Lefty Grove had the best ERA in the AL in 1939, with an ERA of 2.54.

Interpreted as:

Who had the best era with a minimum of 1 IP per team game in the al in 1939?

	NAME	ERA	SEASON	TM	G	W	L	W%	GS	SO	CG	SHO	SV	IP	H	ER	R	HR	BB	HBP	GF	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	ERA-	FIP	FIP-	H/9	PRAA
1	Lefty Grove L. Grove	2.54	1939	BSA	23	15	4	.789	23	81	17	2	0	191.0	180	54	63	8	58	1	0	798	0	3.82	2.73	1.40	0.38	10.2	7.3	1.25	.265	2.97	53	3.60	78	8.48	20.9
2	Ted Lyons T. Lyons	2.76	1939	CWS	21	14	6	.700	21	65	16	0	0	172.2	162	53	71	7	26	1	0	702	0	3.39	1.36	2.50	0.36	9.3	3.7	1.09	.257	3.70	60	3.22	73	8.44	23
3	Bob Feller B. Feller	2.85	1939	CLE	39	24	9	.727	35	246	24	4	1	296.2	227	94	105	13	142	3	3	1,243	14	7.46	4.31	1.73	0.39	19.8	11.4	1.24	.255	3.19	64	3.35	78	6.89	32.4
4	Red Ruffing R. Ruffing	2.93	1939	NYY	28	21	7	.750	28	95	22	5	0	233.1	211	76	88	15	75	2	0	968	3	3.66	2.89	1.27	0.58	9.8	7.7	1.23	.251	3.39	66	3.98	93	8.14	7.2
5	Bump Hadley B. Hadley	2.98	1939	NYY	26	12	6	.667	18	65	7	1	2	154.0	132	51	62	10	85	3	6	658	4	3.80	4.97	0.76	0.58	9.9	12.9	1.41	.246	3.62	67	4.69	110	7.71	-7.7
6	Lefty Gomez L. Gomez	3.41	1939	NYY	26	12	8	.600	26	102	14	2	0	198.0	173	75	80	11	84	3	0	831	3	4.64	3.82	1.21	0.50	12.3	10.1	1.30	.257	3.64	77	3.98	93	7.86	6.2
7	Tommy Bridges T. Bridges	3.50	1939	DET	29	17	7	.708	26	129	16	2	2	198.0	186	77	87	11	61	6	2	840	4	5.86	2.77	2.11	0.50	15.4	7.3	1.25	.276	3.95	71	3.41	72	8.45	28.1
8	Mel Harder M. Harder	3.50	1939	CLE	29	15	9	.625	26	67	12	1	1	208.0	213	81	89	15	64	3	3	877	1	2.90	2.77	1.05	0.65	7.6	7.3	1.33	.272	3.85	78	4.23	98	9.22	1.7
9	Dutch Leonard D. Leonard	3.54	1939	WSH	34	20	8	.714	34	88	21	2	0	269.1	273	106	124	16	59	5	0	1,133	6	2.94	1.97	1.49	0.53	7.8	5.2	1.23	.266	4.14	81	3.80	90	9.12	12.5
10	Bobo Newsom B. Newsom	3.58	1939	TOT	41	20	11	.645	37	192	24	3	2	291.2	272	116	126	19	126	3	4	1,261	4	5.92	3.89	1.52	0.59	15.2	10.0	1.36	.275	3.89	73	3.83	81	8.39	28
11	Dizzy Trout D. Trout	3.61	1939	DET	33	9	10	.474	22	72	6	0	2	162.0	168	65	82	5	74	4	6	716	5	4.00	4.11	0.97	0.28	10.1	10.3	1.49	.291	4.56	74	3.93	83	9.33	14.1
12	Johnny Rigney J. Rigney	3.70	1939	CWS	35	15	8	.652	29	119	11	2	0	218.2	208	90	103	10	84	2	4	946	3	4.90	3.46	1.42	0.41	12.6	8.9	1.34	.271	4.24	81	3.66	83	8.56	18.3
13	Atley Donald A. Donald	3.71	1939	NYY	24	13	3	.813	20	55	11	2	1	153.0	144	63	74	12	60	0	2	657	1	3.24	3.53	0.92	0.71	8.4	9.1	1.33	.249	4.35	84	4.45	104	8.47	-3.5
14	Al Milnar A. Milnar	3.79	1939	CLE	37	14	12	.538	26	76	12	2	3	209.0	212	88	96	11	99	0	10	920	4	3.27	4.26	0.77	0.47	8.3	10.8	1.49	.274	4.13	85	4.35	101	9.13	-1.1
15	Eddie Smith E. Smith	3.79	1939	TOT	32	10	11	.476	22	70	7	1	0	180.1	168	76	87	11	92	4	5	782	3	3.49	4.59	0.76	0.55	9.0	11.8	1.44	.260	4.34	83	4.59	104	8.38	-3.7
16	Ken Chase K. Chase	3.80	1939	WSH	32	10	19	.345	31	118	15	1	0	232.0	215	98	116	10	114	1	1	1,019	11	4.58	4.42	1.04	0.39	11.6	11.2	1.42	.264	4.50	87	4.00	95	8.34	5.4
17	Thornton Lee T. Lee	4.21	1939	CWS	33	15	11	.577	29	81	15	2	3	235.0	260	110	121	15	70	3	4	1,008	2	3.10	2.68	1.16	0.57	8.0	6.9	1.40	.292	4.63	92	4.04	92	9.96	9.5
18	Fritz Ostermueller F. Ostermueller	4.24	1939	BSA	34	11	7	.611	20	61	8	0	4	159.1	173	75	86	6	58	2	9	701	5	3.45	3.28	1.05	0.34	8.7	8.3	1.45	.291	4.86	89	3.83	83	9.77	13.4
19	Johnny Allen J. Allen	4.58	1939	CLE	28	9	7	.563	26	79	9	2	0	175.0	199	89	96	9	56	3	2	763	5	4.06	2.88	1.41	0.46	10.4	7.3	1.46	.308	4.94	102	3.75	87	10.23	11.1
20	Joe Krakauskas J. Krakauskas	4.60	1939	WSH	39	11	17	.393	29	110	12	0	1	217.1	230	111	125	13	114	1	8	966	5	4.56	4.72	0.96	0.54	11.4	11.8	1.58	.298	5.18	105	4.33	102	9.52	-3.1
21	Jack Wilson J. Wilson	4.67	1939	BSA	36	11	11	.500	22	80	6	0	2	177.1	198	92	109	10	75	1	5	797	4	4.06	3.81	1.07	0.51	10.0	9.4	1.54	.298	5.53	98	4.09	89	10.05	9.9
22	Alex Carrasquel A. Carrasquel	4.69	1939	WSH	40	5	9	.357	17	41	7	0	2	159.1	165	83	89	7	68	1	14	702	2	2.32	3.84	0.60	0.40	5.8	9.7	1.46	.270	5.03	107	4.33	102	9.32	-2.4
23	Lynn Nelson L. Nelson	4.78	1939	PHA	35	10	13	.435	24	75	12	2	1	197.2	233	105	117	27	64	3	11	877	0	3.41	2.91	1.17	1.23	8.6	7.3	1.50	.291	5.33	103	5.01	112	10.61	-12.1
24	Schoolboy Rowe S. Rowe	4.99	1939	DET	28	10	12	.455	24	51	8	1	0	164.0	192	91	113	17	61	2	2	734	2	2.80	3.35	0.84	0.93	6.9	8.3	1.54	.290	6.20	102	4.85	103	10.54	-1.5
25	Roxie Lawson R. Lawson	5.28	1939	TOT	38	4	8	.333	15	47	5	0	0	162.0	188	95	100	11	90	2	15	743	4	2.61	5.00	0.52	0.61	6.3	12.1	1.72	.298	5.56	110	4.98	107	10.44	-5.4