The Cleveland Indians had the most wins by a team in a month in 2017, with 25 wins in September 2017.

	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	Indians	25	September 2017	4	.862	29	1,001	164	283	68	7	44	158	103	15	180	12	3	1,132	497	119	0	13	7	22	.283	.354	.497	.851
2	Astros	22	May 2017	7	.759	29	1,003	180	281	57	4	52	169	98	14	189	14	3	1,125	502	113	0	10	4	24	.280	.349	.500	.850
3	Dodgers	21	June 2017	7	.750	28	951	157	238	55	1	53	146	131	7	248	21	6	1,097	454	109	2	6	10	15	.250	.343	.477	.821
4	Astros	20	September 2017	8	.714	28	951	157	258	67	2	34	150	90	12	181	15	7	1,064	431	103	3	8	6	17	.271	.339	.453	.793
5	Yankees	20	September 2017	8	.714	28	947	168	259	50	4	50	162	110	12	208	19	2	1,082	467	104	1	12	5	16	.273	.352	.493	.846
6	Twins	20	August 2017	10	.667	30	1,015	177	284	49	11	50	170	106	12	228	22	4	1,153	505	110	8	12	4	26	.280	.351	.498	.849
7	Dodgers	20	July 2017	3	.870	23	767	107	211	44	7	35	105	88	6	199	7	5	869	374	86	4	4	10	17	.275	.353	.488	.840
8	Cubs	19	September 2017	9	.679	28	933	146	245	48	5	29	144	119	10	243	12	7	1,085	390	82	15	8	9	26	.263	.350	.418	.768
9	Indians	19	August 2017	9	.679	28	950	145	230	44	4	46	135	102	7	239	17	2	1,067	420	94	4	4	1	18	.242	.319	.442	.761
10	Dodgers	19	May 2017	9	.679	28	944	159	250	60	4	34	151	110	11	259	13	4	1,079	420	98	7	7	1	28	.265	.346	.445	.791
11	Red Sox	18	August 2017	9	.667	27	934	143	243	55	2	37	135	104	14	211	25	6	1,057	413	94	0	5	11	18	.260	.342	.442	.784
12	Angels	18	August 2017	10	.643	28	925	142	231	43	1	41	134	103	13	181	27	4	1,051	399	85	2	8	3	25	.250	.331	.431	.762
13	Nationals	18	August 2017	11	.621	29	950	129	244	48	6	26	122	92	6	231	19	3	1,076	382	80	13	15	11	26	.257	.322	.402	.724
14	Blue Jays	18	May 2017	10	.643	28	931	148	245	52	0	49	142	87	12	186	14	3	1,044	444	101	7	7	0	28	.263	.332	.477	.809
15	Red Sox	17	September 2017	10	.630	27	986	140	240	56	4	26	130	88	5	225	16	3	1,082	382	86	0	3	7	19	.243	.308	.387	.695
16	Cubs	17	August 2017	12	.586	29	1,018	191	295	47	5	48	179	110	17	274	13	6	1,159	496	100	7	7	10	17	.290	.366	.487	.854
17	Dodgers	17	August 2017	10	.630	27	902	121	211	45	2	36	115	109	16	222	15	3	1,038	368	83	5	6	5	15	.234	.325	.408	.733
18	Orioles	17	August 2017	12	.586	29	1,039	175	318	56	5	57	169	60	10	226	9	4	1,118	555	118	1	8	3	25	.306	.347	.534	.882
19	Marlins	17	August 2017	12	.586	29	965	131	250	39	7	39	126	94	15	215	16	7	1,094	420	85	13	7	9	17	.259	.332	.435	.767
20	Royals	17	June 2017	9	.654	26	904	136	250	56	6	34	130	55	3	198	7	0	971	420	96	1	8	3	24	.277	.318	.465	.782
21	Diamondbacks	17	June 2017	9	.654	26	897	152	241	57	6	32	148	94	9	235	13	7	1,014	406	95	8	6	7	16	.269	.342	.453	.795
22	Rockies	17	May 2017	12	.586	29	1,001	157	278	48	6	33	150	73	9	239	8	8	1,102	437	87	11	8	5	24	.278	.330	.437	.767
23	Diamondbacks	17	May 2017	11	.607	28	970	129	248	55	6	43	122	91	8	244	16	4	1,077	444	104	6	2	11	20	.256	.324	.458	.782
24	Rays	17	May 2017	13	.567	30	1,055	154	267	51	4	52	151	120	8	319	14	6	1,198	482	107	4	11	9	15	.253	.331	.457	.788
25	Nationals	17	April 2017	8	.680	25	898	170	265	58	3	43	166	102	5	194	11	4	1,015	458	104	6	4	15	23	.295	.369	.510	.879