Since 1920, Pete Donohue has the fewest home runs allowed / 9 when pitching at least 2000 innings, with 7.44.

Interpreted as:

lowest hr/9 by a player since 1920 with 2000+ ip

	NAME	HR/9	IP	HR	G	W	L	W%	GS	ERA	SO	CG	SHO	SV	H	ER	R	BB	HBP	GF	IBB	TBF	WP	K/9	BB/9	K/BB	K%	BB%	WHIP	BABIP	RA	ERA-	FIP	FIP-	H/9	PRAA
1	Pete Donohue P. Donohue	7.44	2112.1	67	344	134	118	.532	267	3.87	571	138	16	14	2,439	909	1,082	422	46	56		9,055	10	2.43	1.80	1.35	6.3	4.7	1.35	.298	4.61	98	3.58	91	10.39	79.9
2	Jack Quinn J. Quinn	8.11	2299.0	73	498	148	130	.532	258	3.51	659	124	19	51	2,613	897	1,107	507	50	155		9,864	33	2.58	1.98	1.30	6.7	5.1	1.36	.296	4.33	85	3.57	87	10.23	136.4
3	Eppa Rixey E. Rixey	8.67	3175.0	78	481	190	170	.528	391	3.34	769	205	23	10	3,403	1,178	1,441	672	48	71		13,302	47	2.18	1.90	1.14	5.8	5.1	1.28	.283	4.08	87	3.53	91	9.65	118.5
4	Jack Russell J. Russell	9.22	2050.2	83	557	85	141	.376	182	4.46	418	71	3	39	2,454	1,017	1,187	571	26	209		9,020	22	1.83	2.51	0.73	4.6	6.3	1.48	.299	5.21	104	4.07	96	10.77	34.5
5	Van Mungo V. Mungo	9.89	2113.0	89	364	120	115	.511	259	3.47	1,242	123	20	16	1,957	815	955	868	33	61		9,030	52	5.29	3.70	1.43	13.8	9.6	1.34	.275	4.07	91	3.60	92	8.34	74.7
6	Howard Ehmke H. Ehmke	10.33	2275.0	93	336	136	138	.496	276	3.85	828	162	14	13	2,341	972	1,164	807	121	44		9,838	17	3.28	3.19	1.03	8.4	8.2	1.38	.281	4.60	93	4.01	98	9.26	18.2
7	Red Faber R. Faber	10.33	2909.1	93	467	172	158	.521	349	3.44	959	196	18	16	3,042	1,112	1,344	836	57	82		12,355	35	2.97	2.59	1.15	7.8	6.8	1.33	.283	4.16	84	3.70	91	9.41	112.9
8	Firpo Marberry F. Marberry	10.67	2067.1	96	551	148	88	.627	186	3.63	822	86	7	99	2,049	834	971	686	38	272		8,759	14	3.58	2.99	1.20	9.4	7.8	1.32	.274	4.23	86	3.92	94	8.92	55
9	Johnny Vander Meer J. Vander Meer	11.11	2104.2	100	346	119	121	.496	286	3.44	1,294	131	29	2	1,799	805	915	1,132	21	28		9,034	37	5.53	4.84	1.14	14.3	12.5	1.39	.262	3.91	94	3.64	98	7.69	11.3
10	Denny Galehouse D. Galehouse	11.44	2004.0	103	375	109	118	.480	258	3.97	851	100	17	13	2,148	885	999	735	18	67		8,688	29	3.82	3.30	1.16	9.8	8.5	1.44	.293	4.49	95	3.64	89	9.65	101
11	Claude Passeau C. Passeau	11.67	2719.2	105	444	162	150	.519	331	3.32	1,104	188	26	21	2,856	1,003	1,204	728	39	85		11,642	22	3.65	2.41	1.52	9.5	6.3	1.32	.285	3.98	88	3.27	86	9.45	169.9
12	Fritz Ostermueller F. Ostermueller	11.67	2066.2	105	390	114	115	.498	246	3.99	774	112	11	15	2,170	917	1,062	835	21	86		9,116	60	3.37	3.64	0.93	8.5	9.2	1.45	.280	4.62	92	3.94	92	9.45	79.2
13	Larry Benton L. Benton	12	2297.0	108	455	128	128	.500	261	4.03	670	123	13	20	2,559	1,029	1,190	691	25	113		9,864	47	2.63	2.71	0.97	6.8	7.0	1.41	.293	4.66	103	4.01	101	10.03	-15.4
14	Dolf Luque D. Luque	12.22	3017.2	110	504	178	172	.509	346	3.25	1,060	190	23	26	3,047	1,089	1,325	842	23	110		12,632	44	3.16	2.51	1.26	8.4	6.7	1.29	.277	3.95	85	3.66	95	9.09	63.8
15	Dizzy Trout D. Trout	12.44	2725.2	112	521	170	161	.514	322	3.23	1,256	158	28	38	2,641	979	1,166	1,046	34	134	0	11,615	50	4.15	3.45	1.20	10.8	9.0	1.35	.276	3.85	81	3.34	85	8.72	179
16	Danny MacFayden D. MacFayden	12.44	2706.0	112	465	132	159	.454	334	3.96	797	158	18	9	2,981	1,191	1,394	872	64	75		11,767	20	2.65	2.90	0.91	6.8	7.4	1.42	.289	4.64	100	4.07	102	9.91	-29.8
17	Milt Gaston M. Gaston	12.67	2105.0	114	355	97	164	.372	269	4.55	615	128	10	8	2,338	1,064	1,277	836	24	63		9,271	78	2.63	3.57	0.74	6.6	9.0	1.51	.290	5.46	105	4.43	103	10.00	-27.3
18	Rip Sewell R. Sewell	12.89	2119.1	116	390	143	97	.596	243	3.48	636	137	20	15	2,101	819	983	748	23	89		9,100	30	2.70	3.18	0.85	7.0	8.2	1.34	.262	4.17	92	3.79	100	8.92	3.5
19	Grover Alexander G. Alexander	12.89	2437.0	116	334	165	108	.604	293	3.09	659	194	20	16	2,568	838	1,006	355	15	31		10,002	18	2.43	1.31	1.86	6.6	3.5	1.20	.277	3.72	78	3.51	88	9.48	124.2
20	Herb Pennock H. Pennock	12.89	2932.1	116	477	203	134	.602	358	3.63	934	216	25	29	3,281	1,184	1,400	681	22	82		12,480	44	2.87	2.09	1.37	7.5	5.5	1.35	.295	4.30	90	3.62	91	10.07	119.6
21	Urban Shocker U. Shocker	13	2148.2	117	330	156	93	.627	261	3.34	753	168	22	22	2,256	797	946	484	26	53		9,020	10	3.15	2.03	1.56	8.3	5.4	1.28	.280	3.96	80	3.71	90	9.45	102.2
22	Willis Hudlin W. Hudlin	13.11	2613.1	118	491	158	156	.503	328	4.41	677	155	11	31	3,011	1,281	1,493	846	44	105		11,522	41	2.33	2.91	0.80	5.9	7.3	1.48	.294	5.14	98	4.16	94	10.37	75.5
23	George Uhle G. Uhle	13.11	2992.2	118	487	190	161	.541	356	4.04	1,085	225	20	27	3,288	1,343	1,583	923	106	104		13,053	55	3.26	2.78	1.18	8.3	7.1	1.41	.293	4.76	96	3.87	92	9.89	118.9
24	Tom Zachary T. Zachary	13.11	3056.2	118	514	183	186	.496	399	3.74	710	185	24	23	3,503	1,270	1,517	887	40	75		13,177	36	2.09	2.61	0.80	5.4	6.7	1.44	.296	4.47	94	3.98	100	10.31	-7
25	Harry Gumbert H. Gumbert	13.33	2156.0	120	508	143	113	.559	235	3.68	709	96	13	46	2,186	882	1,012	721	23	179		9,217	40	2.96	3.01	0.98	7.7	7.8	1.35	.270	4.22	98	3.85	100	9.13	-1.3