Old Hoss Radbourn has the lowest ERA- - 100 * total batters faced in a season, with -138,281.86 in 1884.

Interpreted as:

least (era- minus 100)*tbf by a player in a season

	NAME	(ERA--100)*TBF	ERA-	TBF	SEASON	TM	G	W	L	W%	GS	ERA	SO	CG	SHO	SV	IP	H	ER	R	HR	BB	HBP	GF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	FIP	FIP-	H/9	PRAA
1	Old Hoss Radbourn O. Hoss Radbourn	-138,281.86	48	2,672	1884	PRO	75	59	12	.831	73	1.38	441	73	11	2	678.2	528	104	216	18	98		2	34	5.85	1.30	4.50	0.24	16.5	3.7	0.92		2.86	2.75	84	7.00	31.9
2	Guy Hecker G. Hecker	-114,997.95	57	2,649	1884	LOU	75	52	20	.722	73	1.80	385	72	6	0	670.2	526	134	230	4	56	16	2	27	5.17	0.75	6.88	0.05	14.5	2.1	0.87	.239	3.09	2.53	80	7.06	43
3	Silver King S. King	-114,861.22	50	2,291	1888	STL	66	45	20	.692	64	1.63	258	64	6	0	584.2	435	106	203	6	76	30	1	23	3.97	1.17	3.39	0.09	11.3	3.3	0.87	.223	3.12	2.38	76	6.70	55
4	Jim Devlin J. Devlin	-98,683.69	62	2,568	1876	LOU	68	30	35	.462	68	1.56	122	66	5	0	622.0	566	108	309	3	37		0	14	1.77	0.54	3.30	0.04	4.8	1.4	0.97		4.47	2.08	82	8.19	50.7
5	John Clarkson J. Clarkson	-96,108.66	61	2,487	1885	CWS	70	53	16	.768	70	1.85	308	68	10	0	623.0	497	128	255	21	97		0	14	4.45	1.40	3.18	0.30	12.4	3.9	0.95		3.68	2.80	86	7.18	38.8
6	George Bradley G. Bradley	-95,943.33	58	2,269	1876	STL	64	45	19	.703	64	1.23	103	63	16	0	573.0	470	78	229	3	38		0	34	1.62	0.60	2.71	0.05	4.5	1.7	0.89		3.60	2.14	101	7.38	-20.7
7	John Clarkson J. Clarkson	-93,526.88	65	2,641	1889	BSN	73	49	19	.721	72	2.73	284	68	8	1	620.0	589	188	280	16	203	17	1	16	4.12	2.95	1.40	0.23	10.8	7.7	1.28	.270	4.06	3.49	82	8.55	56.6
8	Pud Galvin P. Galvin	-90,927.24	64	2,554	1884	BUF	72	46	22	.676	72	1.99	369	71	12	0	636.1	566	141	254	23	63		0	16	5.22	0.89	5.86	0.33	14.4	2.5	0.99		3.59	2.88	82	8.01	50.9
9	Amos Rusie A. Rusie	-89,402.24	53	1,910	1894	NYG	54	36	13	.735	50	2.78	195	45	3	1	444.0	426	137	228	10	200	5	4	10	3.95	4.05	0.98	0.20	10.2	10.5	1.41	.277	4.62	4.61	88	8.64	28.2
10	Will White W. White	-86,657.76	63	2,367	1883	CIN	65	43	22	.662	65	2.09	141	64	6	0	577.0	473	134	255	16	104		0	25	2.20	1.62	1.36	0.25	6.0	4.4	1.00		3.98	3.66	111	7.38	-23.9
11	Dave Foutz D. Foutz	-84,844.5	59	2,091	1886	SLA	59	41	16	.719	57	2.11	283	55	11	1	504.0	418	118	216	5	144	10	2	23	5.05	2.57	1.97	0.09	13.5	6.9	1.12	.250	3.86	3.02	86	7.46	31.1
12	Will White W. White	-84,382.88	57	1,975	1882	CIN	54	40	12	.769	54	1.54	122	52	8	0	480.0	411	82	164	3	71		0	19	2.29	1.33	1.72	0.06	6.2	3.6	1.00		3.08	2.78	99	7.71	1.7
13	Walter Johnson W. Johnson	-82,449.2	42	1,413	1912	WSH	50	33	12	.733	37	1.39	303	34	7	2	369.0	259	57	89	2	76	16	13	11	7.39	1.85	3.99	0.05	21.4	5.4	0.91	.253	2.17	2.03	63	6.32	49.6
14	Grover Alexander G. Alexander	-81,599.94	43	1,435	1915	PHN	49	31	10	.756	42	1.22	241	36	12	3	376.1	253	51	86	3	64	10	7	2	5.76	1.53	3.77	0.07	16.8	4.5	0.84	.224	2.06	1.82	63	6.05	44.1
15	Old Hoss Radbourn O. Hoss Radbourn	-81,016.03	68	2,540	1883	PRO	76	48	25	.658	68	2.05	315	66	4	1	632.1	563	144	275	7	56		8	36	4.48	0.80	5.63	0.10	12.4	2.2	0.98		3.91	2.67	88	8.01	17.8
16	Cy Young C. Young	-80,139.71	44	1,440	1901	BSA	43	33	10	.767	41	1.62	158	38	5	0	371.1	324	67	112	6	37	7	2	2	3.83	0.90	4.27	0.15	11.0	2.6	0.97	.258	2.71	2.64	72	7.85	42.6
17	Cy Young C. Young	-79,484.6	57	1,847	1892	CLE	53	36	12	.750	49	1.93	168	48	9	0	453.0	363	97	158	8	118	8	4	13	3.34	2.34	1.42	0.16	9.1	6.4	1.06	.230	3.14	2.76	82	7.21	33.4
18	Charlie Sweeney C. Sweeney	-79,408.92	58	1,909	1884	TOT	60	41	15	.732	56	1.70	337	53	6	1	492.0	360	93	182	6	42		4	21	6.16	0.77	8.02	0.11	17.7	2.2	0.82		3.33	2.32	81	6.59	26.9
19	Mickey Welch M. Welch	-79,113.57	60	1,963	1885	NYG	56	44	11	.800	55	1.66	258	55	7	1	492.0	372	91	170	4	131		1	39	4.72	2.40	1.97	0.07	13.1	6.7	1.02		3.11	2.74	91	6.80	13
20	Walter Johnson W. Johnson	-77,447.51	39	1,271	1913	WSH	48	36	7	.837	36	1.14	243	29	11	2	346.0	232	44	56	9	38	9	10	2	6.32	0.99	6.39	0.23	19.1	3.0	0.78	.229	1.46	1.90	63	6.03	42.3
21	Billy Taylor B. Taylor	-75,028.84	66	2,195	1884	TOT	63	43	16	.729	59	2.10	284	59	3	4	523.0	454	122	215	5	84	12	4	32	4.89	1.45	3.38	0.09	12.9	3.8	1.03	.248	3.70	2.86	98	7.81	5.1
22	Billy Rhines B. Rhines	-74,876.09	55	1,656	1890	CIN	46	28	17	.622	45	1.95	182	45	6	0	401.1	337	87	163	6	113	15	1	14	4.08	2.53	1.61	0.13	11.0	6.8	1.12	.247	3.66	3.16	83	7.56	29.2
23	Christy Mathewson C. Mathewson	-74,770.36	42	1,294	1905	NYG	43	31	9	.775	37	1.28	206	32	8	3	338.2	252	48	85	4	64	1	6	6	5.47	1.70	3.22	0.11	15.9	4.9	0.93	.243	2.26	2.03	69	6.70	34.9
24	Bob Caruthers B. Caruthers	-74,059.66	62	1,948	1885	SLA	53	40	13	.755	53	2.07	190	53	6	0	482.1	430	111	196	3	57	19	0	25	3.55	1.06	3.33	0.06	9.8	2.9	1.01	.254	3.66	2.65	85	8.02	28.7
25	Silver King S. King	-73,398.63	63	1,988	1890	CHP	56	30	22	.577	56	2.69	185	48	4	0	461.0	420	138	233	5	163	15	0	11	3.61	3.18	1.13	0.10	9.3	8.2	1.26	.256	4.55	3.41	80	8.20	43.3