The Philadelphia Athletics had the lowest winning percentage by a team in 1920, winning 31.2 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	AVG	OBP	SLG	OPS
1	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
2	Tigers	.396	1920	61	93	155	5,212	652	1,406	228	72	30	561	485	20	389	76	68	5,933	1,868	330	216	.270	.334	.358	.693
3	Phillies	.405	1920	62	91	153	5,264	565	1,385	229	54	64	483	283	36	531	100	83	5,742	1,914	347	159	.263	.305	.364	.669
4	Braves	.408	1920	62	90	153	5,218	523	1,358	168	86	23	456	385	33	488	88	98	5,802	1,767	277	166	.260	.315	.339	.654
5	Senators	.447	1920	68	84	153	5,252	724	1,525	232	81	36	616	435	54	538	160	110	5,940	2,027	349	199	.290	.351	.386	.737
6	Red Sox	.471	1920	72	81	154	5,189	650	1,397	216	71	22	569	527	45	428	98	110	5,980	1,821	309	219	.269	.342	.351	.693
7	Cubs	.487	1920	75	79	154	5,117	619	1,350	223	67	34	535	428	46	421	115	129	5,811	1,809	324	220	.264	.326	.354	.680
8	Cardinals	.487	1920	75	79	155	5,495	675	1,589	238	96	32	600	373	26	484	126	114	6,086	2,115	366	192	.289	.337	.385	.722
9	Browns	.497	1920	76	77	154	5,359	797	1,650	278	84	50	707	425	38	338	121	78	6,029	2,246	412	207	.308	.363	.419	.782
10	Pirates	.513	1920	79	75	155	5,219	530	1,342	162	90	16	449	374	29	405	181	117	5,796	1,732	268	174	.257	.310	.332	.642
11	Reds	.536	1920	82	71	154	5,176	639	1,432	169	76	18	546	382	47	367	158	128	5,799	1,807	263	194	.277	.332	.349	.681
12	Giants	.558	1920	86	68	155	5,309	682	1,427	210	76	46	590	432	26	545	131	113	5,891	1,927	332	124	.269	.327	.363	.690
13	Robins	.604	1920	93	61	155	5,399	660	1,493	205	99	28	566	359	19	391	70	80	5,966	1,980	332	189	.277	.324	.367	.691
14	Yankees	.617	1920	95	59	154	5,174	837	1,447	268	71	115	751	532	23	621	64	81	5,901	2,202	454	172	.280	.349	.426	.775
15	White Sox	.623	1920	96	58	154	5,330	794	1,574	263	98	37	694	474	38	350	109	94	6,030	2,144	398	188	.295	.357	.402	.759
16	Indians	.636	1920	98	56	154	5,203	856	1,575	301	95	35	757	574	36	376	73	93	6,067	2,171	431	254	.303	.376	.417	.793