Between the 1999 and 2009 seasons, Andrew Bailey had the best ERA, with an ERA of 1.84.

Interpreted as:

best era with a minimum of 0.5 IP per team game by a player between 1999 to 2009

	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	Andrew Bailey A. Bailey	1.84	68	6	3	.667	0	91	0	0	26	83.1	49	17	17	5	24	0	54	3	323	6	9.83	2.59	3.79	0.54	28.2	7.4	0.88	.217	1.84	43	2.55	59	5.29	16.7
2	Tommy Hanson T. Hanson	2.89	21	11	4	.733	21	116	0	0	0	127.2	105	41	42	10	46	5	0	1	522	2	8.18	3.24	2.52	0.70	22.2	8.8	1.18	.275	2.96	70	3.49	82	7.40	10.5
3	Pedro Martinez P. Martinez	2.89	258	135	54	.714	256	1,933	23	7	0	1681.1	1,331	540	586	141	387	95	1	11	6,752	30	10.35	2.07	4.99	0.75	28.6	5.7	1.02	.284	3.14	64	2.71	62	7.12	321
4	Tim Lincecum T. Lincecum	2.90	90	40	17	.702	89	676	6	3	0	598.2	472	193	211	33	217	14	0	8	2,451	38	10.16	3.26	3.12	0.50	27.6	8.9	1.15	.291	3.17	68	2.75	65	7.10	99.7
5	Randy Wells R. Wells	2.95	31	12	10	.545	27	105	0	0	0	170.2	165	56	67	14	49	6	2	4	712	3	5.54	2.58	2.14	0.74	14.7	6.9	1.25	.281	3.53	68	3.89	91	8.70	7.3
6	Johan Santana J. Santana	3.12	310	122	60	.670	234	1,733	9	6	1	1709.2	1,430	592	641	187	473	34	23	10	6,946	65	9.12	2.49	3.66	0.98	24.9	6.8	1.11	.275	3.37	70	3.37	78	7.53	181.5
7	Adam Wainwright A. Wainwright	3.17	149	46	24	.657	86	511	3	0	3	644.0	616	227	248	49	193	19	11	8	2,714	19	7.14	2.70	2.65	0.68	18.8	7.1	1.26	.292	3.47	76	3.53	83	8.61	52.5
8	Jair Jurrjens J. Jurrjens	3.21	72	30	21	.588	72	304	0	0	0	434.0	398	155	174	30	156	8	0	10	1,819	8	6.30	3.24	1.95	0.62	16.7	8.6	1.28	.279	3.61	76	3.74	88	8.25	25.2
9	Roy Oswalt R. Oswalt	3.23	283	137	70	.662	271	1,473	18	6	0	1803.1	1,756	647	695	154	412	66	5	30	7,455	21	7.35	2.06	3.58	0.77	19.8	5.5	1.20	.299	3.47	75	3.34	76	8.76	208.1
10	Randy Johnson R. Johnson	3.23	322	160	87	.648	316	2,546	44	14	0	2157.0	1,823	774	876	242	554	98	3	25	8,765	38	10.62	2.31	4.60	1.01	29.0	6.3	1.10	.297	3.66	72	3.07	69	7.61	332.5
11	Kevin Brown K. Brown	3.23	172	72	45	.615	164	917	11	2	0	1078.0	976	387	441	87	277	38	0	8	4,435	30	7.66	2.31	3.31	0.73	20.7	6.2	1.16	.285	3.68	77	3.29	74	8.15	140.5
12	Jake Peavy J. Peavy	3.26	215	95	68	.583	215	1,366	7	3	0	1362.2	1,169	494	525	136	441	45	0	31	5,626	26	9.02	2.91	3.10	0.90	24.3	7.8	1.18	.284	3.47	82	3.45	82	7.72	115.8
13	Brandon Webb B. Webb	3.27	199	87	62	.584	198	1,065	15	8	0	1319.2	1,200	479	557	92	435	50	1	34	5,515	56	7.26	2.97	2.45	0.63	19.3	7.9	1.24	.286	3.80	72	3.49	78	8.18	146.6
14	John Smoltz J. Smoltz	3.27	396	67	50	.573	154	1,142	7	3	154	1245.0	1,150	452	475	107	276	23	204	31	5,070	28	8.26	2.00	4.14	0.77	22.5	5.4	1.15	.296	3.43	75	3.10	71	8.31	177.4
15	Clayton Kershaw C. Kershaw	3.36	53	13	13	.500	51	285	0	0	0	278.2	228	104	106	18	143	2	1	7	1,171	18	9.20	4.62	1.99	0.58	24.3	12.2	1.33	.290	3.42	81	3.46	82	7.36	23.1
16	Rich Harden R. Harden	3.39	135	50	29	.633	127	783	2	1	0	753.2	603	284	311	70	329	16	2	15	3,136	26	9.35	3.93	2.38	0.84	25.0	10.5	1.24	.275	3.71	77	3.57	81	7.20	68.5
17	Josh Johnson J. Johnson	3.40	86	34	16	.680	76	425	3	0	0	481.1	448	182	198	36	175	12	1	16	2,016	18	7.95	3.27	2.43	0.67	21.1	8.7	1.29	.301	3.70	79	3.49	81	8.38	42.5
18	Brad Bergesen B. Bergesen	3.43	19	7	5	.583	19	65	1	0	0	123.1	126	47	52	11	32	5	0	4	519	2	4.74	2.34	2.03	0.80	12.5	6.2	1.28	.283	3.79	76	4.09	89	9.19	6.7
19	Roy Halladay R. Halladay	3.44	311	147	76	.659	285	1,482	48	15	1	2032.2	1,988	777	866	170	453	56	6	22	8,380	43	6.56	2.01	3.27	0.75	17.7	5.4	1.20	.292	3.83	74	3.46	76	8.80	233.7
20	Felix Hernandez F. Hernandez	3.45	138	58	41	.586	138	810	7	3	0	905.0	863	347	385	80	287	27	0	13	3,786	46	8.06	2.85	2.82	0.80	21.4	7.6	1.27	.303	3.83	80	3.53	82	8.58	80.6
21	Roger Clemens R. Clemens	3.48	259	121	60	.669	258	1,519	4	2	0	1642.0	1,453	635	697	149	568	54	0	19	6,851	61	8.33	3.11	2.67	0.82	22.2	8.3	1.23	.286	3.82	77	3.53	78	7.96	178.2
22	Tim Hudson T. Hudson	3.49	311	148	78	.655	310	1,402	22	11	0	2059.2	1,958	798	874	164	632	75	0	61	8,604	58	6.13	2.76	2.22	0.72	16.3	7.3	1.26	.283	3.82	78	3.78	85	8.56	156.7
23	Mark Prior M. Prior	3.51	106	42	29	.592	106	757	5	1	0	657.0	582	256	277	77	223	31	0	10	2,771	21	10.37	3.05	3.39	1.05	27.3	8.0	1.23	.300	3.79	81	3.40	78	7.97	70.6
24	Carlos Zambrano C. Zambrano	3.51	259	105	68	.607	238	1,324	9	4	0	1551.1	1,313	605	669	126	698	81	4	36	6,593	49	7.68	4.05	1.90	0.73	20.1	10.6	1.30	.272	3.88	80	3.94	89	7.62	82.3
25	Bobby Ayala B. Ayala	3.51	66	1	7	.125	0	79	0	0	0	82.0	71	32	43	10	39	6	21	2	365	5	8.67	4.28	2.03	1.10	21.6	10.7	1.34	.264	4.72	77	4.43	96	7.79	1.8