Trevor Hoffman allowed the fewest H/9 by a pitcher older than 28 with more than 20.0 innings pitched in 1998, with 5.05 per nine innings.

Interpreted as:

lowest h/9 by a player 1998 >20 ip >28 years old

	NAME	H/9	IP	AGE	SEASON	TM	G	W	L	W%	GS	ERA	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	ERA-	FIP	FIP-	PRAA
1	Trevor Hoffman T. Hoffman	5.05	73.0	30	1998	SDP	66	4	2	.667	0	1.48	86	0	0	53	41	12	12	2	21	1	61	2	274	8	10.60	2.59	4.10	0.25	31.4	7.7	0.85	.238	1.48	37	2.04	49	17.8
2	Michael Jackson M. Jackson	6.05	64.0	33	1998	CLE	69	1	1	.500	0	1.55	55	0	0	40	43	11	11	4	13	4	57	0	239	1	7.73	1.83	4.23	0.56	23.0	5.4	0.88	.239	1.55	33	3.02	66	11
3	Graeme Lloyd G. Lloyd	6.21	37.2	31	1998	NYY	50	3	0	1.000	0	1.67	20	0	0	0	26	7	10	3	6	2	8	2	145	2	4.78	1.43	3.33	0.72	13.8	4.1	0.85	.202	2.39	37	3.74	83	3.3
4	Tom Gordon T. Gordon	6.24	79.1	30	1998	BOS	73	7	4	.636	0	2.72	78	0	0	46	55	24	24	2	25	0	69	1	317	9	8.85	2.84	3.12	0.23	24.6	7.9	1.01	.250	2.72	57	2.44	54	18.2
5	Rudy Seanez R. Seanez	6.25	36.0	29	1998	ATL	34	4	1	.800	0	2.75	50	0	0	2	25	11	13	2	16	1	8	0	148	2	12.50	4.00	3.13	0.50	33.8	10.8	1.14	.291	3.25	66	2.49	59	7.1
6	Steve Reed S. Reed	6.27	80.1	33	1998	TOT	70	4	3	.571	0	3.14	73	0	0	1	56	28	29	8	27	5	19	5	322	0	8.18	3.02	2.70	0.90	22.7	8.4	1.03	.230	3.25	70	3.80	87	5
7	Donne Wall D. Wall	6.40	70.1	30	1998	SDP	46	5	4	.556	1	2.43	56	0	0	1	50	19	20	6	32	1	14	2	287	3	7.17	4.09	1.75	0.77	19.5	11.1	1.17	.229	2.56	61	4.06	97	0.8
8	Alan Mills A. Mills	6.43	77.0	31	1998	BAL	72	3	4	.429	0	3.74	57	0	0	2	55	32	32	8	50	1	13	8	327	4	6.66	5.84	1.14	0.94	17.4	15.3	1.36	.223	3.74	83	4.99	109	-3.6
9	Roger Clemens R. Clemens	6.48	234.2	35	1998	TOR	33	20	6	.769	33	2.65	271	5	3	0	169	69	78	11	88	7	0	0	961	6	10.39	3.38	3.08	0.42	28.2	9.2	1.10	.271	2.99	57	2.65	59	49.2
10	Jeff Tabaka J. Tabaka	6.57	50.2	34	1998	PIT	37	2	2	.500	0	3.02	40	0	0	0	37	17	19	6	22	5	9	4	212	1	7.11	3.91	1.82	1.07	18.9	10.4	1.16	.223	3.38	71	4.69	110	-2.5
11	Xavier Hernandez X. Hernandez	6.67	58.0	32	1998	TEX	46	6	6	.500	0	3.57	41	0	0	1	43	23	27	5	30	1	15	1	243	4	6.36	4.66	1.37	0.78	16.9	12.3	1.26	.229	4.19	74	4.44	95	1.4
12	Ramon Martinez R. Martinez	6.73	101.2	30	1998	LAD	15	7	3	.700	15	2.83	91	1	0	0	76	32	41	8	41	3	0	1	418	2	8.06	3.63	2.22	0.71	21.8	9.8	1.15	.247	3.63	72	3.66	87	6.3
13	Stan Belinda S. Belinda	6.75	61.1	31	1998	CIN	40	4	8	.333	0	3.23	57	0	0	1	46	22	23	7	28	1	24	6	254	3	8.36	4.11	2.04	1.03	22.4	11.0	1.21	.242	3.38	75	4.18	95	1.5
14	Doug Brocail D. Brocail	6.75	62.2	31	1998	DET	60	5	2	.714	0	2.73	55	0	0	0	47	19	23	2	18	1	24	3	247	6	7.90	2.59	3.06	0.29	22.3	7.3	1.04	.263	3.30	58	2.70	57	13.6
15	Mark Leiter M. Leiter	6.80	88.2	35	1998	PHI	69	7	5	.583	0	3.55	84	0	0	23	67	35	36	8	47	8	50	5	378	5	8.53	4.77	1.79	0.81	22.2	12.4	1.29	.255	3.65	83	4.27	100	-0.2
16	John Wetteland J. Wetteland	6.82	62.0	31	1998	TEX	63	3	1	.750	0	2.03	72	0	0	42	47	14	17	6	14	0	59	1	249	1	10.45	2.03	5.14	0.87	28.9	5.6	0.98	.261	2.47	42	2.74	59	13
17	Mike Williams M. Williams	6.88	51.0	29	1998	PIT	37	4	2	.667	1	1.94	59	0	0	0	39	11	12	1	16	0	9	4	204	3	10.41	2.82	3.69	0.18	28.9	7.8	1.08	.297	2.12	45	2.01	47	12.8
18	Yorkis Perez Y. Perez	6.92	52.0	30	1998	PHI	57	0	2	.000	0	3.81	42	0	0	0	40	22	23	3	25	0	7	0	221	7	7.27	4.33	1.68	0.52	19.0	11.3	1.25	.245	3.98	89	3.71	87	3.2
19	Roberto Hernandez R. Hernandez	6.94	71.1	33	1998	TBD	67	2	6	.250	0	4.04	55	0	0	26	55	32	33	5	41	5	58	4	310	1	6.94	5.17	1.34	0.63	17.7	13.2	1.35	.245	4.16	86	4.44	97	1
20	Greg McCarthy G. McCarthy	6.94	23.1	29	1998	SEA	29	1	2	.333	0	5.01	25	0	0	0	18	13	13	6	17	3	5	2	106	1	9.64	6.56	1.47	2.31	23.6	16.0	1.50	.218	5.01	108	6.90	150	-5.9
21	Jerry Spradlin J. Spradlin	6.94	81.2	31	1998	PHI	69	4	4	.500	0	3.53	76	0	0	1	63	32	34	9	20	2	20	1	319	6	8.38	2.20	3.80	0.99	23.8	6.3	1.02	.255	3.75	83	3.51	82	6.8
22	Doug Henry D. Henry	6.97	71.0	34	1998	HOU	59	8	2	.800	0	3.04	59	0	0	2	55	24	25	9	35	0	25	5	296	7	7.48	4.44	1.69	1.14	19.9	11.8	1.27	.238	3.17	77	4.60	114	-4.8
23	John Hudek J. Hudek	7.03	64.0	31	1998	TOT	58	5	6	.455	0	3.09	68	0	0	0	50	22	27	8	47	4	23	4	289	1	9.56	6.61	1.45	1.13	23.5	16.3	1.52	.259	3.80	74	5.02	117	-5.1
24	Rich DeLucia R. DeLucia	7.03	71.2	33	1998	ANA	61	2	6	.250	0	4.27	73	0	0	3	56	34	36	10	46	3	18	5	314	8	9.17	5.78	1.59	1.26	23.2	14.6	1.42	.253	4.52	92	4.96	108	-2.7
25	Al Leiter A. Leiter	7.04	193.0	32	1998	NYM	28	17	6	.739	28	2.47	174	4	2	0	151	53	55	8	71	11	0	2	789	4	8.11	3.31	2.45	0.37	22.1	9.0	1.15	.272	2.56	61	3.14	75	22.5