The New York Mets had the worst winning percentage by a team in 1965, winning 30.9 percent of the time.

	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	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
2	Athletics	.364	1965	59	103	162	5,393	585	1,294	186	59	110	546	521	35	1,020	110	51	6,058	1,928	355	74	35	29	120	.240	.309	.358	.667
3	Red Sox	.383	1965	62	100	162	5,487	669	1,378	244	40	165	629	607	30	964	47	24	6,220	2,197	449	57	39	44	157	.251	.327	.400	.727
4	Astros	.401	1965	65	97	162	5,483	569	1,299	188	42	97	523	502	46	877	90	37	6,122	1,862	327	57	34	46	125	.237	.305	.340	.644
5	Senators	.432	1965	70	92	162	5,374	591	1,227	179	33	136	563	570	34	1,125	30	19	6,078	1,880	348	63	37	36	112	.228	.304	.350	.654
6	Cubs	.444	1965	72	90	164	5,540	635	1,316	202	33	134	590	532	43	948	65	47	6,205	1,986	369	48	42	62	115	.238	.307	.358	.666
7	Angels	.463	1965	75	87	162	5,354	527	1,279	200	36	92	486	443	22	973	107	57	5,956	1,827	328	93	44	48	99	.239	.297	.341	.639
8	Yankees	.475	1965	77	85	162	5,470	611	1,286	196	31	149	576	489	19	951	35	20	6,081	1,991	376	72	31	62	118	.235	.299	.364	.663
9	Cardinals	.497	1965	80	81	162	5,579	707	1,415	234	46	109	645	477	35	882	100	52	6,204	2,068	389	72	41	49	98	.254	.314	.371	.685
10	Phillies	.528	1965	85	76	162	5,528	654	1,380	205	53	144	608	494	36	1,091	46	32	6,172	2,123	402	75	39	60	115	.250	.313	.384	.697
11	Braves	.531	1965	86	76	162	5,542	708	1,419	243	28	196	664	408	37	976	64	37	6,077	2,306	467	58	32	50	121	.256	.310	.416	.726
12	Indians	.537	1965	87	75	162	5,469	663	1,367	198	21	156	615	506	33	857	109	46	6,138	2,075	375	90	40	63	97	.250	.315	.379	.695
13	Reds	.549	1965	89	73	162	5,658	825	1,544	268	61	183	776	538	50	1,003	82	40	6,355	2,483	512	73	36	89	120	.273	.339	.439	.778
14	Tigers	.549	1965	89	73	162	5,368	680	1,278	190	27	162	634	554	37	952	57	41	6,064	2,008	379	69	36	50	122	.238	.312	.374	.686
15	Pirates	.556	1965	90	72	163	5,686	675	1,506	217	57	111	631	419	35	1,008	51	38	6,249	2,170	385	67	42	75	138	.265	.317	.382	.699
16	Orioles	.580	1965	94	68	162	5,450	641	1,299	227	38	125	596	529	28	907	67	31	6,138	1,977	390	95	36	61	139	.238	.307	.363	.670
17	Giants	.586	1965	95	67	163	5,495	682	1,384	169	43	159	623	476	31	844	47	27	6,119	2,116	371	80	37	68	149	.252	.313	.385	.698
18	White Sox	.586	1965	95	67	162	5,509	647	1,354	200	38	125	587	533	43	916	50	33	6,217	2,005	363	89	43	62	127	.246	.315	.364	.679
19	Dodgers	.599	1965	97	65	162	5,425	608	1,329	193	32	78	548	492	52	891	172	77	6,107	1,820	303	103	35	57	79	.245	.312	.335	.647
20	Twins	.630	1965	102	60	162	5,488	774	1,396	257	42	150	711	554	35	969	92	33	6,213	2,187	449	77	59	79	93	.254	.324	.399	.722