Willie Keeler has the lowest strikeout percentage with 600+ plate appearances in a season, with a strikeout percentage of 0.3 in 1899.

Interpreted as:

lowest k% by a player in a season min 600 pa

	NAME	SO%	PA	SEASON	TM	G	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	TB	XBH	SH	GIDP	AVG	OBP	SLG	OPS	WRC	WRAA	WOBA	WRC+	BRAA
1	Willie Keeler W. Keeler	0.3	633	1899	BKN	141	570	140	216	12	13	1	61	37	9	2	45		257	26	17		.379	.425	.451	.876	126	39.1	.420	136	33.5
2	Joe Sewell J. Sewell	0.6	699	1925	CLE	155	608	78	204	37	7	1	98	64	4	4	7	6	258	45	23		.336	.402	.424	.827	111	19.1	.387	112	11.8
3	Joe Sewell J. Sewell	0.6	672	1929	CLE	152	578	90	182	38	3	7	73	48	5	4	6	6	247	48	41		.315	.372	.427	.800	97	8.5	.368	103	3.2
4	Willie Keeler W. Keeler	0.6	619	1900	BKN	136	563	106	204	13	12	4	68	30	7	4	41		253	29	19		.362	.402	.449	.851	116	31.9	.404	130	26.4
5	Joe Sewell J. Sewell	0.7	606	1933	NYY	135	524	87	143	18	1	2	54	71	1	4	2	2	169	21	10		.273	.361	.323	.683	70	-0.2	.330	92	-6.4
6	Willie Keeler W. Keeler	0.7	604	1898	BAL	129	561	126	216	7	2	1	44	31	3	4	28		230	10	9		.385	.420	.410	.830	112	33	.406	135	29
7	Charlie Hollocher C. Hollocher	0.7	692	1922	CHC	152	592	90	201	37	8	3	69	58	5	5	19	29	263	48	37		.340	.403	.444	.847	112	25.6	.394	119	18.1
8	Willie Keeler W. Keeler	0.7	672	1906	NYH	152	592	96	180	8	3	2	33	40	5	5	23		200	13	35		.304	.353	.338	.691	81	14.7	.340	108	5.9
9	Willie Keeler W. Keeler	0.8	645	1901	BKN	136	595	123	202	18	12	2	43	21	7	5	23		250	32	22		.339	.369	.420	.789	106	22.3	.371	123	19.5
10	John Ward J. Ward	0.8	636	1893	NYG	135	588	129	193	27	9	2	77	47	1	5	46		244	38			.328	.379	.415	.794	117	13.7	.381	111	12.3
11	Willie Keeler W. Keeler	0.8	618	1897	BAL	129	564	145	239	27	19	0	74	35	7	5	64		304	46	12		.424	.464	.539	1.003	155	61.5	.470	159	57.2
12	Joe Sewell J. Sewell	0.9	672	1926	CLE	154	578	91	187	41	5	4	84	65	8	6	17	7	250	50	21		.324	.399	.433	.832	105	24.6	.391	117	15.5
13	Willie Keeler W. Keeler	0.9	664	1894	BAL	129	590	165	219	27	22	5	94	40	18	6	32		305	54	16		.371	.427	.517	.944	156	36.1	.433	123	28.3
14	Stuffy McInnis S. McInnis	1.0	611	1924	BSN	146	581	57	169	23	7	1	59	15	2	6	9	3	209	31	13		.291	.311	.360	.671	58	-17.3	.312	81	-14.3
15	Sam Dungan S. Dungan	1.0	610	1901	WSH	138	559	70	179	26	12	1	73	40	2	6	9		232	39	9		.320	.368	.415	.783	99	20	.369	112	10.8
16	John Ward J. Ward	1.0	605	1894	NYG	138	549	102	146	12	5	0	79	35	1	6	39		168	17	20		.266	.311	.306	.617	61	-48.9	.299	55	-51.6
17	Joe Sewell J. Sewell	1.1	652	1927	CLE	153	569	83	180	48	5	1	92	51	9	7	3	16	241	54	23		.316	.382	.424	.805	96	16.3	.377	109	7.5
18	Joe Quinn J. Quinn	1.2	602	1895	STL	135	547	86	172	19	9	3	76	37	2	7	22		218	31	16		.314	.360	.399	.759	98	-1.1	.359	96	-4
19	Lave Cross L. Cross	1.2	646	1898	STL	151	602	71	191	28	8	3	79	28	0	8	14		244	39	16		.317	.348	.405	.753	98	13.4	.361	110	9.1
20	Tommy Holmes T. Holmes	1.3	713	1945	BSN	154	636	125	224	47	6	28	117	70	4	9	15		367	81	3	11	.352	.420	.577	.997	146	69.1	.463	171	60.8
21	Eddie Collins E. Collins	1.3	632	1923	CWS	145	505	89	182	22	5	5	67	84	4	8	48	29	229	32	39		.360	.455	.453	.909	120	42	.430	145	37.3
22	Steve Brodie S. Brodie	1.3	628	1894	BAL	129	573	134	210	25	11	3	113	18	13	8	42		266	39	24		.366	.399	.464	.863	127	13.5	.400	105	6.2
23	Sam Rice S. Rice	1.3	694	1929	WSH	150	616	119	199	39	10	1	62	55	4	9	16	8	261	50	19		.323	.382	.424	.806	103	11.1	.372	110	9.3
24	Mickey Cochrane M. Cochrane	1.3	606	1929	PHA	135	514	113	170	37	8	7	95	69	2	8	7	7	244	52	21		.331	.412	.475	.887	107	27.1	.406	130	24.7
25	Joe Sewell J. Sewell	1.3	678	1928	CLE	155	588	79	190	40	2	4	70	58	7	9	7	1	246	46	25		.323	.391	.418	.809	101	18.4	.378	114	12.2