which left handed pitcher has the most strikeouts in a season

Matt Kilroy has struck out the most batters by a left-hander in a season, with 513 strikeouts in his rookie season in 1886.

	NAME	SO	SEASON	TM	G	W	L	W%	GS	ERA	CG	SHO	SV	IP	H	ER	R	HR	BB	HBP	GF	IBB	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	ERA-	FIP	FIP-	H/9	PRAA
1	Matt Kilroy M. Kilroy	513	1886	BAL	68	29	34	.460	68	3.37	66	5	0	583.0	476	218	350	10	182	19	0		2,469	61	7.92	2.81	2.82	0.15	20.8	7.4	1.13	.267	5.40	100	2.60	77	7.35	47
2	Toad Ramsey T. Ramsey	499	1886	LOU	67	38	27	.585	67	2.45	66	3	0	588.2	447	160	297	3	207	12	0		2,477	35	7.63	3.16	2.41	0.05	20.1	8.4	1.11	.253	4.54	71	2.59	76	6.83	54.7
3	Dupee Shaw D. Shaw	451	1884	TOT	67	30	33	.476	66	2.30	60	5	0	543.1	446	139	281	9	109		1		2,244	24	7.47	1.81	4.14	0.15	20.1	4.9	1.02		4.65	77	2.43	81	7.39	29
4	Sandy Koufax S. Koufax	382	1965	LAD	43	26	8	.765	41	2.04	27	8	2	335.2	216	76	90	26	71	5	2	4	1,297	11	10.24	1.90	5.38	0.70	29.5	5.5	0.86	.234	2.41	63	1.93	61	5.79	47.9
5	Randy Johnson R. Johnson	372	2001	ARI	35	21	6	.778	34	2.49	3	2	0	249.2	181	69	74	19	71	18	1	2	994	8	13.41	2.56	5.24	0.68	37.4	7.1	1.01	.315	2.67	55	2.12	48	6.52	63.9
6	Randy Johnson R. Johnson	364	1999	ARI	35	17	9	.654	35	2.48	12	2	0	271.2	207	75	86	30	70	9	0	3	1,079	4	12.06	2.32	5.20	0.99	33.7	6.5	1.02	.292	2.85	53	2.75	59	6.86	57.2
7	Toad Ramsey T. Ramsey	355	1887	LOU	65	37	27	.578	64	3.43	61	0	0	561.0	544	214	358	9	167	16	1		2,430	46	5.70	2.68	2.13	0.14	14.6	6.9	1.27	.284	5.74	78	3.20	76	8.73	64.2
8	Rube Waddell R. Waddell	349	1904	PHA	46	25	19	.568	46	1.62	39	8	0	383.0	307	69	109	5	91	14	0		1,496	8	8.20	2.14	3.84	0.12	23.3	6.1	1.04	.291	2.56	61	1.59	62	7.21	41.5
9	Randy Johnson R. Johnson	347	2000	ARI	35	19	7	.731	35	2.64	8	3	0	248.2	202	73	89	23	76	6	0	1	1,001	5	12.56	2.75	4.57	0.83	34.7	7.6	1.12	.326	3.22	56	2.53	53	7.31	61.1
10	Randy Johnson R. Johnson	334	2002	ARI	35	24	5	.828	35	2.32	8	4	0	260.0	197	67	78	26	71	13	0	1	1,035	3	11.56	2.46	4.70	0.90	32.3	6.9	1.03	.289	2.70	54	2.65	61	6.82	47
11	Randy Johnson R. Johnson	329	1998	TOT	34	19	11	.633	34	3.28	10	6	0	244.1	203	89	102	23	86	14	0	1	1,014	7	12.12	3.17	3.83	0.85	32.4	8.5	1.18	.320	3.76	72	2.89	65	7.48	42.2
12	Ed Morris E. Morris	326	1886	PIT	64	41	20	.672	63	2.45	63	12	1	555.1	455	151	244	5	118	7	1		2,252	22	5.28	1.91	2.76	0.08	14.5	5.2	1.03	.251	3.95	76	2.72	85	7.37	23.7
13	Sam McDowell S. McDowell	325	1965	CLE	42	17	11	.607	35	2.18	14	3	4	273.0	178	66	80	9	132	6	5	7	1,116	17	10.71	4.35	2.46	0.30	29.1	11.8	1.14	.262	2.64	63	2.08	58	5.87	45.4
14	Lady Baldwin L. Baldwin	323	1886	DET	56	42	13	.764	56	2.24	55	7	0	487.0	371	121	194	11	100		0		1,936	22	5.97	1.85	3.23	0.20	16.7	5.2	0.97		3.59	68	2.68	81	6.86	33.8
15	Sandy Koufax S. Koufax	317	1966	LAD	41	27	9	.750	41	1.73	27	5	0	323.0	241	62	74	19	77	0	0	4	1,274	7	8.83	2.15	4.12	0.53	24.9	6.0	0.98	.258	2.06	53	2.07	65	6.72	41.8
16	Steve Carlton S. Carlton	310	1972	PHI	41	27	10	.730	41	1.97	30	8	0	346.1	257	76	84	17	87	1	0	8	1,351	8	8.06	2.26	3.56	0.44	22.9	6.4	0.99	.256	2.18	56	2.00	59	6.68	53.5
17	Chris Sale C. Sale	308	2017	BOS	32	17	8	.680	32	2.90	1	0	0	214.1	165	69	73	24	43	8	0	0	851	3	12.93	1.81	7.16	1.01	36.2	5.1	0.97	.301	3.07	63	2.45	56	6.93	45.5
18	Randy Johnson R. Johnson	308	1993	SEA	35	19	8	.704	34	3.24	10	3	1	255.1	185	92	97	22	99	16	1	1	1,043	8	10.86	3.49	3.11	0.78	29.5	9.5	1.11	.273	3.42	74	3.04	70	6.52	36.2
19	Mickey Lolich M. Lolich	308	1971	DET	45	25	14	.641	45	2.92	29	4	0	376.0	336	122	133	36	92	7	0	2	1,538	7	7.37	2.20	3.35	0.86	20.0	6.0	1.14	.274	3.18	83	2.84	78	8.04	32.5
20	Sandy Koufax S. Koufax	306	1963	LAD	40	25	5	.833	40	1.88	20	11	0	311.0	214	65	68	18	58	3	0	7	1,210	6	8.86	1.68	5.28	0.52	25.3	4.8	0.87	.238	1.97	62	1.85	62	6.19	41.9
21	Sam McDowell S. McDowell	304	1970	CLE	39	20	12	.625	39	2.92	19	1	0	305.0	236	99	108	25	131	7	2	10	1,257	17	8.97	3.87	2.32	0.74	24.2	10.4	1.20	.267	3.19	76	3.06	75	6.96	33.8
22	Rube Waddell R. Waddell	302	1903	PHA	39	21	16	.568	38	2.44	34	4	0	324.0	274	88	109	3	85	8	1		1,291	9	8.39	2.36	3.55	0.08	23.4	6.6	1.11	.303	3.03	80	1.87	62	7.61	41.9
23	Ed Morris E. Morris	302	1884	COL	52	34	13	.723	52	2.18	47	3	0	429.2	335	104	159	3	51	13	0		1,703	22	6.33	1.07	5.92	0.06	17.7	3.0	0.90	.249	3.33	71	2.41	80	7.02	23.3
24	Clayton Kershaw C. Kershaw	301	2015	LAD	33	16	7	.696	33	2.13	4	3	0	232.2	163	55	62	15	42	5	0	1	890	9	11.64	1.62	7.17	0.58	33.8	4.7	0.88	.281	2.40	57	1.98	52	6.31	47.7
25	Vida Blue V. Blue	301	1971	OAK	39	24	8	.750	39	1.82	24	8	0	312.0	209	63	73	19	88	4	0	3	1,207	10	8.68	2.54	3.42	0.55	24.9	7.3	0.95	.239	2.11	56	2.19	66	6.03	41.4