Dave Stewart had the worst ERA in 1991, with an ERA of 5.18.

Interpreted as:

pitchers with highest era with a minimum of 1 IP per team game 1991

	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	Dave Stewart D. Stewart	5.18	1991	OAK	35	11	11	.500	35	144	2	1	0	226.0	245	130	135	24	105	9	0	1	1,014	13	5.73	4.18	1.37	0.96	14.2	10.4	1.55	.302	5.38	133	4.47	113	9.76	-13.2
2	Rich DeLucia R. DeLucia	5.09	1991	SEA	32	12	13	.480	31	98	0	0	0	182.0	176	103	107	31	78	4	0	4	779	10	4.85	3.86	1.26	1.53	12.6	10.0	1.40	.255	5.29	123	5.34	132	8.70	-26.2
3	Oil Can Boyd O. Can Boyd	4.59	1991	TOT	31	8	15	.348	31	115	1	1	0	182.1	196	93	96	21	57	0	0	3	773	2	5.68	2.81	2.02	1.04	14.9	7.4	1.39	.302	4.74	120	4.02	106	9.67	-5
4	Bob Welch B. Welch	4.58	1991	OAK	35	12	13	.480	35	101	7	1	0	220.0	220	112	124	25	91	11	0	3	950	3	4.13	3.72	1.11	1.02	10.6	9.6	1.41	.270	5.07	118	4.80	121	9.00	-21.1
5	Alex Fernandez A. Fernandez	4.51	1991	CWS	34	9	13	.409	32	145	2	0	0	191.2	186	96	100	16	88	2	1	2	827	4	6.81	4.13	1.65	0.75	17.5	10.6	1.43	.295	4.70	114	3.83	96	8.73	3.6
6	Mark Portugal M. Portugal	4.49	1991	HOU	32	10	12	.455	27	120	1	0	1	168.1	163	84	91	19	59	2	3	5	710	4	6.42	3.15	2.03	1.02	16.9	8.3	1.32	.282	4.87	126	3.98	112	8.71	-8.7
7	Mike Bielecki M. Bielecki	4.46	1991	TOT	41	13	11	.542	25	75	0	0	0	173.2	171	86	91	18	56	2	9	6	727	6	3.89	2.90	1.34	0.93	10.3	7.7	1.31	.266	4.72	115	4.34	112	8.86	-8.7
8	Kevin Brown K. Brown	4.40	1991	TEX	33	9	12	.429	33	96	0	0	0	210.2	233	103	116	17	90	13	0	5	934	12	4.10	3.84	1.07	0.73	10.3	9.6	1.53	.301	4.96	109	4.45	111	9.95	-10.8
9	Greg Hibbard G. Hibbard	4.31	1991	CWS	32	11	11	.500	29	71	5	0	0	194.0	196	93	107	23	57	2	1	1	806	1	3.29	2.64	1.25	1.07	8.8	7.1	1.30	.265	4.96	109	4.57	114	9.09	-12.5
10	Ron Darling R. Darling	4.26	1991	TOT	32	8	15	.348	32	129	0	0	0	194.1	185	92	100	22	71	9	0	3	827	16	5.97	3.29	1.82	1.02	15.6	8.6	1.32	.273	4.63	115	4.23	112	8.57	-9.5
11	Kirk McCaskill K. McCaskill	4.26	1991	CAL	30	10	19	.345	30	71	1	0	0	177.2	193	84	93	19	66	3	0	1	762	6	3.60	3.34	1.08	0.96	9.3	8.7	1.46	.289	4.71	104	4.61	112	9.78	-9.2
12	Walt Terrell W. Terrell	4.24	1991	DET	35	12	14	.462	33	80	8	2	0	218.2	257	103	115	16	79	2	1	10	954	8	3.29	3.25	1.01	0.66	8.4	8.3	1.54	.310	4.73	103	4.18	100	10.58	-0.1
13	Tom Browning T. Browning	4.18	1991	CIN	36	14	14	.500	36	115	1	0	0	230.1	241	107	124	32	56	4	0	4	983	3	4.49	2.19	2.05	1.25	11.7	5.7	1.29	.269	4.85	111	4.44	114	9.42	-13
14	John Burkett J. Burkett	4.18	1991	SFG	36	12	11	.522	34	131	3	1	0	206.2	223	96	103	19	60	10	0	2	890	5	5.70	2.61	2.18	0.83	14.7	6.7	1.37	.304	4.49	118	3.79	102	9.71	-2.1
15	Charles Nagy C. Nagy	4.13	1991	CLE	33	10	15	.400	33	109	6	1	0	211.1	228	97	103	15	66	6	0	7	914	6	4.64	2.81	1.65	0.64	11.9	7.2	1.39	.297	4.39	101	3.76	94	9.71	5.6
16	Mike Boddicker M. Boddicker	4.08	1991	KCR	30	12	12	.500	29	79	1	0	0	180.2	188	82	89	13	59	13	1	0	775	3	3.94	2.94	1.34	0.65	10.2	7.6	1.37	.286	4.43	100	4.11	106	9.37	-5.1
17	Charlie Hough C. Hough	4.02	1991	CWS	31	9	10	.474	29	107	4	1	0	199.1	167	89	98	21	94	11	1	0	858	5	4.83	4.24	1.14	0.95	12.5	11.0	1.31	.234	4.42	101	4.73	118	7.54	-16.3
18	Bob Milacki B. Milacki	4.01	1991	BAL	31	10	9	.526	26	108	3	1	0	184.0	175	82	86	17	53	1	1	3	758	1	5.28	2.59	2.04	0.83	14.2	7.0	1.24	.273	4.21	100	3.76	93	8.56	5.8
19	Bud Black B. Black	3.99	1991	SFG	34	12	16	.429	34	104	3	3	0	214.1	201	95	104	25	71	4	0	8	893	6	4.37	2.98	1.46	1.05	11.6	8.0	1.27	.255	4.37	113	4.45	120	8.44	-17.9
20	Randy Johnson R. Johnson	3.98	1991	SEA	33	13	10	.565	33	228	2	1	0	201.1	151	89	96	15	152	12	0	0	889	12	10.19	6.79	1.50	0.67	25.6	17.1	1.50	.282	4.29	96	4.00	99	6.75	1
21	Frank Viola F. Viola	3.97	1991	NYM	35	13	15	.464	35	132	3	0	0	231.1	259	102	112	25	54	1	0	4	980	6	5.14	2.10	2.44	0.97	13.5	5.5	1.35	.305	4.36	110	3.83	103	10.08	-3.2
22	Jaime Navarro J. Navarro	3.92	1991	MIL	34	15	12	.556	34	114	10	2	0	234.0	237	102	117	18	73	6	0	3	1,002	10	4.38	2.81	1.56	0.69	11.4	7.3	1.32	.277	4.50	98	3.89	98	9.12	1.7
23	Bill Gullickson B. Gullickson	3.90	1991	DET	35	20	9	.690	35	91	4	0	0	226.1	256	98	109	22	44	4	0	13	954	4	3.62	1.75	2.07	0.87	9.5	4.6	1.33	.295	4.33	94	3.95	95	10.18	5.6
24	Bryn Smith B. Smith	3.85	1991	STL	31	12	9	.571	31	94	3	0	0	198.2	188	85	95	16	45	7	0	3	818	3	4.26	2.04	2.09	0.72	11.5	5.5	1.17	.262	4.30	106	3.74	101	8.52	-0.7
25	Greg Harris G. Harris	3.85	1991	BOS	53	11	12	.478	21	127	1	0	2	173.0	157	74	79	13	69	5	15	5	731	6	6.61	3.59	1.84	0.68	17.4	9.4	1.31	.279	4.11	90	3.64	90	8.17	7.7

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DATE	MATCHUP			TIME (ET)
Fri 6/12	COL	@	ATH	10:05 PM
Sat 6/13	COL	@	ATH	10:05 PM
Sun 6/14	COL	@	ATH	3:05 PM
Mon 6/15	PIT	@	ATH	9:40 PM
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Mets	30	38	.441	15.0
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Cardinals	37	29	.561	4.0
Pirates	35	33	.515	7.0
Cubs	34	34	.500	8.0
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Dave Stewart had the worst ERA in 1991, with an ERA of 5.18.

Interpreted as:

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