Between the 1990 and 1999 seasons, Jeff Zimmerman had the best ERA, with an ERA of 2.36.

Interpreted as:

pitchers with lowest era with a minimum of 0.5 IP per team game in 1990's

	NAME	ERA	G	W	L	W%	GS	SO	CG	SHO	SV	IP	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-	H/9	PRAA
1	Jeff Zimmerman J. Zimmerman	2.36	65	9	3	.750	0	67	0	0	3	87.2	50	23	24	9	23	2	14	1	336	2	6.88	2.36	2.91	0.92	19.9	6.8	0.83	.174	2.46	47	3.78	77	5.13	10.6
2	John Tudor J. Tudor	2.40	25	12	4	.750	22	63	1	1	0	146.1	120	39	48	10	30	2	0	4	575	0	3.87	1.85	2.10	0.62	11.0	5.2	1.03	.234	2.95	63	3.48	92	7.38	4.9
3	Scott Williamson S. Williamson	2.41	62	12	7	.632	0	107	0	0	19	93.1	54	25	29	8	43	1	40	6	366	13	10.32	4.15	2.49	0.77	29.2	11.7	1.04	.222	2.80	52	3.36	71	5.21	13.8
4	Greg Maddux G. Maddux	2.54	331	176	88	.667	331	1,764	75	23	0	2394.2	2,084	677	786	111	443	60	0	74	9,563	32	6.63	1.66	3.98	0.42	18.4	4.6	1.06	.275	2.95	62	2.77	67	7.83	361.6
5	Jose Rijo J. Rijo	2.74	168	72	43	.626	168	955	16	3	0	1111.0	972	338	383	74	313	14	0	10	4,519	10	7.74	2.54	3.05	0.60	21.1	6.9	1.16	.284	3.10	70	2.94	73	7.87	129.7
6	Duane Ward D. Ward	2.83	308	18	22	.450	0	447	0	0	91	410.2	317	129	141	21	144	6	190	18	1,657	27	9.80	3.16	3.10	0.46	27.0	8.7	1.12	.285	3.09	69	2.42	59	6.95	76.3
7	Pedro Martinez P. Martinez	2.83	249	107	50	.682	182	1,534	28	11	3	1359.1	1,050	428	476	107	410	55	23	20	5,477	38	10.16	2.71	3.74	0.71	28.0	7.5	1.07	.280	3.15	65	2.90	68	6.95	213
8	Matt Morris M. Morris	2.97	50	19	14	.576	50	228	5	1	0	330.2	309	109	125	20	111	10	0	8	1,368	8	6.21	3.02	2.05	0.54	16.7	8.1	1.27	.289	3.40	71	3.62	84	8.41	25.6
9	Roger Clemens R. Clemens	3.02	305	152	89	.631	305	2,101	57	24	0	2177.2	1,829	731	813	139	731	82	0	28	8,968	59	8.68	3.02	2.87	0.57	23.4	8.2	1.18	.286	3.36	66	3.02	68	7.56	333
10	Randy Johnson R. Johnson	3.14	298	150	75	.667	290	2,538	65	25	2	2063.1	1,560	721	805	183	910	98	3	13	8,557	65	11.07	3.97	2.79	0.80	29.7	10.6	1.20	.285	3.51	72	3.16	73	6.80	281.4
11	Tom Glavine T. Glavine	3.21	327	164	87	.653	327	1,465	38	14	0	2228.0	2,101	794	877	141	764	23	0	72	9,325	50	5.92	3.09	1.92	0.57	15.7	8.2	1.29	.283	3.54	78	3.58	86	8.49	138.4
12	David Cone D. Cone	3.21	289	141	85	.624	287	1,928	40	16	0	2017.0	1,667	720	792	169	774	73	1	19	8,378	100	8.60	3.45	2.49	0.75	23.0	9.2	1.21	.276	3.53	76	3.43	80	7.44	185.5
13	Ed Whitson E. Whitson	3.22	45	18	15	.545	44	167	8	3	0	307.1	308	110	120	26	64	1	0	11	1,255	3	4.89	1.87	2.61	0.76	13.3	5.1	1.21	.283	3.51	85	3.46	89	9.02	14.7
14	Tim Hudson T. Hudson	3.23	21	11	2	.846	21	132	1	0	0	136.1	121	49	56	8	62	4	0	2	580	6	8.71	4.09	2.13	0.53	22.8	10.7	1.34	.302	3.70	68	3.40	71	7.99	21
15	Kevin Brown K. Brown	3.25	316	143	98	.593	314	1,581	58	16	0	2211.1	2,107	798	917	128	605	103	1	33	9,198	74	6.43	2.46	2.61	0.52	17.2	6.6	1.23	.292	3.73	77	3.30	78	8.58	235.9
16	Curt Schilling C. Schilling	3.31	317	99	79	.556	210	1,561	57	13	13	1668.1	1,451	613	663	148	441	30	60	33	6,802	46	8.42	2.38	3.54	0.80	22.9	6.5	1.13	.282	3.58	80	3.16	77	7.83	175.5
17	John Smoltz J. Smoltz	3.32	315	143	95	.601	315	1,893	42	14	0	2142.1	1,858	791	867	170	669	34	0	49	8,803	109	7.95	2.81	2.83	0.71	21.5	7.6	1.18	.280	3.64	81	3.25	79	7.81	206.5
18	Dennis Martinez D. Martinez	3.37	264	92	70	.568	215	882	36	14	3	1514.2	1,397	567	643	123	410	61	12	34	6,277	17	5.24	2.44	2.15	0.73	14.1	6.5	1.19	.265	3.82	81	3.78	93	8.30	48.9
19	Kevin Millwood K. Millwood	3.37	76	40	18	.690	70	410	5	1	0	453.2	398	170	192	43	136	9	3	6	1,881	12	8.13	2.70	3.01	0.85	21.8	7.2	1.18	.277	3.81	78	3.51	80	7.90	45.6
20	Ismael Valdez I. Valdez	3.38	176	61	54	.530	150	756	10	5	1	1025.0	963	385	427	104	286	15	8	24	4,275	16	6.64	2.51	2.64	0.91	17.7	6.7	1.22	.276	3.75	85	3.85	91	8.46	44
21	Kerry Wood K. Wood	3.40	26	13	6	.684	26	233	1	1	0	166.2	117	63	69	14	85	11	0	1	699	6	12.58	4.59	2.74	0.76	33.3	12.2	1.21	.289	3.73	80	3.16	73	6.32	21.9
22	Randy Tomlin R. Tomlin	3.43	106	30	31	.492	94	297	8	3	0	580.1	590	221	250	37	133	17	1	9	2,399	14	4.61	2.06	2.23	0.57	12.4	5.5	1.25	.289	3.88	93	3.43	93	9.15	16.6
23	Scott Elarton S. Elarton	3.43	70	11	6	.647	17	177	0	0	3	181.0	151	69	76	13	63	5	15	0	751	4	8.80	3.13	2.81	0.65	23.6	8.4	1.18	.280	3.78	82	3.23	76	7.51	21.2
24	Bret Saberhagen B. Saberhagen	3.43	192	74	54	.578	190	835	24	4	0	1218.2	1,193	465	503	110	213	41	0	15	4,982	21	6.17	1.57	3.92	0.81	16.8	4.3	1.15	.286	3.71	81	3.42	83	8.81	96.6
25	Ramon Martinez R. Martinez	3.45	246	118	71	.624	245	1,217	35	18	0	1618.0	1,426	620	715	139	649	50	1	36	6,847	30	6.77	3.61	1.88	0.77	17.8	9.5	1.28	.269	3.98	92	3.90	99	7.93	3.1