John Rocker and Joe Niekro are tied for the best career ERA in the postseason when pitching at least 20 innings, with an ERA of 0.00.

Interpreted as:

lowest era by a player postseason history min 20 ip

	NAME	ERA	IP	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	John Rocker J. Rocker	0.00	20.2	20	2	0	1.000	0	26	0	0	3	10	0	2	0	8	0	5	2	80	2	11.32	3.48	3.25	0.00	32.5	10.0	0.87	.217	0.87	4.35
2	Joe Niekro J. Niekro	0.00	20.0	3	0	0		2	7	0	0	0	14	0	0	0	5	2	0	1	82	0	3.15	2.25	1.40	0.00	8.5	6.1	0.95	.206	0.00	6.30
3	Dave Dravecky D. Dravecky	0.35	25.2	7	1	1	.500	2	24	1	1	0	12	1	1	0	5	0	1	0	88	0	8.42	1.75	4.80	0.00	27.3	5.7	0.66	.203	0.35	4.21
4	Chad Bradford C. Bradford	0.39	23.1	24	0	0		0	13	0	0	0	18	1	1	0	6	2	2	3	88	0	5.01	2.31	2.17	0.00	14.8	6.8	1.03	.269	0.39	6.94
5	Ken Dayley K. Dayley	0.44	20.2	16	1	0	1.000	0	15	0	0	5	6	1	1	1	6	1	8	0	72	0	6.53	2.61	2.50	0.44	20.8	8.3	0.58	.102	0.44	2.61
6	Mariano Rivera M. Rivera	0.70	141.0	96	8	1	.889	0	110	0	0	42	86	11	13	2	21	3	78	4	527	3	7.02	1.34	5.24	0.13	20.9	4.0	0.76	.215	0.83	5.49
7	Harry Brecheen H. Brecheen	0.83	32.2	7	4	1	.800	3	18	3	1	0	28	3	3	0	12	0	4	3	129	0	4.96	3.31	1.50	0.00	14.0	9.3	1.22	.283	0.83	7.71
8	Claude Osteen C. Osteen	0.86	21.0	3	1	2	.333	3	7	1	1	0	12	2	3	2	6	0	0	0	77	0	3.00	2.57	1.17	0.86	9.1	7.8	0.86	.161	1.29	5.14
9	Jeremy Affeldt J. Affeldt	0.86	31.1	33	2	0	1.000	0	20	0	0	0	14	3	3	1	8	2	4	2	111	2	5.74	2.30	2.50	0.29	18.0	7.2	0.70	.163	0.86	4.02
10	Babe Ruth B. Ruth	0.87	31.0	3	3	0	1.000	3	8	2	1	0	19	3	3	1	10	1	0	0	116	1	2.32	2.90	0.80	0.29	6.9	8.6	0.94	.188	0.87	5.52
11	Sherry Smith S. Smith	0.89	30.1	3	1	2	.333	3	5	3	0	0	17	3	4	0	9	0	0	1	110	0	1.48	2.67	0.56	0.00	4.5	8.2	0.86	.177	1.19	5.04
12	Andrew Miller A. Miller	0.93	38.2	29	2	1	.667	0	54	0	0	1	20	4	4	3	13	3	3	2	148	1	12.57	3.03	4.15	0.70	36.5	8.8	0.85	.227	0.93	4.66
13	Sandy Koufax S. Koufax	0.95	57.0	8	4	3	.571	7	61	4	2	0	36	6	10	2	11	0	0	1	213	0	9.63	1.74	5.55	0.32	28.6	5.2	0.82	.245	1.58	5.68
14	Steve Rogers S. Rogers	0.98	27.2	4	3	1	.750	3	11	2	1	0	24	3	3	2	4	0	1	1	105	1	3.58	1.30	2.75	0.65	10.5	3.8	1.01	.250	0.98	7.81
15	Jonathan Papelbon J. Papelbon	1.00	27.0	18	2	1	.667	0	23	0	0	7	14	3	3	0	8	0	12	3	100	0	7.67	2.67	2.88	0.00	23.0	8.0	0.81	.203	1.00	4.67
16	Hippo Vaughn H. Vaughn	1.00	27.0	3	1	2	.333	3	17	3	1	0	17	3	3	0	5	1	0	1	97	0	5.67	1.67	3.40	0.00	17.5	5.2	0.81	.230	1.00	5.67
17	Monte Pearson M. Pearson	1.01	35.2	4	4	0	1.000	4	28	3	1	0	19	4	5	1	7	0	0	0	133	0	7.07	1.77	4.00	0.25	21.1	5.3	0.73	.186	1.26	4.79
18	Christy Mathewson C. Mathewson	1.06	101.2	11	5	5	.500	11	48	10	4	0	76	12	22	1	10	1	0	3	391	1	4.25	0.89	4.80	0.09	12.3	2.6	0.85	.227	1.95	6.73
19	Norm Charlton N. Charlton	1.08	25.0	17	3	1	.750	0	22	0	0	2	13	3	4	1	9	1	5	1	96	1	7.92	3.24	2.44	0.36	22.9	9.4	0.88	.190	1.44	4.68
20	Blue Moon Odom B. Moon Odom	1.13	39.2	10	3	1	.750	4	27	1	1	0	22	5	7	0	13	0	1	0	150	2	6.13	2.95	2.08	0.00	18.0	8.7	0.88	.200	1.59	4.99
21	Kelvin Herrera K. Herrera	1.26	28.2	22	2	0	1.000	0	38	0	0	0	21	4	5	0	10	0	0	0	115	0	11.93	3.14	3.80	0.00	33.0	8.7	1.08	.313	1.57	6.59
22	Ian Anderson I. Anderson	1.26	35.2	8	4	0	1.000	8	40	0	0	0	20	5	5	1	17	2	0	0	145	1	10.09	4.29	2.35	0.25	27.6	11.7	1.04	.224	1.26	5.05
23	Babe Adams B. Adams	1.29	28.0	4	3	0	1.000	3	11	3	1	0	20	4	5	2	6	1	1	0	111	0	3.54	1.93	1.83	0.64	9.9	5.4	0.93	.198	1.61	6.43
24	Eddie Plank E. Plank	1.32	54.2	7	2	5	.286	6	32	6	0	0	36	8	11	0	11	4	1	1	215	1	5.27	1.81	2.91	0.00	14.9	5.1	0.86	.214	1.81	5.93
25	Clay Holmes C. Holmes	1.35	20.0	19	3	1	.750	0	20	0	0	0	11	3	3	1	7	2	3	0	76	0	9.00	3.15	2.86	0.45	26.3	9.2	0.90	.217	1.35	4.95