Alex Blandino, Mickey Jannis and Drew Carlton were tied for the most walks allowed per strikeout in 2021, with 4.

	NAME	BB/SO	BB	SO	SEASON	TM	G	W	L	W%	GS	ERA	CG	SHO	SV	IP	H	ER	R	HR	HBP	GF	IBB	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	ERA-	FIP	FIP-	H/9	PRAA
1	Alex Blandino A. Blandino	4	4	1	2021	CIN	4	0	0		0	9.82	0	0	0	3.2	4	4	5	1	0	2	0	18	0	2.45	9.82	0.25	2.45	5.6	22.2	2.18	.250	12.27	223	9.43	212	9.82	-1.9
2	Mickey Jannis M. Jannis	4	4	1	2021	BAL	1	0	0		0	18.90	0	0	0	3.1	8	7	7	3	0	0	0	21	0	2.70	10.80	0.25	8.10	4.8	19.0	3.60	.385	18.90	429	17.86	394	21.60	-4.6
3	Drew Carlton D. Carlton	4	4	1	2021	DET	4	0	0		0	4.91	0	0	0	3.2	6	2	2	1	0	1	0	19	0	2.45	9.82	0.25	2.45	5.3	21.1	2.73	.385	4.91	114	9.43	223	14.73	-2.1
4	Hans Crouse H. Crouse	3.5	7	2	2021	PHI	2	0	2	.000	2	5.14	0	0	0	7.0	4	4	4	2	0	0	0	32	0	2.57	9.00	0.29	2.57	6.3	21.9	1.57	.095	5.14	123	9.31	215	5.14	-3.8
5	Colten Brewer C. Brewer	3	3	1	2021	BOS	1	0	0		0	36.00	0	0	0	1.0	4	4	4	0	0	0	0	9	0	9.00	27.00	0.33	0.00	11.1	33.3	7.00	.800	36.00	786	10.16	235	36.00	-0.6
6	Wilmer Difo W. Difo	3	3	1	2021	PIT	2	0	0		0	36.00	0	0	0	2.0	9	8	8	1	0	2	0	18	0	4.50	13.50	0.33	4.50	5.6	16.7	6.00	.615	36.00	850	13.16	310	40.50	-2
7	Nick Snyder N. Snyder	3	3	1	2021	TEX	4	0	0		0	4.91	0	0	0	3.2	3	2	2	0	0	2	0	15	0	2.45	7.36	0.33	0.00	6.7	20.0	1.64	.273	4.91	111	5.07	115	7.36	-0.3
8	Nick Anderson N. Anderson	2	2	1	2021	TBR	6	0	1	.000	0	4.50	0	0	1	6.0	4	3	3	2	0	2	0	24	0	1.50	3.00	0.50	3.00	4.2	8.3	1.00	.105	4.50	110	8.16	199	6.00	-2.8
9	Brandon Brennan B. Brennan	2	2	1	2021	BOS	1	0	0		0	0.00	0	0	0	3.0	3	0	0	0	0	0	0	11	0	3.00	6.00	0.50	0.00	9.1	18.2	1.67	.375	0.00	0	4.50	104	9.00	-0.1
10	Ryan Castellani R. Castellani	2	4	2	2021	COL	1	0	0		1	5.40	0	0	0	3.1	5	2	2	1	1	0	0	17	0	5.40	10.80	0.50	2.70	11.8	23.5	2.70	.444	5.40	112	10.36	233	13.50	-2.1
11	Jace Fry J. Fry	2	6	3	2021	CWS	6	0	1	.000	0	10.80	0	0	0	6.2	10	8	8	1	1	2	0	31	2	4.05	8.10	0.50	1.35	9.7	19.4	2.40	.450	10.80	248	7.36	166	13.50	-2.1
12	Luis Madero L. Madero	2	8	4	2021	MIA	6	0	0		0	9.00	0	0	0	12.0	13	12	12	3	1	3	1	56	0	3.00	6.00	0.50	2.25	7.1	14.3	1.75	.250	9.00	215	8.00	192	9.75	-5.2
13	Vinny Nittoli V. Nittoli	2	2	1	2021	SEA	1	0	0		0	18.00	0	0	0	1.0	1	2	2	1	0	0	0	6	0	9.00	18.00	0.50	9.00	16.7	33.3	3.00	.000	18.00	434	20.16	486	9.00	-1.8
14	Felix Pena F. Pena	2	4	2	2021	LAA	2	0	0		0	37.80	0	0	0	1.2	7	7	7	0	0	0	0	16	1	10.80	21.60	0.50	0.00	12.5	25.0	6.60	.700	37.80	858	7.96	183	37.80	-0.7
15	Eric Yardley E. Yardley	2	10	5	2021	MIL	17	0	0		0	6.75	0	0	0	18.2	24	14	15	3	3	5	2	89	1	2.41	4.82	0.50	1.45	5.6	11.2	1.82	.309	7.23	161	6.81	159	11.57	-5.2
16	Brody Koerner B. Koerner	2	2	1	2021	NYY	2	0	0		0	3.00	0	0	0	3.0	2	1	1	0	1	2	0	13	0	3.00	6.00	0.50	0.00	7.7	15.4	1.33	.222	3.00	71	5.50	127	6.00	-0.4
17	Brandyn Sittinger B. Sittinger	2	2	1	2021	ARI	5	0	1	.000	0	7.71	0	0	0	4.2	5	4	4	3	1	0	0	21	0	1.93	3.86	0.50	5.79	4.8	9.5	1.50	.143	7.71	184	13.02	317	9.64	-4.8
18	Darren McCaughan D. McCaughan	2	4	2	2021	SEA	2	0	0		1	8.00	0	0	0	9.0	8	8	8	3	1	0	0	39	0	2.00	4.00	0.50	3.00	5.1	10.3	1.33	.172	8.00	193	8.72	210	8.00	-4.7
19	Jorge Guzman J. Guzman	2	6	3	2021	MIA	2	0	0		0	32.40	0	0	0	1.2	4	6	6	0	0	0	1	15	0	16.20	32.40	0.50	0.00	20.0	40.0	6.00	.667	32.40	772	10.36	249	21.60	-1.2
20	Andrés Muñoz A. Muñoz	2	2	1	2021	SEA	1	0	0		0	0.00	0	0	0	0.2	0	0	0	0	0	0	0	4	0	13.50	27.00	0.50	0.00	25.0	50.0	3.00	.000	0.00	0	9.16	221	0.00	-0.4
21	Shea Spitzbarth S. Spitzbarth	2	2	1	2021	PIT	5	0	0		0	3.60	0	0	0	5.0	4	2	2	1	1	4	0	22	0	1.80	3.60	0.50	1.80	4.5	9.1	1.20	.176	3.60	85	7.16	169	7.20	-1.6
22	Isaac Mattson I. Mattson	1.67	5	3	2021	BAL	4	0	0		0	6.23	0	0	0	4.1	5	3	3	0	0	3	0	23	1	6.23	10.38	0.60	0.00	13.0	21.7	2.31	.333	6.23	141	5.24	116	10.38	-0.3
23	Luis Frías L. Frías	1.67	5	3	2021	ARI	3	0	0		0	2.70	0	0	0	3.1	2	1	1	0	0	1	0	16	0	8.10	13.50	0.60	0.00	18.8	31.3	2.10	.250	2.70	64	5.86	143	5.40	-0.7
24	Aaron Northcraft A. Northcraft	1.6	8	5	2021	SDP	5	1	0	1.000	0	2.25	0	0	0	8.0	5	2	2	1	0	3	0	34	0	5.63	9.00	0.63	1.13	14.7	23.5	1.63	.200	2.25	57	6.54	156	5.63	-2.1
25	Nick Tropeano N. Tropeano	1.5	3	2	2021	TOT	5	1	0	1.000	0	2.25	0	0	0	8.0	8	2	3	1	0	1	0	34	1	2.25	3.38	0.67	1.13	5.9	8.8	1.38	.250	3.38	56	5.41	131	9.00	-1.2