fewest runs allowed by mlb team in first 15 games of any season

The Houston Colt .45's gave up the fewest runs by a team in a season in their first 15 games, with 42 runs in 1962.

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Data note: Runs Allowed: team game data complete from 1901
Data note: Data: Retrosheet

	TEAM	R	SEASON	G	W%	W	L	ERA	SO	SHO	SV	IP	H	ER	HR	BB	HBP	IBB	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	H/9
1	Colt .45's	42	1962	15	.429	6	8	2.07	114	2	2	143.2	124	33	7	35	7	2	579	3	7.14	2.19	3.26	0.44	19.7	6.0	1.11	.281	2.63	7.77
2	Royals	50	1969	15	.533	8	7	2.90	85	0	4	143.0	114	46	12	58	5	3	595	5	5.35	3.65	1.47	0.76	14.3	9.7	1.20	.234	3.15	7.17
3	Senators	54	1961	15	.267	4	11	3.19	60	0	2	132.2	120	47	9	49	7	5	560	3	4.07	3.32	1.22	0.61	10.7	8.8	1.27	.255	3.66	8.14
4	Highlanders	58	1903	15	.533	8	7	0.00	31	0	1	131.0	131	0	2	27	6		406	5	2.13	1.85	1.15	0.14	7.6	6.7	1.21	.379	3.98	9.00
5	Beaneaters	61	1901	15	.533	8	7	0.00	53	1	0	136.1	128	0	5	42	1		439	3	3.50	2.77	1.26	0.33	12.1	9.6	1.25	.364	4.03	8.45
6	Marlins	62	1993	15	.333	5	10	3.85	89	0	4	133.1	127	57	11	53	2	2	566	4	6.01	3.58	1.68	0.74	15.7	9.4	1.35	.282	4.18	8.57
7	Giants	63	1901	15	.667	10	5	0.00	66	3	1	130.0	125	0	0	28	5		463	3	4.57	1.94	2.36	0.00	14.3	6.0	1.18	.343	4.36	8.65
8	Angels	64	1961	15	.333	5	10	3.71	72	0	1	133.1	117	55	14	87	1	5	587	7	4.86	5.87	0.83	0.95	12.3	14.8	1.53	.249	4.32	7.90
9	Blue Jays	69	1977	15	.467	7	8	4.35	78	0	3	130.1	138	63	13	60	1	2	575	3	5.39	4.14	1.30	0.90	13.6	10.4	1.52	.296	4.76	9.53
10	Padres	69	1969	15	.333	5	10	4.53	73	0	3	129.0	125	65	16	66	4	7	575	5	5.09	4.60	1.11	1.12	12.7	11.5	1.48	.262	4.81	8.72
11	Pirates	69	1901	15	.667	10	5	0.00	49	2	1	132.0	151	0	2	31	6		461	3	3.34	2.11	1.58	0.14	10.6	6.7	1.38	.399	4.70	10.30
12	Devil Rays	71	1998	15	.600	9	6	4.20	88	0	2	137.0	146	64	11	67	5	3	596	4	5.78	4.40	1.31	0.72	14.8	11.2	1.55	.318	4.66	9.59
13	Expos	71	1969	15	.400	6	9	3.35	85	2	3	137.0	128	51	10	65	2	3	601	3	5.58	4.27	1.31	0.66	14.1	10.8	1.41	.269	4.66	8.41
14	Pilots	72	1969	15	.400	6	9	4.51	90	1	5	131.2	129	66	15	64	5	9	590	9	6.15	4.37	1.41	1.03	15.3	10.8	1.47	.274	4.92	8.82
15	Senators	72	1901	15	.600	9	6	0.00	20	1	0	134.0	132	0	6	31	3		525	3	1.34	2.08	0.65	0.40	3.8	5.9	1.22	.271	4.84	8.87
16	White Sox	74	1901	15	.733	11	4	0.00	8	0	0	135.2	134	0	5	48	3		512	5	0.53	3.18	0.17	0.33	1.6	9.4	1.34	.288	4.91	8.89
17	Superbas	76	1901	15	.467	7	8	0.00	42	0	0	134.0	121	0	4	56	7		461	1	2.82	3.76	0.75	0.27	9.1	12.1	1.32	.332	5.10	8.13
18	Rockies	78	1993	15	.400	6	9	4.81	74	0	1	129.0	152	69	10	68	5	6	610	6	5.16	4.74	1.09	0.70	12.1	11.1	1.71	.313	5.44	10.60
19	Mariners	82	1977	15	.400	6	9	4.73	65	0	4	137.0	143	72	19	57	4	5	593	8	4.27	3.74	1.14	1.25	11.0	9.6	1.46	.277	5.39	9.39
20	Phillies	82	1901	15	.400	6	9	0.00	53	0	0	129.0	144	0	2	37	7		467	2	3.70	2.58	1.43	0.14	11.3	7.9	1.40	.386	5.72	10.05
21	Diamondbacks	90	1998	15	.133	2	13	6.34	78	0	2	127.2	139	90	25	41	5	5	551	3	5.50	2.89	1.90	1.76	14.2	7.4	1.41	.284	6.34	9.80
22	Blues	92	1901	15	.267	4	11	0.00	7	0	0	130.0	151	0	0	54	6		603	9	0.48	3.74	0.13	0.00	1.2	9.0	1.58	.282	6.37	10.45
23	Cardinals	98	1901	15	.500	7	7	0.00	-13	0	1	136.1	161	0	7	38	9		437	1	-0.86	2.51	-0.34	0.46	-3.0	8.7	1.46	.389	6.47	10.63
24	Americans	99	1901	15	.467	7	8	0.00	-7	0	0	131.0	159	0	4	25	6		528	1	-0.48	1.72	-0.28	0.27	-1.3	4.7	1.40	.310	6.80	10.92
25	Reds	100	1901	15	.643	9	5	0.00	-7	0	0	138.2	155	0	3	48	14		523	4	-0.45	3.12	-0.15	0.19	-1.3	9.2	1.46	.327	6.49	10.06

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Phillies - w	88	74	.543	6.0
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Wed 10/28	MIL	@	TBR	8:00 PM
Fri 10/30	TBR	@	MIL	8:00 PM
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The Houston Colt .45's gave up the fewest runs by a team in a season in their first 15 games, with 42 runs in 1962.

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