The Philadelphia Athletics had the highest winning percentage by a team in 1929, winning 69.3 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	.693	1929	104	46	151	5,204	901	1,537	288	75	122	845	540	29	440	63	42	5,987	2,341	485	214	.295	.365	.450	.815
2	Cubs	.645	1929	98	54	156	5,471	982	1,655	310	46	139	933	589	29	567	103		6,252	2,474	495	163	.303	.373	.452	.825
3	Pirates	.575	1929	88	65	154	5,490	904	1,663	285	116	60	828	503	29	335	94		6,198	2,360	461	176	.303	.364	.430	.794
4	Yankees	.571	1929	88	66	154	5,376	899	1,589	264	74	142	827	555	23	502	53	52	6,100	2,427	480	146	.296	.364	.451	.815
5	Giants	.556	1929	84	67	152	5,388	897	1,594	251	47	136	829	482	36	405	85		6,060	2,347	434	154	.296	.358	.436	.793
6	Indians	.533	1929	81	71	152	5,191	717	1,521	290	79	62	682	447	26	348	75	86	5,873	2,155	431	209	.293	.352	.415	.767
7	Browns	.520	1929	79	73	154	5,175	733	1,427	278	64	46	672	584	25	423	70	48	5,974	1,971	388	190	.276	.352	.381	.733
8	Cardinals	.513	1929	78	74	154	5,364	831	1,569	310	84	100	779	490	22	455	72		6,030	2,347	494	154	.293	.354	.438	.792
9	Senators	.467	1929	71	81	153	5,237	732	1,445	244	66	48	656	554	19	397	90	63	5,997	1,965	358	187	.276	.347	.375	.723
10	Phillies	.464	1929	71	82	154	5,484	897	1,693	305	51	153	841	573	24	470	59		6,216	2,559	509	135	.309	.377	.467	.843
11	Robins	.458	1929	70	83	153	5,273	755	1,535	282	69	99	705	504	22	454	80		5,954	2,252	450	155	.291	.355	.427	.782
12	Tigers	.455	1929	70	84	155	5,593	926	1,672	337	96	110	851	515	20	493	95	77	6,252	2,531	543	124	.299	.360	.453	.813
13	Reds	.429	1929	66	88	155	5,269	686	1,478	258	79	34	618	412	26	347	134		5,882	1,996	371	175	.281	.336	.379	.715
14	White Sox	.388	1929	59	93	152	5,246	626	1,406	241	74	37	568	421	21	420	109	61	5,845	1,906	352	157	.268	.325	.363	.688
15	Red Sox	.377	1929	58	96	155	5,158	605	1,377	287	69	28	561	415	29	494	87	80	5,779	1,886	384	177	.267	.325	.366	.691
16	Braves	.364	1929	56	98	154	5,291	657	1,481	252	77	33	598	408	27	432	65		5,923	1,986	362	197	.280	.335	.375	.710