Since 2003, the Kansas City Royals had the best record by a team in the postseason, with a record of 25-12.

	TEAM	REC	W%	G	W	L	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS
1	Royals	25-12	.676	37	25	12	1,272	174	322	57	5	30	165	98	16	261	33	10	1,415	479	92	12	17	10	24	.253	.311	.377	.687
2	Giants	39-23	.629	62	39	23	2,107	241	502	89	13	40	226	183	13	500	16	15	2,345	737	142	25	17	20	29	.238	.301	.350	.651
3	White Sox	14-9	.609	23	14	9	796	109	215	38	3	30	109	64	19	174	17	9	894	349	71	10	5	3	19	.270	.337	.438	.776
4	Red Sox	64-44	.593	108	64	44	3,768	544	962	207	14	131	522	424	39	862	50	16	4,272	1,590	352	15	26	40	99	.255	.335	.422	.757
5	Astros	75-56	.573	131	75	56	4,478	601	1,113	193	8	188	579	463	65	1,039	61	19	5,065	1,886	389	32	27	48	102	.249	.326	.421	.747
6	Phillies	48-36	.571	84	48	36	2,716	371	627	138	13	110	354	316	38	700	69	16	3,108	1,121	261	21	17	37	54	.231	.318	.413	.731
7	Rangers	33-26	.559	59	33	26	2,039	283	507	99	6	77	268	187	19	444	37	15	2,268	849	182	11	12	20	46	.249	.316	.416	.732
8	Marlins	13-11	.542	24	13	11	831	91	194	38	4	18	88	69	12	182	11	7	927	294	60	11	4	10	16	.233	.300	.354	.654
9	Dodgers	86-73	.541	159	86	73	5,348	697	1,271	224	24	203	670	608	68	1,418	94	21	6,100	2,152	451	43	33	61	101	.238	.321	.402	.724
10	Mets	22-19	.537	41	22	19	1,363	180	317	48	6	46	177	146	23	342	26	5	1,558	515	100	10	16	13	25	.233	.314	.378	.692
11	Nationals	19-17	.528	36	19	17	1,221	147	274	47	3	40	140	132	12	343	17	1	1,387	447	90	13	9	13	16	.224	.304	.366	.670
12	Tigers	33-33	.500	66	33	33	2,229	234	529	107	4	66	222	202	25	561	25	10	2,485	842	177	22	7	21	56	.237	.307	.378	.685
13	Yankees	72-73	.497	145	72	73	4,940	637	1,167	222	16	183	612	562	57	1,270	77	22	5,623	1,970	421	24	40	41	96	.236	.319	.399	.718
14	Cardinals	59-60	.496	119	59	60	3,918	491	925	192	17	110	454	376	56	898	51	16	4,433	1,481	319	58	25	53	81	.236	.310	.378	.688
15	Diamondbacks	16-17	.485	33	16	17	1,122	144	290	42	9	48	142	105	10	308	33	7	1,256	494	99	12	7	7	25	.258	.326	.440	.766
16	Guardians	27-30	.474	57	27	30	1,913	212	437	85	3	57	198	164	24	539	26	7	2,128	699	145	17	10	18	40	.228	.296	.365	.661
17	Mariners	8-9	.471	17	8	9	611	72	133	26	2	24	69	65	9	188	8	3	690	235	52	1	4	6	13	.218	.300	.385	.685
18	Blue Jays	20-24	.455	44	20	24	1,553	205	394	78	5	58	194	137	21	355	16	3	1,729	656	141	9	9	16	34	.254	.321	.422	.743
19	Rockies	9-11	.450	20	9	11	685	71	158	31	5	14	69	61	4	173	6	4	765	241	50	9	6	5	9	.231	.295	.352	.647
20	Cubs	29-36	.446	65	29	36	2,150	230	468	86	9	77	224	189	25	601	33	7	2,391	803	172	19	8	19	43	.218	.288	.373	.661
21	Braves	31-39	.443	70	31	39	2,374	255	535	89	9	76	250	225	22	685	30	6	2,644	870	174	12	11	18	32	.225	.297	.366	.664
22	Rays	28-36	.438	64	28	36	2,135	253	476	79	8	95	248	184	18	641	39	14	2,349	856	182	5	7	9	43	.223	.289	.401	.690
23	Padres	14-21	.400	35	14	21	1,160	130	269	44	5	39	127	102	16	296	16	4	1,294	440	88	6	10	5	22	.232	.300	.379	.680
24	Pirates	3-5	.375	8	3	5	251	21	54	7	0	7	21	18	3	63	1	1	277	82	14	2	3	3	6	.215	.273	.327	.599
25	Athletics	12-20	.375	32	12	20	1,076	114	239	41	4	36	106	105	10	285	6	1	1,200	396	81	4	5	7	20	.222	.296	.368	.664