best start to a regular season without a loss for a pitcher

Roger Clemens has the most career starts in wins, with 523 starts.

	NAME	GS	L	W	L%	G	W%	ERA	SO	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	H/9
1	Roger Clemens R. Clemens	523	0	354	.000	525	1.000	2.31	3,641	92	46	0	3767.2	2,888	966	1,052	208	1,084	108	0	25	15,042	106	8.70	2.59	3.36	0.50	24.2	7.2	1.05	.268	2.51	6.90
2	Greg Maddux G. Maddux	514	0	355	.000	517	1.000	2.21	2,454	92	35	0	3635.2	3,027	892	998	194	630	82	2	78	14,293	48	6.07	1.56	3.90	0.48	17.2	4.4	1.01	.259	2.47	7.49
3	Don Sutton D. Sutton	503	0	324	.000	518	1.000	2.28	2,549	151	58	5	3767.0	2,920	954	1,047	275	873	45	10	46	14,891	69	6.09	2.09	2.92	0.66	17.1	5.9	1.01	.237	2.50	6.98
4	Nolan Ryan N. Ryan	482	0	324	.000	515	1.000	2.01	3,886	163	61	3	3610.2	2,233	807	923	147	1,670	93	12	29	14,520	142	9.69	4.16	2.33	0.37	26.8	11.5	1.08	.239	2.30	5.57
5	Tom Glavine T. Glavine	479	0	305	.000	479	1.000	2.51	1,937	50	25	0	3276.0	2,844	913	1,013	205	987	41	0	80	13,287	39	5.32	2.71	1.96	0.56	14.6	7.4	1.17	.261	2.78	7.81
6	Tommy John T. John	472	0	288	.000	529	1.000	2.46	1,645	129	46	3	3433.1	3,122	937	1,067	174	814	67	22	48	13,859	108	4.31	2.13	2.02	0.46	11.9	5.9	1.15	.264	2.80	8.18
7	Steve Carlton S. Carlton	469	0	329	.000	497	1.000	2.37	2,968	216	55	2	3700.1	2,972	974	1,098	235	1,155	36	12	66	14,872	126	7.22	2.81	2.57	0.57	20.0	7.8	1.12	.261	2.67	7.23
8	Phil Niekro P. Niekro	454	0	318	.000	590	1.000	2.43	2,288	182	45	29	3706.0	3,068	999	1,165	260	1,172	85	76	32	15,076	135	5.56	2.85	1.95	0.63	15.2	7.8	1.14	.249	2.83	7.45
9	Tom Seaver T. Seaver	444	0	311	.000	451	1.000	2.10	2,687	186	61	1	3489.1	2,585	814	882	222	925	41	4	58	13,719	74	6.93	2.39	2.90	0.57	19.6	6.7	1.01	.240	2.27	6.67
10	Gaylord Perry G. Perry	438	0	314	.000	512	1.000	2.12	2,418	227	53	10	3671.2	2,976	866	1,014	195	856	62	24	64	14,555	93	5.93	2.10	2.82	0.48	16.6	5.9	1.04	.252	2.49	7.29
11	Warren Spahn W. Spahn	438	0	363	.000	505	1.000	2.24	1,837	324	63	28	3738.2	3,082	929	1,047	249	931	24	52	25	14,892	48	4.42	2.24	1.97	0.60	12.3	6.3	1.07	.239	2.52	7.42
12	Randy Johnson R. Johnson	437	0	303	.000	452	1.000	2.41	3,775	75	37	2	3138.2	2,282	841	929	243	990	130	7	17	12,544	67	10.82	2.84	3.81	0.70	30.1	7.9	1.04	.275	2.66	6.54
13	Bert Blyleven B. Blyleven	437	0	287	.000	442	1.000	2.29	2,538	167	60	0	3339.1	2,742	851	956	216	843	83	1	30	13,336	67	6.84	2.27	3.01	0.58	19.0	6.3	1.07	.262	2.58	7.39
14	Jamie Moyer J. Moyer	432	0	269	.000	487	1.000	3.24	1,757	24	10	0	2918.0	2,726	1,052	1,121	296	758	95	13	38	12,061	34	5.42	2.34	2.32	0.91	14.6	6.3	1.19	.265	3.46	8.41
15	Walter Johnson W. Johnson	417	0	417	.000	523	1.000	1.22	2,413	344	110	34	3871.2	2,800		816	49	824	116	100		14,974	84	5.61	1.92	2.93	0.11	16.1	5.5	0.94	.238	1.90	6.51
16	Jim Kaat J. Kaat	408	0	283	.000	661	1.000	2.71	1,801	147	31	17	3282.1	3,100	989	1,151	236	711	71	92	73	13,422	87	4.94	1.95	2.53	0.65	13.4	5.3	1.16	.270	3.16	8.50
17	Grover Alexander G. Alexander	407	0	373	.000	488	1.000	1.74	1,615	342	90	33	3710.1	3,098		964	101	635	34	70		14,553	22	3.92	1.54	2.54	0.24	11.1	4.4	1.01	.246	2.34	7.51
18	CC Sabathia	399	0	251	.000	400	1.000	2.77	2,326	28	12	0	2631.0	2,197	809	880	222	766	80	0	19	10,665	49	7.96	2.62	3.04	0.76	21.8	7.2	1.13	.272	3.01	7.52
19	Zack Greinke Z. Greinke	388	0	225	.000	430	1.000	2.42	2,313	10	5	1	2553.1	2,146	687	745	196	512	53	7	14	10,098	69	8.15	1.80	4.52	0.69	22.9	5.1	1.04	.278	2.63	7.56
20	Justin Verlander J. Verlander	386	0	262	.000	386	1.000	2.33	2,681	20	9	0	2589.0	1,924	671	725	201	660	87	0	12	10,250	67	9.32	2.29	4.06	0.70	26.2	6.4	1.00	.260	2.52	6.69
21	Mike Mussina M. Mussina	383	0	270	.000	384	1.000	2.60	2,138	44	23	0	2659.2	2,270	767	819	213	527	37	0	14	10,515	43	7.23	1.78	4.06	0.72	20.3	5.0	1.05	.271	2.77	7.68
22	Dennis Martinez D. Martinez	380	0	245	.000	499	1.000	2.93	1,542	94	30	8	2924.0	2,615	953	1,054	228	778	81	45	33	11,927	53	4.75	2.39	1.98	0.70	12.9	6.5	1.16	.257	3.24	8.05
23	Frank Tanana F. Tanana	380	0	240	.000	402	1.000	2.64	1,891	99	34	1	2773.0	2,417	814	910	235	749	73	10	53	11,302	73	6.14	2.43	2.52	0.76	16.7	6.6	1.14	.261	2.95	7.84
24	Early Wynn E. Wynn	379	0	300	.000	447	1.000	2.41	1,660	224	49	15	3111.0	2,525	834	928	177	1,096	42	57	11	12,691	35	4.80	3.17	1.51	0.51	13.1	8.6	1.16	.242	2.68	7.30
25	Fergie Jenkins F. Jenkins	376	0	284	.000	438	1.000	2.44	2,187	208	49	7	3070.0	2,551	831	928	263	583	49	32	52	12,162	37	6.41	1.71	3.75	0.77	18.0	4.8	1.02	.252	2.72	7.48