worst mlb winning percentage in a season live ball era

Since 1920, the Boston Braves have the lowest winning percentage by a team in a season, winning 24.8 percent of the time in 1935.

	TEAM	W%	SEASON	W	L	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	Braves	.248	1935	38	115	153	5,309	575	1,396	233	33	75	544	353	19	436	20		5,761	1,920	341	80			139	.263	.311	.362	.673
2	Mets	.250	1962	40	120	161	5,492	617	1,318	166	40	139	573	616	32	991	59	48	6,242	1,981	345	58	44	29	122	.240	.318	.361	.679
3	White Sox	.253	2024	41	121	162	5,383	507	1,187	226	9	133	485	395	43	1,403	90	33	5,866	1,830	368	18	27	8	116	.221	.278	.340	.618
4	Rockies	.265	2025	43	119	162	5,408	597	1,281	253	37	160	581	395	48	1,531	87	39	5,907	2,088	450	21	35	5	118	.237	.293	.386	.679
5	Tigers	.265	2003	43	119	162	5,466	591	1,312	201	39	153	553	443	47	1,099	98	63	6,070	2,050	393	65	49	24	114	.240	.300	.375	.675
6	Pirates	.273	1952	42	112	155	5,193	515	1,201	181	30	92	478	486	26	724	43	41	5,775	1,718	303	70			104	.231	.300	.331	.631
7	Phillies	.278	1942	42	109	151	5,060	394	1,174	168	37	44	356	392	16	487	37		5,557	1,548	249	89			109	.232	.289	.306	.595
8	Phillies	.279	1941	43	111	155	5,233	501	1,277	188	38	64	467	451	22	595	65		5,796	1,733	290	90			142	.244	.307	.331	.638
9	Browns	.279	1939	43	111	156	5,422	733	1,453	242	50	91	696	558	20	606	48	38	6,132	2,068	383	132			121	.268	.339	.381	.720
10	Red Sox	.279	1932	43	111	154	5,294	566	1,330	253	57	53	529	470	12	537	46	46	5,856	1,856	363	80				.251	.314	.351	.664
11	Phillies	.283	1928	43	109	152	5,234	660	1,396	257	47	85	606	503	21	510	53		5,917	2,002	389	159				.267	.333	.382	.716
12	Orioles	.290	2018	47	115	162	5,507	622	1,317	242	15	188	593	422	57	1,412	81	22	6,034	2,153	445	13	35	19	132	.239	.298	.391	.689
13	Tigers	.292	2019	47	114	161	5,549	582	1,333	292	41	149	556	391	48	1,595	57	20	6,039	2,154	482	9	42	14	108	.240	.294	.388	.682
14	Phillies	.298	1939	45	106	152	5,133	553	1,341	232	40	49	510	421	9	486	47		5,707	1,800	321	144			133	.261	.318	.351	.669
15	Phillies	.299	1945	46	108	154	5,203	548	1,278	197	27	56	503	449	15	501	54		5,738	1,697	280	71			113	.246	.307	.326	.634
16	Browns	.299	1937	46	108	156	5,510	715	1,573	327	44	71	682	514	14	510	30	27	6,123	2,201	442	85				.285	.348	.399	.747
17	Phillies	.300	1938	45	105	151	5,192	550	1,318	233	29	40	503	423	12	507	38		5,713	1,729	302	86			129	.254	.312	.333	.645
18	Red Sox	.301	1926	46	107	154	5,193	561	1,326	248	54	32	525	474	32	441	52	47	5,867	1,778	334	168				.255	.321	.342	.664
19	Phillies	.305	1961	47	107	155	5,213	584	1,265	185	50	103	549	475	46	928	56	30	5,870	1,859	338	108	28	46	130	.243	.310	.357	.667
20	Athletics	.309	2023	50	112	162	5,311	585	1,187	225	21	171	563	498	85	1,496	149	31	5,958	1,967	417	28	36	12	125	.223	.298	.370	.669
21	Mets	.309	1965	50	112	164	5,441	495	1,202	203	27	107	460	392	39	1,129	28	42	5,976	1,780	337	76	28	40	121	.221	.277	.327	.604
22	Red Sox	.309	1925	47	105	152	5,168	640	1,376	257	64	41	591	509	29	421	42	56	5,840	1,884	362	134				.266	.335	.365	.700
23	Athletics	.312	1920	48	106	156	5,263	558	1,325	219	49	44	465	352	45	575	50	67	5,829	1,774	312	169				.252	.304	.337	.641
24	Astros	.315	2013	51	111	162	5,457	610	1,307	266	16	148	566	426	52	1,535	110	61	6,019	2,049	430	46	38	17	110	.240	.299	.375	.674
25	Diamondbacks	.315	2004	51	111	162	5,544	615	1,401	295	38	135	582	441	35	1,022	53	32	6,113	2,177	468	56	37	38	137	.253	.310	.393	.703