highest tbf per earned runs by a pitcher in mlb history with at least 20000 tbf

Walter Johnson has the most career total batters faced per earned run when facing 20,000+ batters, with 16.44.

	NAME	TBF/ER	TBF	ER	G	W	L	W%	GS	ERA	SO	CG	SHO	SV	IP	H	R	HR	BB	HBP	GF	IBB	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	ERA-	FIP	FIP-	H/9	PRAA
1	Walter Johnson W. Johnson	16.44	23,405	1,424	802	417	279	.599	666	2.17	3,509	531	110	34	5914.1	4,913	1,902	97	1,363	205	127		154	5.34	2.07	2.57	0.15	15.0	5.8	1.06	.264	2.89	68	2.42	76	7.48	472.8
2	Tim Keefe T. Keefe	14.21	20,941	1,474	600	342	225	.603	594	2.63	2,564	554	39	2	5049.2	4,438	2,470	75	1,233	83	7		240	4.57	2.20	2.08	0.13	12.2	5.9	1.12	.257	4.40	79	2.92	87	7.91	239.2
3	Grover Alexander G. Alexander	14.16	20,893	1,476	696	373	208	.642	600	2.56	2,198	436	90	32	5190.0	4,868	1,852	165	951	70	81		38	3.81	1.65	2.31	0.29	10.5	4.6	1.12	.269	3.21	73	2.88	81	8.44	359.1
4	Mickey Welch M. Welch	14.03	20,308	1,447	565	307	210	.594	549	2.71	1,850	525	41	4	4802.0	4,588	2,556	106	1,297	52	16		274	3.47	2.43	1.43	0.20	9.1	6.4	1.23	.264	4.79	88	3.28	103	8.60	-55.7
5	Cy Young C. Young	13.77	29,565	2,147	906	511	316	.618	815	2.63	2,803	749	76	17	7356.0	7,092	3,167	138	1,217	161	84		156	3.43	1.49	2.30	0.17	9.5	4.1	1.13	.275	3.87	74	2.84	79	8.68	620
6	Pud Galvin P. Galvin	13.28	25,160	1,895	697	361	308	.540	681	2.87	1,799	639	57	1	5941.1	6,352	3,315	121	744	54	18		220	2.73	1.13	2.42	0.18	7.2	3.0	1.19	.278	5.02	94	2.97	95	9.62	94.5
7	Kid Nichols K. Nichols	12.67	21,082	1,664	621	361	208	.634	562	2.96	1,881	532	48	17	5067.1	4,929	2,480	156	1,272	129	56		169	3.34	2.26	1.48	0.28	8.9	6.0	1.22	.271	4.40	73	3.48	85	8.75	377.8
8	Warren Spahn W. Spahn	11.98	21,547	1,798	750	363	245	.597	665	3.09	2,583	382	63	28	5243.2	4,830	2,016	434	1,434	42	67	60	81	4.43	2.46	1.80	0.74	12.0	6.7	1.19	.258	3.46	84	3.44	94	8.29	124.4
9	Gaylord Perry G. Perry	11.89	21,953	1,846	777	314	265	.542	690	3.11	3,534	303	53	10	5350.0	4,938	2,128	399	1,379	108	33	164	160	5.95	2.32	2.56	0.67	16.1	6.3	1.18	.275	3.58	85	3.06	85	8.31	312.9
10	Roger Clemens R. Clemens	11.86	20,240	1,707	709	354	184	.658	707	3.12	4,672	118	46	0	4916.2	4,185	1,885	363	1,580	159	0	63	143	8.55	2.89	2.96	0.66	23.1	7.8	1.17	.284	3.45	70	3.08	71	7.66	680.4
11	Nolan Ryan N. Ryan	11.81	22,575	1,911	807	324	292	.526	773	3.19	5,714	222	61	3	5386.0	3,923	2,178	321	2,795	158	13	78	277	9.55	4.67	2.04	0.54	25.3	12.4	1.25	.265	3.64	90	2.96	83	6.56	370.2
12	Steve Carlton S. Carlton	11.63	21,683	1,864	741	329	244	.574	709	3.22	4,136	254	55	2	5217.2	4,672	2,130	414	1,833	53	13	150	183	7.13	3.16	2.26	0.71	19.1	8.5	1.25	.279	3.67	87	3.14	86	8.06	271.5
13	Greg Maddux G. Maddux	11.63	20,421	1,756	744	355	227	.610	740	3.16	3,371	109	35	0	5008.1	4,726	1,981	353	999	137	3	177	70	6.06	1.80	3.37	0.63	16.5	4.9	1.14	.281	3.56	76	3.25	78	8.49	519.5
14	Don Sutton D. Sutton	11.3	21,631	1,914	774	324	256	.559	756	3.26	3,574	178	58	5	5282.1	4,692	2,104	472	1,343	82	12	102	112	6.09	2.29	2.66	0.80	16.5	6.2	1.14	.261	3.58	92	3.23	90	7.99	181.2
15	Phil Niekro P. Niekro	11.27	22,677	2,012	864	318	274	.537	716	3.35	3,342	245	45	29	5404.0	5,044	2,337	482	1,809	123	83	86	226	5.57	3.01	1.85	0.80	14.7	8.0	1.27	.270	3.89	87	3.61	95	8.40	116.1
16	Bert Blyleven B. Blyleven	11.2	20,491	1,830	692	287	250	.534	685	3.31	3,701	242	60	0	4970.0	4,632	2,029	430	1,322	155	3	71	114	6.70	2.39	2.80	0.78	18.1	6.5	1.20	.282	3.67	85	3.18	82	8.39	368.6