All-Time MLB Player Pitching Stat Leaders by Season

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PLAYER	YEAR	TEAM	W	L	ERA	G	GS	CG	SHO	SV	SVO	IP	H	R	ER	HR	HB	BB	SO	WHIP	AVG
1 Old HossO RadbournRadbourn P 1 ‌ ‌ ‌	1884	PRO	59	12	1.38	75	73	73	11	1	--	678.2	528	216	104	18		98	441	0.92	--
2 CharlieC BuffintonBuffinton P 2 ‌ ‌ ‌	1884	BSN	48	16	2.15	67	67	63	8	0	--	587.0	506	225	140	15		76	417	0.99	--
3 SandyS KoufaxKoufax P 3 ‌ ‌ ‌	1965	LA	26	8	2.04	43	41	27	8	2	--	335.2	216	90	76	26	5	71	382	0.86	.179
4 RandyR JohnsonJohnson P 4 ‌ ‌ ‌	2001	AZ	21	6	2.49	35	34	3	2	0	0	249.2	181	74	69	19	18	71	372	1.01	.203
5 PudP GalvinGalvin P 5 ‌ ‌ ‌	1884	BUF	46	22	1.99	72	72	71	12	0	--	636.1	566	254	141	23		63	369	0.99	--
6 RandyR JohnsonJohnson P 6 ‌ ‌ ‌	1999	AZ	17	9	2.48	35	35	12	2	0	0	271.2	207	86	75	30	9	70	364	1.02	.208
7 RandyR JohnsonJohnson P 7 ‌ ‌ ‌	2000	AZ	19	7	2.64	35	35	8	3	0	0	248.2	202	89	73	23	6	76	347	1.12	.224
8 JimJ WhitneyWhitney P 8 ‌ ‌ ‌	1883	BSN	37	21	2.24	62	56	54	1	2	--	514.0	492	258	128	7		35	345	1.03	--
8 MickeyM WelchWelch P 8 ‌ ‌ ‌	1884	NYG	39	21	2.50	65	65	62	4	0	--	557.1	528	275	155	12		146	345	1.21	--
10 AmosA RusieRusie P 10 ‌ ‌ ‌	1890	NYG	29	34	2.56	67	62	56	4	1	--	548.2	436	300	156	3	26	289	341	1.32	.212
11 AmosA RusieRusie P 11 ‌ ‌ ‌	1891	NYG	33	20	2.55	61	57	52	6	1	--	500.1	391	244	142	6	18	262	337	1.31	.207
12 TimT KeefeKeefe P 12 ‌ ‌ ‌	1888	NYG	35	12	1.74	51	51	48	8	0	--	434.1	317	140	84	5	12	90	335	0.94	.196
13 RandyR JohnsonJohnson P 13 ‌ ‌ ‌	2002	AZ	24	5	2.32	35	35	8	4	0	0	260.0	197	78	67	26	13	71	334	1.03	.208
14 LadyL BaldwinBaldwin P 14 ‌ ‌ ‌	1886	DET	42	13	2.24	56	56	55	7	0	--	487.0	371	194	121	11		100	323	0.97	--
15 CurtC SchillingSchilling P 15 ‌ ‌ ‌	1997	PHI	17	11	2.97	35	35	7	2	0	0	254.1	208	96	84	25	5	58	319	1.05	.224
16 SandyS KoufaxKoufax P 16 ‌ ‌ ‌	1966	LA	27	9	1.73	41	41	27	5	0	--	323.0	241	74	62	19	0	77	317	0.98	.205
17 CurtC SchillingSchilling P 17 ‌ ‌ ‌	2002	AZ	23	7	3.23	36	35	5	1	0	0	259.1	218	95	93	29	3	33	316	0.97	.224
18 Old HossO RadbournRadbourn P 18 ‌ ‌ ‌	1883	PRO	48	25	2.05	76	68	66	4	1	--	632.1	563	275	144	7		56	315	0.98	--
19 WilliamW HutchinsonHutchinson P 19 ‌ ‌ ‌	1892	CHI	36	36	2.76	75	70	67	5	1	--	622.0	571	316	191	11	13	190	314	1.22	.234
20 JohnJ ClarksonClarkson P 20 ‌ ‌ ‌	1886	CHI	36	17	2.41	55	55	50	3	0	--	466.2	419	248	125	20		86	313	1.08	--
20 J.R.J RichardRichard P 20 ‌ ‌ ‌	1979	HOU	18	13	2.71	38	38	19	4	0	0	292.1	220	98	88	13	3	98	313	1.09	.209
22 SteveS CarltonCarlton P 22 ‌ ‌ ‌	1972	PHI	27	10	1.97	41	41	30	8	0	0	346.1	257	84	76	17	1	87	310	0.99	.206
23 JohnJ ClarksonClarkson P 23 ‌ ‌ ‌	1885	CHI	53	16	1.85	70	70	68	10	0	--	623.0	497	255	128	21		97	308	0.95	--
24 MikeM ScottScott P 24 ‌ ‌ ‌	1986	HOU	18	10	2.22	37	37	7	5	0	0	275.1	182	73	68	17	2	72	306	0.92	.186
24 SandyS KoufaxKoufax P 24 ‌ ‌ ‌	1963	LA	25	5	1.88	40	40	20	11	0	--	311.0	214	68	65	18	3	58	306	0.87	.189

Data validation provided by Elias Sports Bureau, the Official Statistician of Major League Baseball