The St. Louis Cardinals had the most wins by a team in a month in 2018, with 22 wins in August 2018.

	TEAM	W	MONTH	L	W%	G	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS
1	Cardinals	22	August 2018	6	.786	28	970	148	265	58	2	40	144	85	21	219	14	5	1,085	447	100	4	5	12	11	.273	.343	.461	.804
2	Astros	21	September 2018	6	.778	27	884	131	219	36	2	32	121	96	13	174	9	3	1,001	355	70	2	6	3	21	.248	.328	.402	.730
3	Nationals	20	May 2018	7	.741	27	896	119	217	47	3	42	114	86	7	202	12	6	999	396	92	7	3	7	18	.242	.313	.442	.754
4	Brewers	19	September 2018	7	.731	26	860	144	215	41	5	39	133	114	13	219	21	3	999	383	85	2	10	10	16	.250	.343	.445	.788
5	Rockies	19	September 2018	9	.679	28	945	154	258	58	7	43	149	92	11	237	19	4	1,062	459	108	7	7	8	22	.273	.342	.486	.828
6	Rays	19	September 2018	9	.679	28	943	152	257	57	14	32	138	115	19	238	30	11	1,095	438	103	7	11	7	18	.273	.359	.464	.824
7	Indians	19	August 2018	9	.679	28	919	132	233	41	0	31	126	96	13	174	25	8	1,042	367	72	6	8	7	19	.254	.330	.399	.729
8	Red Sox	19	July 2018	6	.760	25	864	134	235	57	8	24	131	90	10	195	18	4	972	380	89	2	6	10	23	.272	.345	.440	.785
9	Astros	19	June 2018	8	.704	27	921	144	253	50	5	41	140	102	4	171	13	2	1,037	436	96	4	6	4	35	.275	.348	.473	.821
10	Mariners	19	June 2018	9	.679	28	962	126	255	36	3	40	122	73	9	228	10	10	1,056	417	79	5	7	4	23	.265	.321	.433	.754
11	Diamondbacks	19	June 2018	9	.679	28	961	152	239	48	11	37	142	104	14	241	12	5	1,096	420	96	6	11	12	15	.249	.328	.437	.765
12	Brewers	19	May 2018	8	.704	27	908	132	240	48	2	37	126	91	5	242	16	3	1,015	403	87	4	7	5	26	.264	.332	.444	.776
13	Red Sox	19	April 2018	6	.760	25	892	151	248	64	3	30	143	83	13	197	16	3	1,000	408	97	1	11	5	17	.278	.344	.457	.802
14	Dodgers	18	September 2018	9	.667	27	938	161	257	53	8	44	150	119	10	245	15	4	1,074	458	105	3	4	10	22	.274	.360	.488	.849
15	Mets	18	September 2018	10	.643	28	940	120	217	50	6	31	116	107	13	252	16	8	1,074	372	87	7	7	4	15	.231	.316	.396	.712
16	Red Sox	18	August 2018	9	.667	27	924	166	254	65	6	34	154	103	8	195	19	12	1,045	433	105	2	8	8	24	.275	.350	.469	.819
17	Cubs	18	August 2018	10	.643	28	959	113	244	41	5	32	106	85	11	240	7	9	1,065	391	78	3	7	13	16	.254	.320	.408	.728
18	Athletics	18	August 2018	9	.667	27	931	125	241	63	2	39	122	78	15	210	6	1	1,030	425	104	1	5	3	23	.259	.325	.456	.781
19	Giants	18	June 2018	10	.643	28	949	118	230	52	5	28	113	88	13	229	10	6	1,066	376	85	6	10	14	18	.242	.312	.396	.708
20	Yankees	18	June 2018	9	.667	27	905	107	210	42	4	44	106	84	10	240	10	6	1,006	392	90	0	7	4	20	.232	.302	.433	.735
21	Red Sox	18	May 2018	11	.621	29	1,008	144	263	58	7	50	138	85	7	222	22	5	1,108	485	115	1	7	2	22	.261	.321	.481	.802
22	Mariners	18	May 2018	11	.621	29	987	118	258	48	4	25	111	86	20	224	22	6	1,114	389	77	12	9	1	25	.261	.330	.394	.724
23	Diamondbacks	18	April 2018	7	.720	25	835	114	194	48	8	33	110	94	4	235	12	7	946	357	89	5	8	5	18	.232	.310	.428	.738
24	Astros	18	April 2018	9	.667	27	901	135	231	45	2	28	130	106	11	234	11	5	1,034	364	75	2	14	0	17	.256	.337	.404	.741
25	Braves	17	August 2018	13	.567	30	1,014	130	264	49	5	36	124	75	13	221	13	8	1,121	431	90	10	9	8	17	.260	.317	.425	.742