what is the best playoff record for an mlb team since 1998

Since 1998, the Kansas City Royals have 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	50-33	.602	83	50	33	2,812	343	678	114	17	69	326	268	18	667	25	17	3,164	1,033	200	41	25	43	39	.241	.309	.367	.676
3	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
4	Red Sox	69-53	.566	122	69	53	4,263	632	1,106	243	17	151	607	472	45	963	56	18	4,828	1,836	411	17	31	45	111	.259	.337	.431	.768
5	Yankees	116-91	.560	207	116	91	7,018	908	1,685	311	23	246	870	797	81	1,723	112	43	7,999	2,780	580	45	58	66	143	.240	.322	.396	.718
6	Astros	77-65	.542	142	77	65	4,835	630	1,185	202	8	197	607	499	72	1,137	65	21	5,470	1,994	407	36	28	54	116	.245	.323	.412	.736
7	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
8	White Sox	14-12	.538	26	14	12	888	116	232	44	5	31	115	79	20	190	21	9	1,006	379	80	12	7	4	24	.261	.333	.427	.760
9	Mets	35-30	.538	65	35	30	2,204	283	513	89	7	66	275	239	32	521	46	12	2,522	814	162	23	24	24	36	.233	.314	.369	.683
10	Dodgers	84-73	.535	157	84	73	5,276	689	1,256	220	24	200	662	599	68	1,401	94	21	6,017	2,124	444	43	31	59	100	.238	.322	.403	.724
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	Rangers	33-32	.508	65	33	32	2,223	285	534	104	6	78	270	200	19	488	38	16	2,466	884	188	12	12	20	50	.240	.307	.398	.705
13	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
14	Cardinals	69-71	.493	140	69	71	4,625	584	1,106	221	18	134	542	435	64	1,034	66	21	5,236	1,765	373	80	32	61	89	.239	.311	.382	.693
15	Diamondbacks	28-29	.491	57	28	29	1,920	235	476	76	10	65	231	183	21	482	40	13	2,160	767	151	25	11	21	43	.248	.319	.399	.718
16	Blue Jays	20-22	.476	42	20	22	1,477	200	372	71	5	57	189	131	18	335	15	2	1,642	624	133	7	9	15	31	.252	.319	.422	.741
17	Mariners	17-19	.472	36	17	19	1,230	142	277	52	4	42	137	134	13	332	19	9	1,394	463	98	10	7	11	27	.225	.306	.376	.683
18	Guardians	36-41	.468	77	36	41	2,580	308	591	116	6	85	290	236	35	702	41	9	2,886	974	207	18	17	21	56	.229	.301	.378	.678
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	Braves	49-60	.450	109	49	60	3,692	404	849	135	14	108	391	375	29	974	59	23	4,142	1,336	257	28	18	39	62	.230	.305	.362	.666
21	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
22	Angels	21-27	.438	48	21	27	1,660	207	432	77	9	48	198	118	20	293	30	11	1,836	671	134	27	11	15	31	.260	.315	.404	.719
23	Padres	21-28	.429	49	21	28	1,627	181	381	62	7	52	171	150	19	405	19	7	1,819	613	121	10	13	9	32	.234	.304	.377	.681
24	Cubs	29-39	.426	68	29	39	2,244	234	485	88	9	78	228	194	25	625	34	10	2,494	825	175	22	9	20	43	.216	.285	.368	.652
25	Athletics	18-29	.383	47	18	29	1,601	175	379	76	6	50	164	147	16	381	13	1	1,779	617	132	5	10	10	30	.237	.306	.385	.691