The Chicago White Stockings had their highest winning percentage in a season in 1880, winning 79.8 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	White Stockings	.798	1880	67	17	86	3,135	538	876	164	39	4	378	104		217			3,239	1,130	207					.279		.360
2	White Stockings	.788	1876	52	14	66	2,748	624	926	131	32	8	441	70		45			2,818	1,145	171					.337		.417
3	White Stockings	.777	1885	87	25	113	4,093	834	1,079	184	75	54	606	340		429			4,433	1,575	313					.264		.385
4	Cubs	.763	1906	116	36	155	5,018	704	1,316	181	71	20	539	448	45	516	283		5,742	1,699	272	231				.262	.328	.339	.667
5	White Stockings	.726	1886	90	34	126	4,378	900	1,223	198	87	53	673	460		513	213		4,838	1,754	338					.279		.401
6	Cubs	.704	1907	107	45	155	4,892	571	1,224	162	48	13	450	435	48	449	235		5,570	1,521	223	195				.250	.318	.311	.628
7	Cubs	.680	1909	104	49	155	4,999	632	1,227	203	60	20	496	420	31	553	187		5,696	1,610	283	246				.245	.308	.322	.630
8	Cubs	.675	1910	104	50	154	4,977	711	1,333	219	84	34	586	542	39	501	173		5,792	1,822	337	234				.268	.344	.366	.710
9	White Stockings	.667	1881	56	28	84	3,114	550	918	157	36	12	400	140		224			3,254	1,183	205					.295		.380
10	White Stockings	.655	1882	55	29	84	3,225	604	892	209	54	15	451	142		262			3,367	1,254	278					.277		.389
11	Cubs	.651	1918	84	45	131	4,325	538	1,147	164	53	21	438	358	27	343	159		4,900	1,480	238	190				.265	.325	.342	.667
12	Cubs	.649	1935	100	54	154	5,486	847	1,581	303	62	88	782	464	33	471	66		6,133	2,272	453	150			115	.288	.347	.414	.761
13	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
14	Cubs	.643	1908	99	55	158	5,085	625	1,267	196	56	19	492	418	40	520	212		5,813	1,632	271	270				.249	.311	.321	.632
15	Cubs	.640	2016	103	58	162	5,503	808	1,409	293	30	199	767	656	96	1,339	66	34	6,334	2,359	522	42	37	45	107	.256	.343	.429	.772
16	Cubs	.636	1945	98	56	155	5,298	735	1,465	229	52	57	674	555	32	462	69		6,035	1,969	338	150			93	.277	.349	.372	.720
17	Colts	.610	1890	83	53	139	4,891	847	1,271	147	60	67	653	516	46	514	329		5,453	1,739	274					.260	.336	.356	.692
18	Cubs	.608	1904	93	60	156	5,210	597	1,294	157	62	22	470	298	48	470	227		5,695	1,641	241	139				.248	.295	.315	.610
19	Colts	.607	1891	82	53	137	4,873	832	1,231	159	88	60	684	526	50	457	238		5,449	1,746	307					.253	.332	.358	.690
20	Cubs	.607	1912	91	59	152	5,048	756	1,398	245	91	42	656	560	40	615	164		5,830	1,951	378	182				.277	.354	.386	.740
21	Cubs	.604	1937	93	61	154	5,349	811	1,537	253	74	96	762	538	22	496	71		6,028	2,226	423	119			120	.287	.355	.416	.771
22	Cubs	.602	2008	97	64	161	5,588	855	1,552	329	21	184	811	636	50	1,186	87	34	6,384	2,475	534	65	45	48	134	.278	.354	.443	.797
23	White Stockings	.602	1883	59	39	98	3,658	679	1,000	277	61	13	467	129		399			3,787	1,438	351					.273		.393
24	Cubs	.601	1905	92	61	155	5,108	667	1,249	157	82	12	522	448	61	511	267		5,810	1,606	251	193				.245	.313	.314	.627
25	Cubs	.599	2015	97	65	162	5,491	689	1,341	272	30	171	657	567	74	1,518	95	37	6,199	2,186	473	32	35	47	101	.244	.321	.398	.719