Hideki Matsui has gotten the most doubles in an ALCS, with 6 doubles.

Interpreted as:

most doubles by a player in one alcs

	NAME	2B	SEASON	SERIES	TM	G	AB	R	H	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS
1	Hideki Matsui H. Matsui	6	2004	ALCS	NYY	7	34	9	14	1	2	10	2	0	4	0	0	36	28	9	0	0	0	0	.412	.444	.824	1.268
2	Jeff Mathis J. Mathis	5	2009	ALCS	LAA	5	12	2	7	0	0	1	0	0	2	0	0	12	12	5	0	0	0	0	.583	.583	1.000	1.583
3	Miguel Cabrera M. Cabrera	4	2011	ALCS	DET	6	20	5	8	0	3	7	7	0	6	1	0	27	21	7	0	0	2	0	.400	.556	1.050	1.606
4	Josh Hamilton J. Hamilton	4	2011	ALCS	TEX	6	26	4	8	0	0	5	1	0	4	0	0	29	12	4	0	2	1	0	.308	.310	.462	.772
5	Jorge Posada J. Posada	4	2003	ALCS	NYY	7	27	5	8	0	1	6	3	0	4	0	0	30	15	5	0	0	0	1	.296	.367	.556	.922
6	Tom Brunansky T. Brunansky	4	1987	ALCS	MIN	5	17	5	7	0	2	9	4	0	3	0	0	21	17	6	0	0	0	0	.412	.524	1.000	1.524
7	Damaso Garcia D. Garcia	4	1985	ALCS	TOR	7	30	4	7	0	0	1	3	0	3	0	0	33	11	4	0	0	0	0	.233	.303	.367	.670
8	Matty Alou M. Alou	4	1972	ALCS	OAK	5	21	2	8	0	0	2	0	1	2	1	1	23	12	4	1	0	0	1	.381	.409	.571	.981
9	George Springer G. Springer	3	2025	ALCS	TOR	7	29	7	8	0	3	7	3	1	6	0	0	33	20	6	0	0	0	1	.276	.364	.690	1.053
10	Vladimir Guerrero Jr. V. Guerrero Jr.	3	2025	ALCS	TOR	7	26	6	10	0	3	3	4	1	2	0	0	31	22	6	0	0	3	0	.385	.484	.846	1.330
11	Jose Altuve J. Altuve	3	2023	ALCS	HOU	7	32	9	10	0	3	5	2	0	2	1	0	34	22	6	0	0	0	0	.313	.353	.688	1.040
12	Evan Carter E. Carter	3	2023	ALCS	TEX	7	25	5	6	0	0	2	3	0	8	2	0	28	9	3	0	0	0	0	.240	.321	.360	.681
13	Yordan Alvarez Y. Alvarez	3	2021	ALCS	HOU	6	23	7	12	1	1	6	2	0	5	0	0	26	20	5	0	1	0	0	.522	.538	.870	1.408
14	George Springer G. Springer	3	2018	ALCS	HOU	5	21	2	8	0	1	5	3	0	5	1	0	24	14	4	0	0	0	0	.381	.458	.667	1.125
15	Carlos Correa C. Correa	3	2017	ALCS	HOU	7	27	4	9	0	1	3	1	0	5	0	0	28	15	4	0	0	0	0	.333	.357	.556	.913
16	Yuli Gurriel Y. Gurriel	3	2017	ALCS	HOU	7	24	2	6	0	0	4	2	0	4	0	0	26	9	3	0	0	0	0	.250	.308	.375	.683
17	Kevin Pillar K. Pillar	3	2015	ALCS	TOR	6	21	3	5	0	0	2	3	0	3	2	0	24	8	3	0	0	0	0	.238	.333	.381	.714
18	Ben Zobrist B. Zobrist	3	2015	ALCS	KCR	6	25	8	8	0	2	4	2	0	2	0	0	27	17	5	0	0	0	1	.320	.370	.680	1.050
19	Xander Bogaerts X. Bogaerts	3	2013	ALCS	BOS	4	6	4	3	0	0	0	3	0	1	0	0	9	6	3	0	0	0	0	.500	.667	1.000	1.667
20	Jhonny Peralta J. Peralta	3	2013	ALCS	DET	6	21	1	6	0	0	1	1	0	3	0	0	22	9	3	0	0	0	1	.286	.318	.429	.747
21	Adrian Beltre A. Beltre	3	2011	ALCS	TEX	6	27	4	6	0	0	2	2	0	10	0	0	29	9	3	0	0	1	0	.222	.276	.333	.609
22	Michael Young M. Young	3	2011	ALCS	TEX	6	28	3	7	0	1	7	1	0	6	0	0	29	13	4	0	0	0	1	.250	.276	.464	.740
23	Nelson Cruz N. Cruz	3	2010	ALCS	TEX	6	20	6	7	0	2	5	3	0	6	0	0	23	16	5	0	0	1	0	.350	.435	.800	1.235
24	Derek Jeter D. Jeter	3	2010	ALCS	NYY	6	26	2	6	1	0	1	2	0	7	0	0	28	11	4	0	0	0	1	.231	.286	.423	.709
25	Michael Young M. Young	3	2010	ALCS	TEX	6	27	3	9	0	0	4	1	0	7	0	0	28	12	3	0	0	0	2	.333	.357	.444	.802