lowest single season world series era and minimum 20 innings pitched since 1947

Since 1947, Sandy Koufax has the best ERA with 20.0+ innings pitched in a World Series, with an ERA of 0.38.

Interpreted as:

lowest single season world series era by a player and minimum 20 innings pitched since 1947

	NAME	ERA	IP	SEASON	SERIES	TM	G	W	L	W%	GS	SO	CG	SHO	SV	H	ER	R	HR	BB	HBP	GF	IBB	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	H/9
1	Sandy Koufax S. Koufax	0.38	24.0	1965	World Series	LAD	3	2	1	.667	3	29	2	2	0	13	1	2	0	5	0	0	0	87	0	10.88	1.88	5.80	0.00	33.3	5.7	0.75	.245	0.75	4.88
2	Madison Bumgarner M. Bumgarner	0.43	21.0	2014	World Series	SFG	3	2	0	1.000	2	17	1	1	1	9	1	1	1	1	1	1	0	74	0	7.29	0.43	17.00	0.43	23.0	1.4	0.48	.148	0.43	3.86
3	Lew Burdette L. Burdette	0.67	27.0	1957	World Series	MIL	3	3	0	1.000	3	13	3	2	0	21	2	2	1	4	0	0	1	104	0	4.33	1.33	3.25	0.33	12.5	3.8	0.93	.233	0.67	7.00
4	Bob Gibson B. Gibson	1.00	27.0	1967	World Series	STL	3	3	0	1.000	3	26	3	1	0	14	3	3	1	5	0	0	0	98	1	8.67	1.67	5.20	0.33	26.5	5.1	0.70	.197	1.00	4.67
5	Jack Morris J. Morris	1.17	23.0	1991	World Series	MIN	3	2	0	1.000	3	15	1	1	0	18	3	3	1	9	0	0	1	92	1	5.87	3.52	1.67	0.39	16.3	9.8	1.17	.254	1.17	7.04
6	Mickey Lolich M. Lolich	1.67	27.0	1968	World Series	DET	3	3	0	1.000	3	21	3	0	0	20	5	5	2	6	1	0	0	104	0	7.00	2.00	3.50	0.67	20.2	5.8	0.96	.243	1.67	6.67
7	Bob Gibson B. Gibson	1.67	27.0	1968	World Series	STL	3	2	1	.667	3	35	3	1	0	18	5	5	1	4	0	0	1	101	0	11.67	1.33	8.75	0.33	34.7	4.0	0.81	.279	1.67	6.00
8	Curt Schilling C. Schilling	1.69	21.1	2001	World Series	ARI	3	1	0	1.000	3	26	0	0	0	12	4	4	2	2	1	0	0	77	0	10.97	0.84	13.00	0.84	33.8	2.6	0.66	.217	1.69	5.06
9	Allie Reynolds A. Reynolds	1.77	20.1	1952	World Series	NYY	4	2	1	.667	2	18	1	1	1	12	4	4	2	6	0	1	0	74	1	7.97	2.66	3.00	0.89	24.3	8.1	0.89	.208	1.77	5.31
10	Ralph Terry R. Terry	1.80	25.0	1962	World Series	NYY	3	2	1	.667	3	16	2	1	0	17	5	5	2	2	1	0	0	94	0	5.76	0.72	8.00	0.72	17.0	2.1	0.76	.205	1.80	6.12
11	Jack Sanford J. Sanford	1.93	23.1	1962	World Series	SFG	3	1	2	.333	3	19	1	1	0	16	5	6	1	8	0	0	0	93	1	7.33	3.09	2.38	0.39	20.4	8.6	1.03	.231	2.31	6.17
12	Bruce Hurst B. Hurst	1.96	23.0	1986	World Series	BOS	3	2	0	1.000	3	17	1	0	0	18	5	5	1	6	0	0	0	91	0	6.65	2.35	2.83	0.39	18.7	6.6	1.04	.254	1.96	7.04
13	Warren Spahn W. Spahn	2.20	28.2	1958	World Series	MIL	3	2	1	.667	3	18	2	1	0	19	7	7	4	8	0	0	0	113	1	5.65	2.51	2.25	1.26	15.9	7.1	0.94	.181	2.20	5.97
14	Joe Black J. Black	2.53	21.1	1952	World Series	BKN	3	1	2	.333	3	9	1	0	0	15	6	6	4	8	0	0	1	84	0	3.80	3.38	1.13	1.69	10.7	9.5	1.08	.175	2.53	6.33
15	Jim Lonborg J. Lonborg	2.63	24.0	1967	World Series	BOS	3	2	1	.667	3	11	2	1	0	14	7	8	3	2	0	0	0	89	1	4.13	0.75	5.50	1.13	12.4	2.2	0.67	.151	3.00	5.25
16	Mudcat Grant M. Grant	2.74	23.0	1965	World Series	MIN	3	2	1	.667	3	12	2	0	0	22	7	8	3	2	0	0	0	92	1	4.70	0.78	6.00	1.17	13.0	2.2	1.04	.253	3.13	8.61
17	Bob Gibson B. Gibson	3.00	27.0	1964	World Series	STL	3	2	1	.667	3	31	2	0	0	23	9	11	4	8	2	0	2	113	1	10.33	2.67	3.88	1.33	27.4	7.1	1.15	.279	3.67	7.67
18	Mel Stottlemyre M. Stottlemyre	3.15	20.0	1964	World Series	NYY	3	1	1	.500	3	12	1	0	0	18	7	8	0	6	0	0	0	84	0	5.40	2.70	2.00	0.00	14.3	7.1	1.20	.273	3.60	8.10
19	Luis Tiant L. Tiant	3.60	25.0	1975	World Series	BOS	3	2	0	1.000	3	12	2	1	0	25	10	10	1	8	0	0	2	107	0	4.32	2.88	1.50	0.36	11.2	7.5	1.32	.279	3.60	9.00
20	Lew Burdette L. Burdette	5.64	22.1	1958	World Series	MIL	3	1	2	.333	3	12	1	0	0	22	14	17	5	4	0	0	3	93	0	4.84	1.61	3.00	2.01	12.9	4.3	1.16	.236	6.85	8.87