The Oakland Athletics had their worst losing percentage in a season in 2023, losing 69.1 percent of the time.

	TEAM	L%	SEASON	W	L	G	W%	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS
1	Athletics	.691	2023	50	112	162	.309	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
2	Athletics	.667	1979	54	108	162	.333	5,348	573	1,276	188	32	108	541	482	20	751	104	69	5,971	1,852	328	75	46	36	131	.239	.302	.346	.648
3	Athletics	.630	2022	60	102	162	.370	5,314	568	1,147	249	15	137	537	433	59	1,389	78	23	5,861	1,837	401	22	33	7	109	.216	.281	.346	.626
4	Athletics	.609	1977	63	98	161	.391	5,358	605	1,284	176	37	117	548	516	36	910	176	89	6,020	1,885	330	64	46	37	111	.240	.308	.352	.660
5	Athletics	.599	1997	65	97	162	.401	5,589	764	1,451	274	23	197	714	642	49	1,181	71	36	6,369	2,362	494	49	40	23	133	.260	.339	.423	.762
6	Athletics	.580	2015	68	94	162	.420	5,600	694	1,405	277	46	146	661	475	40	1,119	78	29	6,167	2,212	469	14	38	21	124	.251	.312	.395	.707
7	Athletics	.580	1993	68	94	162	.420	5,543	715	1,408	260	21	158	679	622	33	1,048	131	59	6,293	2,184	439	46	49	45	125	.254	.330	.394	.724
8	Athletics	.580	1982	68	94	162	.420	5,448	691	1,286	211	27	149	659	582	20	948	232	87	6,154	1,998	387	50	54	20	95	.236	.309	.367	.676
9	Athletics	.574	2024	69	93	162	.426	5,432	643	1,267	240	19	196	619	493	53	1,502	98	26	6,034	2,133	455	19	37	11	105	.233	.301	.393	.694
10	Athletics	.574	2016	69	93	162	.426	5,500	653	1,352	270	21	169	634	442	33	1,145	50	23	6,022	2,171	460	13	34	19	142	.246	.304	.395	.699
11	Athletics	.574	1978	69	93	162	.426	5,321	532	1,304	200	31	100	492	433	25	800	144	117	5,914	1,866	331	108	27	33	106	.245	.303	.351	.654
12	Athletics	.553	1994	51	63	114	.447	3,885	549	1,009	178	13	113	515	417	18	686	91	39	4,395	1,552	304	24	51	21	79	.260	.330	.399	.730
13	Athletics	.543	2011	74	88	162	.457	5,452	645	1,330	280	29	114	612	509	50	1,094	117	43	6,102	2,010	423	34	57	20	119	.244	.311	.369	.680
14	Athletics	.543	1998	74	88	162	.457	5,490	804	1,413	295	13	149	755	633	55	1,122	131	47	6,282	2,181	457	58	46	22	120	.257	.338	.397	.735
15	Athletics	.543	1983	74	88	162	.457	5,516	708	1,447	237	28	121	662	524	31	872	235	98	6,188	2,103	386	55	62	47	128	.262	.326	.381	.708
16	Athletics	.537	2017	75	87	162	.463	5,464	739	1,344	305	15	234	708	565	43	1,491	57	22	6,125	2,381	554	13	40	15	129	.246	.319	.436	.755
17	Athletics	.537	2009	75	87	162	.463	5,584	759	1,464	307	21	135	723	527	50	1,046	133	48	6,246	2,218	463	31	54	16	130	.262	.328	.397	.726
18	Athletics	.535	1995	67	77	144	.465	4,916	730	1,296	228	18	169	694	565	45	911	112	46	5,616	2,067	415	32	58	25	108	.264	.341	.420	.762
19	Athletics	.534	2008	75	86	161	.466	5,451	646	1,318	270	23	125	610	574	48	1,226	88	21	6,138	2,009	418	30	35	23	126	.242	.318	.369	.686
20	Athletics	.531	2007	76	86	162	.469	5,577	741	1,430	295	16	171	711	664	49	1,119	52	20	6,364	2,270	482	18	56	29	142	.256	.338	.407	.745
21	Athletics	.531	1986	76	86	162	.469	5,435	731	1,370	213	25	163	683	553	32	983	139	61	6,127	2,122	401	56	51	24	105	.252	.322	.390	.712
22	Athletics	.525	1985	77	85	162	.475	5,581	757	1,475	230	34	155	690	508	16	861	117	58	6,215	2,238	419	63	47	29	128	.264	.325	.401	.726
23	Athletics	.525	1984	77	85	162	.475	5,457	738	1,415	257	29	158	697	568	22	871	145	64	6,161	2,204	444	37	77	29	116	.259	.327	.404	.731
24	Athletics	.519	1996	78	84	162	.481	5,630	861	1,492	283	21	243	823	640	58	1,114	58	35	6,402	2,546	547	35	39	36	134	.265	.344	.452	.796
25	Athletics	.500	2010	81	81	162	.500	5,448	663	1,396	276	30	109	619	527	47	1,061	156	38	6,116	2,059	415	43	51	16	129	.256	.324	.378	.702