Nolan Ryan had an ERA of 15.00 in his rookie season in 1966.

	NAME	ERA	SEASON	TM	G	W	L	W%	GS	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	ERA-	FIP	FIP-	H/9	PRAA
1	Nolan Ryan N. Ryan	15.00	1966	NYM	2	0	1	.000	1	6	0	0	0	3.0	5	5	5	1	3	0	0	1	17	1	18.00	9.00	2.00	3.00	35.3	17.6	2.67	.571	15.00	420	5.89	170	15.00	-0.8
2	Nolan Ryan N. Ryan	3.09	1968	NYM	21	6	9	.400	18	133	3	0	0	134.0	93	46	50	12	75	4	1	4	559	7	8.93	5.04	1.77	0.81	23.8	13.4	1.25	.242	3.36	103	3.33	118	6.25	-7.6
3	Nolan Ryan N. Ryan	3.53	1969	NYM	25	6	3	.667	10	92	2	0	1	89.1	60	35	38	3	53	1	4	3	375	1	9.27	5.34	1.74	0.30	24.5	14.1	1.26	.252	3.83	99	2.69	79	6.04	7.1
4	Nolan Ryan N. Ryan	3.42	1970	NYM	27	7	11	.389	19	125	5	2	1	131.2	86	50	59	10	97	4	4	2	570	8	8.54	6.63	1.29	0.68	21.9	17.0	1.39	.228	4.03	86	4.02	107	5.88	-4
5	Nolan Ryan N. Ryan	3.97	1971	NYM	30	10	14	.417	26	137	3	0	0	152.0	125	67	78	8	116	15	1	4	705	6	8.11	6.87	1.18	0.47	19.4	16.5	1.59	.273	4.62	117	3.91	118	7.40	-10.6
6	Nolan Ryan N. Ryan	2.28	1972	CAL	39	19	16	.543	39	329	20	9	0	284.0	166	72	80	14	157	10	0	4	1,154	18	10.43	4.98	2.10	0.44	28.5	13.6	1.14	.236	2.54	79	2.48	83	5.26	16.6
7	Nolan Ryan N. Ryan	2.87	1973	CAL	41	21	16	.568	39	383	26	4	1	326.0	238	104	113	18	162	7	2	2	1,355	15	10.57	4.47	2.36	0.50	28.3	12.0	1.23	.280	3.12	80	2.48	69	6.57	40.9
8	Nolan Ryan N. Ryan	2.89	1974	CAL	42	22	16	.579	41	367	26	3	0	332.2	221	107	127	18	202	9	1	3	1,392	9	9.93	5.46	1.82	0.49	26.4	14.5	1.27	.255	3.44	85	2.97	84	5.98	20.2
9	Nolan Ryan N. Ryan	3.45	1975	CAL	28	14	12	.538	28	186	10	5	0	198.0	152	76	90	13	132	7	0	0	864	12	8.45	6.00	1.41	0.59	21.5	15.3	1.43	.264	4.09	96	3.66	99	6.91	0.5
10	Nolan Ryan N. Ryan	3.36	1976	CAL	39	17	18	.486	39	327	21	7	0	284.1	193	106	117	13	183	5	0	2	1,196	5	10.35	5.79	1.79	0.41	27.3	15.3	1.32	.269	3.70	99	2.91	85	6.11	16.5
11	Nolan Ryan N. Ryan	2.77	1977	CAL	37	19	16	.543	37	341	22	4	0	299.0	198	92	110	12	204	9	0	7	1,272	21	10.26	6.14	1.67	0.36	26.8	16.0	1.34	.263	3.31	72	3.11	79	5.96	27.9
12	Nolan Ryan N. Ryan	3.72	1978	CAL	31	10	13	.435	31	260	14	3	0	234.2	183	97	106	12	148	3	0	7	1,008	13	9.97	5.68	1.76	0.46	25.8	14.7	1.41	.292	4.07	103	2.95	79	7.02	20.3
13	Nolan Ryan N. Ryan	3.60	1979	CAL	34	16	14	.533	34	223	17	5	0	222.2	169	89	104	15	114	6	0	3	937	9	9.01	4.61	1.96	0.61	23.8	12.2	1.27	.266	4.20	88	3.21	78	6.83	22.2
14	Nolan Ryan N. Ryan	3.35	1980	HOU	35	11	10	.524	35	200	4	2	0	233.2	205	87	100	10	98	3	0	1	982	10	7.70	3.77	2.04	0.39	20.4	10.0	1.30	.291	3.85	99	2.89	83	7.90	15.1
15	Nolan Ryan N. Ryan	1.69	1981	HOU	21	11	5	.688	21	140	5	3	0	149.0	99	28	34	2	68	1	0	1	605	16	8.46	4.11	2.06	0.12	23.1	11.2	1.12	.246	2.05	52	2.28	70	5.98	16.5
16	Nolan Ryan N. Ryan	3.16	1982	HOU	35	16	12	.571	35	245	10	3	0	250.1	196	88	100	20	109	8	0	3	1,050	18	8.81	3.92	2.25	0.72	23.3	10.4	1.22	.263	3.60	93	3.19	95	7.05	4
17	Nolan Ryan N. Ryan	2.98	1983	HOU	29	14	9	.609	29	183	5	2	0	196.1	134	65	74	9	101	4	0	3	804	5	8.39	4.63	1.81	0.41	22.8	12.6	1.20	.247	3.39	87	3.08	88	6.14	8.7
18	Nolan Ryan N. Ryan	3.04	1984	HOU	30	12	11	.522	30	197	5	2	0	183.2	143	62	78	12	69	4	0	2	760	6	9.65	3.38	2.86	0.59	25.9	9.1	1.15	.274	3.82	88	2.66	79	7.01	15.1
19	Nolan Ryan N. Ryan	3.80	1985	HOU	35	10	12	.455	35	209	4	0	0	232.0	205	98	108	12	95	9	0	8	983	14	8.11	3.69	2.20	0.47	21.3	9.7	1.29	.293	4.19	111	2.89	84	7.95	14.2
20	Nolan Ryan N. Ryan	3.34	1986	HOU	30	12	8	.600	30	194	1	0	0	178.0	119	66	72	14	82	4	0	5	729	15	9.81	4.15	2.37	0.71	26.6	11.2	1.13	.241	3.64	95	3.05	87	6.02	9.2
21	Nolan Ryan N. Ryan	2.76	1987	HOU	34	8	16	.333	34	270	0	0	0	211.2	154	65	75	14	87	4	0	2	873	10	11.48	3.70	3.10	0.60	30.9	10.0	1.14	.281	3.19	70	2.46	63	6.55	34.5
22	Nolan Ryan N. Ryan	3.52	1988	HOU	33	12	11	.522	33	228	4	1	0	220.0	186	86	98	18	87	7	0	6	930	10	9.33	3.56	2.62	0.74	24.5	9.4	1.24	.285	4.01	105	3.03	91	7.61	7.1
23	Nolan Ryan N. Ryan	3.20	1989	TEX	32	16	10	.615	32	301	6	2	0	239.1	162	85	96	17	98	9	0	3	988	19	11.32	3.69	3.07	0.64	30.5	9.9	1.09	.258	3.61	82	2.50	65	6.09	35.1
24	Nolan Ryan N. Ryan	3.44	1990	TEX	30	13	9	.591	30	232	5	2	0	204.0	137	78	86	18	74	7	0	2	818	9	10.24	3.26	3.14	0.79	28.4	9.0	1.03	.244	3.79	88	2.86	73	6.04	23.7
25	Nolan Ryan N. Ryan	2.91	1991	TEX	27	12	6	.667	27	203	2	2	0	173.0	102	56	58	12	72	5	0	0	683	8	10.56	3.75	2.82	0.62	29.7	10.5	1.01	.230	3.02	72	2.74	68	5.31	24.4