Roger Clemens had his worst ERA in a season in 1999, with an ERA of 4.60.

Interpreted as:

highest era in a regular season clemens recorded in his career

	NAME	ERA	REC	SEASON	TM	W%	G	W	L	GS	SO	CG	SHO	IP	H	ER	R	HR	BB	HBP	IBB	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	ERA-	FIP	FIP-	H/9	PRAA
1	Roger Clemens R. Clemens	4.60	14-10	1999	NYY	.583	30	14	10	30	163	1	1	187.2	185	96	101	20	90	9	0	822	8	7.82	4.32	1.81	0.96	19.8	10.9	1.47	.306	4.84	98	4.35	91	8.87	9.1
2	Roger Clemens R. Clemens	4.46	11-14	1993	BOS	.440	29	11	14	29	160	2	1	191.2	175	95	99	17	67	11	4	808	3	7.51	3.15	2.39	0.80	19.8	8.3	1.26	.286	4.65	99	3.68	85	8.22	13.4
3	Roger Clemens R. Clemens	4.35	13-6	2002	NYY	.684	29	13	6	29	192	0	0	180.0	172	87	94	18	63	7	6	768	14	9.60	3.15	3.05	0.90	25.0	8.2	1.31	.316	4.70	99	3.29	75	8.60	21.5
4	Roger Clemens R. Clemens	4.32	9-4	1984	BOS	.692	21	9	4	20	126	5	1	133.1	146	64	67	13	29	2	3	575	4	8.51	1.96	4.34	0.88	21.9	5.0	1.31	.328	4.52	104	2.84	72	9.86	16.4
5	Roger Clemens R. Clemens	4.18	6-6	2007	NYY	.500	18	6	6	17	68	0	0	99.0	99	46	52	9	31	5	0	420	7	6.18	2.82	2.19	0.82	16.2	7.4	1.31	.293	4.73	93	4.13	93	9.00	3.4
6	Roger Clemens R. Clemens	4.18	10-5	1995	BOS	.667	23	10	5	23	132	0	0	140.0	141	65	70	15	60	14	0	623	9	8.49	3.86	2.20	0.96	21.2	9.6	1.44	.313	4.50	86	4.19	90	9.06	6.8
7	Roger Clemens R. Clemens	3.91	17-9	2003	NYY	.654	33	17	9	33	190	1	1	211.2	199	92	99	24	58	5	1	878	5	8.08	2.47	3.28	1.02	21.6	6.6	1.21	.291	4.21	87	3.60	81	8.46	20.3
8	Roger Clemens R. Clemens	3.70	13-8	2000	NYY	.619	32	13	8	32	188	1	0	204.1	184	84	96	26	84	10	0	878	2	8.28	3.70	2.24	1.15	21.4	9.6	1.31	.277	4.23	77	4.32	90	8.10	11.4
9	Roger Clemens R. Clemens	3.63	10-13	1996	BOS	.435	34	10	13	34	257	6	2	242.2	216	98	106	19	106	4	2	1,032	8	9.53	3.93	2.42	0.70	24.9	10.3	1.33	.305	3.93	71	3.42	70	8.01	39.1
10	Roger Clemens R. Clemens	3.51	20-3	2001	NYY	.870	33	20	3	33	213	0	0	220.1	205	86	94	19	72	5	1	918	14	8.70	2.94	2.96	0.78	23.2	7.8	1.26	.305	3.84	80	3.28	74	8.37	28.1
11	Roger Clemens R. Clemens	3.29	7-5	1985	BOS	.583	15	7	5	15	74	3	1	98.1	83	36	38	5	37	3	0	407	1	6.77	3.39	2.00	0.46	18.2	9.1	1.22	.271	3.48	78	3.06	76	7.60	10.5
12	Roger Clemens R. Clemens	3.13	17-11	1989	BOS	.607	35	17	11	35	230	8	3	253.1	215	88	101	20	93	8	5	1,044	7	8.17	3.30	2.47	0.71	22.0	8.9	1.22	.281	3.59	77	3.16	83	7.64	17.9
13	Roger Clemens R. Clemens	2.98	18-4	2004	HOU	.818	33	18	4	33	218	0	0	214.1	169	71	76	15	79	6	5	878	5	9.15	3.32	2.76	0.63	24.8	9.0	1.16	.275	3.19	69	3.11	70	7.10	31.7
14	Roger Clemens R. Clemens	2.97	20-9	1987	BOS	.690	36	20	9	36	256	18	7	281.2	248	93	100	19	83	9	4	1,157	4	8.18	2.65	3.08	0.61	22.1	7.2	1.18	.290	3.20	65	2.90	66	7.92	46.6
15	Roger Clemens R. Clemens	2.93	18-12	1988	BOS	.600	35	18	12	35	291	14	8	264.0	217	86	93	17	62	6	4	1,063	4	9.92	2.11	4.69	0.58	27.4	5.8	1.06	.291	3.17	72	2.17	56	7.40	50.5
16	Roger Clemens R. Clemens	2.85	9-7	1994	BOS	.563	24	9	7	24	168	3	1	170.2	124	54	62	15	71	4	1	692	4	8.86	3.74	2.37	0.79	24.3	10.3	1.14	.251	3.27	57	3.61	77	6.54	20.4
17	Roger Clemens R. Clemens	2.65	20-6	1998	TOR	.769	33	20	6	33	271	5	3	234.2	169	69	78	11	88	7	0	961	6	10.39	3.38	3.08	0.42	28.2	9.2	1.10	.271	2.99	57	2.65	59	6.48	49.2
18	Roger Clemens R. Clemens	2.62	18-10	1991	BOS	.643	35	18	10	35	241	13	4	271.1	219	79	93	15	65	5	12	1,077	6	7.99	2.16	3.71	0.50	22.4	6.0	1.05	.272	3.08	61	2.57	63	7.26	44.5
19	Roger Clemens R. Clemens	2.48	24-4	1986	BOS	.857	33	24	4	33	238	10	1	254.0	179	70	77	21	67	4	0	997	11	8.43	2.37	3.55	0.74	23.9	6.7	0.97	.237	2.73	58	2.80	69	6.34	36.3
20	Roger Clemens R. Clemens	2.41	18-11	1992	BOS	.621	32	18	11	32	208	11	5	246.2	203	66	80	11	62	9	5	989	3	7.59	2.26	3.35	0.40	21.0	6.3	1.07	.275	2.92	58	2.53	64	7.41	39.2
21	Roger Clemens R. Clemens	2.30	7-6	2006	HOU	.538	19	7	6	19	102	0	0	113.1	89	29	34	7	29	4	1	451	3	8.10	2.30	3.52	0.56	22.6	6.4	1.04	.265	2.70	52	3.02	66	7.07	19.4
22	Roger Clemens R. Clemens	2.05	21-7	1997	TOR	.750	34	21	7	34	292	9	3	264.0	204	60	65	9	68	12	1	1,044	4	9.95	2.32	4.29	0.31	28.0	6.5	1.03	.294	2.22	45	2.24	50	6.95	66.3
23	Roger Clemens R. Clemens	1.93	21-6	1990	BOS	.778	31	21	6	31	209	7	4	228.1	193	49	59	7	54	7	3	920	8	8.24	2.13	3.87	0.28	22.7	5.9	1.08	.289	2.33	47	2.17	55	7.61	44.8
24	Roger Clemens R. Clemens	1.87	13-8	2005	HOU	.619	32	13	8	32	185	1	0	211.1	151	44	51	11	62	3	5	838	3	7.88	2.64	2.98	0.47	22.1	7.4	1.01	.243	2.17	44	2.86	67	6.43	33.4