0.0	2026	BAL	2	0	0		0	7.71	4	0	0	0	2.1	4	2	2	0	0	0	0	0	11	0	15.43	0.00	0.00	36.4	1.71	.571	7.71	15.43
15	Rico Garcia R. Garcia	0.0	2026	BAL	3	1	0	1.000	0	0.00	4	0	0	0	3.1	0	0	0	0	0	0	1	0	10	0	10.80	0.00	0.00	40.0	0.00	.000	0.00	0.00
16	Mason Englert M. Englert	0.0	2026	TBR	2	0	0		0	18.00	1	0	0	0	2.0	5	4	4	2	0	0	1	0	11	0	4.50	0.00	9.00	9.1	2.50	.375	18.00	22.50
17	Victor Vodnik V. Vodnik	0.0	2026	COL	2	0	1	.000	0	9.00	1	0	0	0	2.0	4	2	2	1	0	1	1	0	10	0	4.50	0.00	4.50	10.0	2.00	.429	9.00	18.00
18	Daniel Palencia D. Palencia	0.0	2026	CHC	2	0	0		0	0.00	2	0	0	0	2.0	3	0	0	0	0	0	2	0	8	0	9.00	0.00	0.00	25.0	1.50	.500	0.00	13.50
19	Bryan Baker B. Baker	0.0	2026	TBR	2	0	0		0	0.00	2	0	0	0	2.0	0	0	0	0	0	0	1	0	6	0	9.00	0.00	0.00	33.3	0.00	.000	0.00	0.00
20	Tanner Banks T. Banks	0.0	2026	PHI	2	0	0		0	3.38	2	0	0	0	2.2	4	1	1	0	0	0	0	0	11	0	6.75	0.00	0.00	18.2	1.50	.444	3.38	13.50
21	Huascar Brazobán H. Brazobán	0.0	2026	NYM	4	0	0		0	0.00	3	0	0	0	4.0	2	0	0	0	0	0	0	0	14	0	6.75	0.00	0.00	21.4	0.50	.182	0.00	4.50
22	Aaron Bummer A. Bummer	0.0	2026	ATL	2	0	0		0	0.00	2	0	0	0	1.2	1	0	0	0	0	0	0	0	7	0	10.80	0.00	0.00	28.6	0.60	.200	0.00	5.40
23	Jakob Junis J. Junis	0.0	2026	TEX	4	0	0		0	0.00	4	0	0	0	5.0	1	0	0	0	0	0	0	0	16	0	7.20	0.00	0.00	25.0	0.20	.083	0.00	1.80
24	Mark Leiter Jr. M. Leiter Jr.	0.0	2026	ATH	3	0	0		0	3.38	1	0	0	1	2.2	5	1	1	0	0	1	1	0	13	0	3.38	0.00	0.00	7.7	1.88	.455	3.38	16.88
25	Chris Martin C. Martin	0.0	2026	TEX	4	1	1	.500	0	13.50	2	0	0	0	2.2	6	4	5	1	0	1	2	0	15	0	6.75	0.00	3.38	13.3	2.25	.455	16.88	20.25

Unlock 2x data

StatMuse has game-level data for walk percentage going back to the 1901 season.

Some of the information used here was obtained free of charge from Retrosheet.

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DATE	MATCHUP			TIME (ET)
Sun 4/5	SDP	@	BOS	1:35 PM
Mon 4/6	MIL	@	BOS	6:45 PM
Tue 4/7	MIL	@	BOS	6:45 PM
Wed 4/8	MIL	@	BOS	1:35 PM
Fri 4/10	BOS	@	STL	8:15 PM

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Yankees	6	1	.857
Blue Jays	4	4	.500	2.5
Orioles	3	4	.429	3.0
Rays	2	5	.286	4.0
Red Sox	2	7	.222	5.0
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Tigers	4	4	.500	1.0
Royals	3	4	.429	1.5
Twins	3	4	.429	1.5
White Sox	3	5	.375	2.0
AL West	W	L	PCT	GB
Astros	5	3	.625
Rangers	4	3	.571	0.5
Mariners	4	4	.500	1.0
Angels	3	5	.375	2.0
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Braves	6	2	.750
Marlins	5	2	.714	0.5
Phillies	4	3	.571	1.5
Mets	4	4	.500	2.0
Nationals	3	5	.375	3.0
NL Central	W	L	PCT	GB
Brewers	6	1	.857
Reds	4	3	.571	2.0
Pirates	4	3	.571	2.0
Cardinals	4	4	.500	2.5
Cubs	3	4	.429	3.0
NL West	W	L	PCT	GB
Dodgers	6	2	.750
Diamondbacks	3	5	.375	3.0
Padres	3	5	.375	3.0
Giants	3	5	.375	3.0
Rockies	2	5	.286	3.5