Yusei Kikuchi has the most home runs allowed / 9 by a rookie, with 4 in 2019.

	NAME	HR/9	HR	SEASON	TM	G	W	L	W%	GS	ERA	SO	CG	SHO	SV	IP	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	Yusei Kikuchi Y. Kikuchi	4	36	2019	SEA	32	6	11	.353	32	5.46	116	1	1	0	161.2	195	98	109	50	6	0	0	721	5	6.46	2.78	2.32	16.1	6.9	1.52	.310	6.07	123	5.70	127	10.86	-22.7
2	Tarik Skubal T. Skubal	3.89	35	2021	DET	31	8	12	.400	29	4.34	164	0	0	0	149.1	141	72	76	47	6	1	0	634	4	9.88	2.83	3.49	25.9	7.4	1.26	.277	4.58	100	5.08	120	8.50	-14.2
3	Jerry Garvin J. Garvin	3.67	33	1977	TOR	34	10	18	.357	34	4.19	127	12	1	0	244.2	247	114	127	85	4	0	5	1,046	2	4.67	3.13	1.49	12.1	8.1	1.36	.269	4.67	99	4.53	110	9.09	-10.3
4	Rob Bell R. Bell	3.56	32	2000	CIN	26	7	8	.467	26	5.00	112	1	0	0	140.1	130	78	84	73	1	0	6	618	11	7.18	4.68	1.53	18.1	11.8	1.45	.245	5.39	106	6.08	125	8.34	-18.4
5	Jason Dickson J. Dickson	3.56	32	1997	ANA	33	13	9	.591	32	4.29	115	2	1	0	203.2	236	97	111	56	7	1	3	888	4	5.08	2.47	2.05	13.0	6.3	1.43	.301	4.91	95	4.94	108	10.43	-8.2
6	Brad Radke B. Radke	3.56	32	1995	MIN	29	11	14	.440	28	5.32	75	2	1	0	181.0	195	107	112	47	4	0	0	772	4	3.73	2.34	1.60	9.7	6.1	1.34	.265	5.57	111	5.41	116	9.70	-14.8
7	Eric Bell E. Bell	3.56	32	1987	BAL	33	10	13	.435	29	5.45	111	2	0	0	165.0	174	100	113	78	2	1	0	729	11	6.05	4.25	1.42	15.2	10.7	1.53	.281	6.16	124	5.49	122	9.49	-17.8
8	Bill Wegman B. Wegman	3.56	32	1986	MIL	35	5	12	.294	32	5.13	82	2	0	0	198.1	217	113	120	43	7	1	2	836	5	3.72	1.95	1.91	9.8	5.1	1.31	.275	5.45	122	4.79	116	9.85	-15.1
9	Javier Vazquez J. Vazquez	3.44	31	1998	MON	33	5	15	.250	32	6.06	139	0	0	0	172.1	196	116	121	68	11	1	2	764	2	7.26	3.55	2.04	18.2	8.9	1.53	.320	6.32	143	5.23	122	10.24	-17.8
10	Rich DeLucia R. DeLucia	3.44	31	1991	SEA	32	12	13	.480	31	5.09	98	0	0	0	182.0	176	103	107	78	4	0	4	779	10	4.85	3.86	1.26	12.6	10.0	1.40	.255	5.29	123	5.34	132	8.70	-26.2
11	Buster Narum B. Narum	3.44	31	1964	WSH	38	9	15	.375	32	4.30	121	7	2	0	199.0	195	95	104	73	5	3	4	845	7	5.47	3.30	1.66	14.3	8.6	1.35	.267	4.70	119	4.59	122	8.82	-18.1
12	Bill Voiselle B. Voiselle	3.44	31	1944	NYG	43	21	16	.568	41	3.02	161	25	1	0	312.2	276	105	138	118	4	1		1,327	7	4.63	3.40	1.36	12.1	8.9	1.26	.242	3.97	82	3.97	107	7.94	-9
13	Glenn Sparkman G. Sparkman	3.33	30	2019	KCR	31	4	11	.267	23	6.02	81	1	1	0	136.0	164	91	96	41	6	2	1	606	6	5.36	2.71	1.98	13.4	6.8	1.51	.299	6.35	128	5.92	132	10.85	-22.4
14	Merrill Kelly M. Kelly	3.22	29	2019	ARI	32	13	14	.481	32	4.42	158	0	0	0	183.1	184	90	95	57	2	0	4	777	4	7.76	2.80	2.77	20.3	7.3	1.31	.292	4.66	100	4.50	104	9.03	-3.6
15	Adrian Sampson A. Sampson	3.22	29	2019	TEX	35	6	8	.429	15	5.89	101	1	0	0	125.1	156	82	86	36	9	4	1	563	4	7.25	2.59	2.81	17.9	6.4	1.53	.327	6.18	117	5.68	120	11.20	-12.2
16	Wei-Yin Chen W. Chen	3.22	29	2012	BAL	32	12	11	.522	32	4.02	154	0	0	0	192.2	186	86	97	57	5	0	0	818	2	7.19	2.66	2.70	18.8	7.0	1.26	.274	4.53	97	4.41	103	8.69	-2.1
17	Johnny Cueto J. Cueto	3.22	29	2008	CIN	31	9	14	.391	31	4.81	158	0	0	0	174.0	178	93	101	68	14	0	1	769	6	8.17	3.52	2.32	20.5	8.8	1.41	.298	5.22	109	4.89	110	9.21	-8.1
18	Don Wengert D. Wengert	3.22	29	1996	OAK	36	7	11	.389	25	5.58	75	1	1	0	161.1	200	100	102	60	6	2	5	725	4	4.18	3.35	1.25	10.3	8.3	1.61	.308	5.69	115	5.80	119	11.16	-17
19	Tom Browning T. Browning	3.22	29	1985	CIN	38	20	9	.690	38	3.55	155	6	4	0	261.1	242	103	111	73	3	0	8	1,083	2	5.34	2.51	2.12	14.3	6.7	1.21	.259	3.82	95	3.81	102	8.33	-1.9
20	Jerry Ujdur J. Ujdur	3.22	29	1982	DET	25	10	10	.500	25	3.69	86	7	0	0	178.0	150	73	76	69	3	0	4	732	5	4.35	3.49	1.25	11.7	9.4	1.23	.222	3.84	92	5.07	121	7.58	-17.1
21	JT Brubaker	3.11	28	2021	PIT	24	5	13	.278	24	5.36	129	0	0	0	124.1	123	74	75	38	9	0	1	538	3	9.34	2.75	3.39	24.0	7.1	1.29	.284	5.43	126	5.15	121	8.90	-12.6
22	Jharel Cotton J. Cotton	3.11	28	2017	OAK	24	9	10	.474	24	5.58	105	0	0	0	129.0	133	80	91	53	4	0	1	566	9	7.33	3.70	1.98	18.6	9.4	1.44	.279	6.35	132	5.67	132	9.28	-20.2
23	Armando Galarraga A. Galarraga	3.11	28	2008	DET	30	13	7	.650	28	3.73	126	0	0	0	178.2	152	74	83	61	6	0	2	746	6	6.35	3.07	2.07	16.9	8.2	1.19	.236	4.18	85	4.88	112	7.66	-10.1
24	John Danks J. Danks	3.11	28	2007	CWS	26	6	13	.316	26	5.50	109	0	0	0	139.0	160	85	92	54	4	0	4	622	3	7.06	3.50	2.02	17.5	8.7	1.54	.309	5.96	119	5.53	119	10.36	-12.6
25	Josh Fogg J. Fogg	3.11	28	2002	PIT	33	12	12	.500	33	4.35	113	0	0	0	194.1	199	94	102	69	8	0	12	832	2	5.23	3.20	1.64	13.6	8.3	1.38	.279	4.72	106	4.85	117	9.22	-15.4