Corey Seager has the most bases on balls in an ALDS, with 9 walks.

Interpreted as:

most bb by a player in one alds

	NAME	BB	SEASON	SERIES	TM	G	AB	R	H	2B	3B	HR	RBI	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS
1	Corey Seager C. Seager	9	2023	ALDS	TEX	3	6	4	2	0	0	1	1	0	0	0	0	15	5	1	0	0	1	0	.333	.733	.833	1.567
2	Ji Man Choi J. Man Choi	7	2019	ALDS	TBR	5	15	2	3	0	0	1	1	0	10	0	0	22	6	1	0	0	0	0	.200	.455	.400	.855
3	Jason Giambi J. Giambi	7	2000	ALDS	OAK	5	14	2	4	0	0	0	1	0	2	0	0	22	4	0	0	1	1	0	.286	.500	.286	.786
4	Jose Offerman J. Offerman	7	1999	ALDS	BOS	5	18	4	7	1	0	1	6	0	0	0	1	25	11	2	0	0	0	0	.389	.560	.611	1.171
5	Bernie Williams B. Williams	7	1995	ALDS	NYY	5	21	8	9	2	0	2	5	0	3	1	0	28	17	4	0	0	1	0	.429	.571	.810	1.381
6	Yordan Alvarez Y. Alvarez	6	2021	ALDS	HOU	4	11	4	3	1	0	1	3	0	6	0	0	17	7	2	0	0	0	0	.273	.529	.636	1.166
7	Didi Gregorius D. Gregorius	6	2017	ALDS	NYY	5	17	3	4	0	0	2	3	0	3	0	0	23	10	2	0	0	2	0	.235	.435	.588	1.023
8	Colby Rasmus C. Rasmus	6	2015	ALDS	HOU	5	14	3	6	1	0	3	5	0	6	1	0	20	16	4	0	0	2	0	.429	.600	1.143	1.743
9	David Ortiz D. Ortiz	6	2007	ALDS	BOS	3	7	5	5	0	0	2	3	0	1	0	0	13	11	2	0	0	2	0	.714	.846	1.571	2.418
10	Jorge Posada J. Posada	6	2005	ALDS	NYY	5	13	3	3	1	0	1	2	0	2	0	0	19	7	2	0	0	0	0	.231	.474	.538	1.012
11	Alex Rodriguez A. Rodriguez	6	2005	ALDS	NYY	5	15	2	2	1	0	0	0	2	5	1	1	23	3	1	0	0	0	2	.133	.435	.200	.635
12	Edgar Martinez E. Martinez	6	1995	ALDS	SEA	5	21	6	12	3	0	2	10	0	2	0	0	27	21	5	0	0	2	0	.571	.667	1.000	1.667
13	Randy Velarde R. Velarde	6	1995	ALDS	NYY	5	17	3	3	0	0	0	1	1	4	0	1	24	3	0	0	0	0	0	.176	.417	.176	.593
14	Aaron Judge A. Judge	5	2024	ALDS	NYY	4	13	2	2	1	0	0	0	0	5	1	0	18	3	1	0	0	0	1	.154	.389	.231	.620
15	Gleyber Torres G. Torres	5	2024	ALDS	NYY	4	15	4	3	1	0	1	3	0	3	0	0	20	7	2	0	0	0	0	.200	.400	.467	.867
16	Edwin Encarnacion E. Encarnacion	5	2015	ALDS	TOR	5	18	3	6	1	0	1	3	0	1	0	0	23	10	2	0	0	3	0	.333	.478	.556	1.034
17	David Ortiz D. Ortiz	5	2013	ALDS	BOS	4	13	4	5	1	0	2	3	0	2	0	0	18	12	3	0	0	0	1	.385	.556	.923	1.479
18	Mark Teixeira M. Teixeira	5	2012	ALDS	NYY	5	17	1	6	0	0	0	1	0	2	1	0	22	6	0	0	0	1	1	.353	.500	.353	.853
19	Miguel Cabrera M. Cabrera	5	2011	ALDS	DET	5	15	2	3	0	0	1	3	0	5	1	0	20	6	1	0	0	3	1	.200	.400	.400	.800
20	Travis Hafner T. Hafner	5	2007	ALDS	CLE	4	16	4	4	0	0	1	2	0	3	0	0	21	7	1	0	0	1	0	.250	.429	.438	.866
21	Hideki Matsui H. Matsui	5	2007	ALDS	NYY	4	11	4	2	0	0	0	0	0	2	0	0	16	2	0	0	0	1	0	.182	.438	.182	.619
22	Manny Ramirez M. Ramirez	5	2007	ALDS	BOS	3	8	3	3	0	0	2	4	0	2	0	0	13	9	2	0	0	0	0	.375	.615	1.125	1.740
23	Mark Bellhorn M. Bellhorn	5	2004	ALDS	BOS	3	11	2	1	0	0	0	0	0	4	0	0	16	1	0	0	0	0	0	.091	.375	.091	.466
24	David Ortiz D. Ortiz	5	2004	ALDS	BOS	3	11	4	6	2	0	1	4	0	2	0	0	16	11	3	0	0	3	0	.545	.688	1.000	1.688
25	Scott Hatteberg S. Hatteberg	5	2003	ALDS	OAK	5	17	3	3	0	0	0	0	0	3	0	0	22	3	0	0	0	0	0	.176	.364	.176	.540