Evan Carter has hit the most doubles in a postseason, with 9 doubles in his rookie season in 2023.

Interpreted as:

most doubles by a player postseason single year

	NAME	2B	SEASON	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	Evan Carter E. Carter	9	2023	TEX	17	60	9	18	0	1	6	10	2	19	3	0	72	30	10	0	0	0	0	.300	.417	.500	.917
2	Mookie Betts M. Betts	8	2020	LAD	18	71	15	21	0	2	8	10	0	16	6	0	82	35	10	0	1	0	1	.296	.378	.493	.871
3	Ben Zobrist B. Zobrist	8	2015	KCR	16	66	15	20	0	2	6	7	0	6	1	0	75	34	10	1	1	2	2	.303	.365	.515	.880
4	David Freese D. Freese	8	2011	STL	18	63	12	25	1	5	21	7	1	14	0	0	71	50	14	0	0	1	3	.397	.465	.794	1.258
5	Albert Pujols A. Pujols	8	2011	STL	18	68	15	24	0	5	16	12	2	11	1	1	82	47	13	0	0	8	1	.353	.463	.691	1.155
6	Ketel Marte K. Marte	7	2023	ARI	17	73	6	24	1	2	11	6	0	18	3	1	79	39	10	0	0	0	1	.329	.380	.534	.914
7	Bryce Harper B. Harper	7	2022	PHI	17	63	12	22	0	6	13	6	1	14	1	0	71	47	13	1	0	1	3	.349	.414	.746	1.160
8	Anthony Rendon A. Rendon	7	2019	WSH	17	61	11	20	0	3	15	11	0	10	0	0	75	36	10	0	3	2	0	.328	.413	.590	1.003
9	Yuli Gurriel Y. Gurriel	7	2017	HOU	18	69	5	21	1	2	8	4	0	10	0	0	73	36	10	0	0	0	1	.304	.342	.522	.864
10	Pablo Sandoval P. Sandoval	7	2014	SFG	17	71	12	26	0	0	5	5	2	11	0	0	78	33	7	0	0	1	2	.366	.423	.465	.888
11	Ryan Braun R. Braun	7	2011	MIL	11	42	7	17	0	2	10	4	1	9	1	0	47	30	9	0	0	0	0	.405	.468	.714	1.182
12	Josh Hamilton J. Hamilton	7	2011	TEX	17	70	9	19	0	1	13	3	0	8	0	0	76	29	8	0	3	2	1	.271	.289	.414	.704
13	Michael Young M. Young	7	2011	TEX	17	70	7	16	0	2	12	3	0	15	0	0	74	29	9	0	1	0	1	.229	.257	.414	.671
14	Nelson Cruz N. Cruz	7	2010	TEX	16	60	13	19	0	6	11	3	0	17	1	0	63	44	13	0	0	1	1	.317	.349	.733	1.083
15	Jayson Werth J. Werth	7	2008	PHI	14	55	9	17	1	2	4	7	0	17	4	0	62	32	10	0	0	0	1	.309	.387	.582	.969
16	Mike Lowell M. Lowell	7	2007	BOS	14	51	10	18	0	2	15	6	1	4	1	0	61	31	9	0	3	1	2	.353	.410	.608	1.018
17	Hideki Matsui H. Matsui	7	2004	NYY	11	51	12	21	1	3	13	5	0	8	0	0	57	39	11	0	1	1	0	.412	.456	.765	1.221
18	Corey Seager C. Seager	6	2023	TEX	17	66	18	21	0	6	12	15	1	12	0	0	82	45	12	0	0	2	0	.318	.451	.682	1.133
19	Justin Turner J. Turner	6	2020	LAD	18	68	15	17	0	3	6	7	2	15	0	0	78	32	9	0	1	0	1	.250	.333	.471	.804
20	Jose Altuve J. Altuve	6	2019	HOU	18	76	14	25	0	5	9	5	0	7	2	1	82	46	11	0	1	0	4	.329	.366	.605	.971
21	Josh Donaldson J. Donaldson	6	2016	TOR	9	36	6	15	0	1	5	3	0	7	0	0	39	24	7	0	0	1	1	.417	.462	.667	1.128
22	Justin Turner J. Turner	6	2015	LAD	5	19	2	10	0	0	4	1	0	3	1	0	20	16	6	0	0	1	0	.526	.550	.842	1.392
23	Alex Gordon A. Gordon	6	2014	KCR	15	54	7	11	0	1	11	6	3	16	4	0	63	20	7	0	0	2	1	.204	.317	.370	.688
24	Hunter Pence H. Pence	6	2014	SFG	17	66	12	22	0	1	8	8	0	9	2	2	74	31	7	0	0	0	1	.333	.405	.470	.875
25	Carlos Beltran C. Beltran	6	2012	STL	12	42	8	15	0	3	6	7	0	5	3	0	50	30	9	0	1	0	1	.357	.440	.714	1.154