worst win percentage in a month by an mlb team in one season with at least 20 games played since 1920

Since 1920, the Baltimore Orioles have the worst winning percentage by a team with 20+ games played in a month, winning 4.3 percent of the time in April 1988.

	TEAM	W%	G	MONTH	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	Orioles	.043	23	April 1988	1	22	747	54	152	25	3	12	50	65	7	127	14	7	828	219	40	5	4	1	19	.203	.272	.293	.565
2	Twins	.103	29	May 1982	3	26	980	89	223	38	6	21	81	73	1	177	7	3	1,065	336	65	1	10	3	20	.228	.279	.343	.622
3	Athletics	.103	29	August 1943	3	26	992	88	225	33	8	2	81	66	6	82	17		1,080	280	43	16			21	.227	.279	.282	.561
4	Diamondbacks	.111	27	June 2021	3	24	921	103	208	46	2	17	96	85	7	240	4	4	1,021	309	65	5	3	1	10	.226	.295	.336	.631
5	Astros	.111	27	July 2012	3	24	891	85	205	46	4	18	80	85	9	217	23	9	1,011	313	68	15	11	5	19	.230	.300	.351	.651
6	Rangers	.115	26	September 1972	3	23	814	53	149	22	5	5	48	65	2	158	22	11	894	196	32	6	7	1	12	.183	.243	.241	.484
7	White Sox	.120	25	July 2024	3	22	833	74	177	43	2	18	69	52	7	234	20	5	895	278	63	1	2	1	18	.212	.264	.334	.598
8	Phillies	.120	25	May 1928	3	22	842	85	197	30	10	10	78	79	2	84	12		941	277	50	18				.234	.301	.329	.630
9	Tigers	.130	23	April 2003	3	20	741	54	136	21	2	11	49	69	7	163	5	8	828	194	34	7	4	1	10	.184	.258	.262	.520
10	Athletics	.130	23	July 1938	3	20	792	113	205	41	6	15	103	91	4	92	16		896	303	62	9				.259	.338	.383	.721
11	Mets	.138	29	July 1963	4	25	957	80	208	24	5	18	74	56	10	183	4	5	1,030	296	47	3	4	3	14	.217	.267	.309	.576
12	Rockies	.143	28	May 2025	4	24	926	85	205	39	9	22	84	73	5	257	13	8	1,012	328	70	3	5	2	20	.221	.280	.354	.635
13	Reds	.143	21	April 2022	3	18	668	66	136	30	0	14	63	57	10	190	4	4	740	208	44	0	5	0	18	.204	.274	.311	.586
14	Orioles	.143	28	August 2021	4	24	953	108	238	53	2	39	103	60	14	252	14	5	1,036	412	94	3	6	1	19	.250	.302	.432	.734
15	Orioles	.143	28	September 2002	4	24	946	82	201	49	4	23	80	64	12	187	18	6	1,034	327	76	6	6	2	19	.212	.269	.346	.615
16	Phillies	.143	28	August 1936	4	24	964	101	257	33	6	11	96	88	2	106	7		1,073	335	50	19				.267	.329	.348	.677
17	Red Sox	.143	28	June 1927	4	24	948	113	258	47	17	3	108	69	3	74	8		1,062	348	67	42				.272	.324	.367	.691
18	Athletics	.143	28	June 1920	4	24	958	97	237	36	15	8	84	67	7	109	15		1,057	327	59	25				.247	.301	.341	.643
19	Tigers	.148	27	May 1996	4	23	898	84	199	35	4	27	79	65	6	205	5	9	979	323	66	6	4	2	24	.222	.277	.360	.637
20	Royals	.150	20	April 1992	3	17	661	54	137	39	2	10	49	61	9	99	18	8	745	210	51	8	6	1	18	.207	.281	.318	.599
21	Rockies	.154	26	April 2025	4	22	854	87	180	42	6	24	86	80	11	268	12	3	954	306	72	4	5	3	17	.211	.285	.358	.644
22	White Sox	.154	26	August 2024	4	22	875	79	200	36	2	16	78	61	4	226	12	8	946	288	54	2	4	0	12	.229	.281	.329	.610
23	Phillies	.154	26	June 1997	4	22	874	94	213	54	10	13	87	91	5	172	10	6	992	326	77	11	11	6	14	.244	.315	.373	.688
24	Tigers	.154	26	September 1996	4	22	896	118	222	33	3	32	113	89	2	249	13	5	1,010	357	68	11	12	3	14	.248	.313	.398	.712
25	Rockies	.160	25	September 2025	4	21	818	81	183	31	2	22	79	53	6	260	16	5	890	284	55	5	8	0	17	.224	.273	.347	.621