Rollie Fingers has the best career ERA for the Oakland Athletics, with an ERA of 2.91.

Interpreted as:

best oakland a's with a minimum of 750 IP pitchers

	NAME	ERA	IP	G	W	L	W%	GS	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-	H/9	PRAA
1	Rollie Fingers R. Fingers	2.91	1016.0	502	67	61	.523	37	784	4	2	136	860	328	375	75	293	34	338	47	4,116	21	6.94	2.60	2.68	0.66	19.0	7.1	1.13	.268	3.32	86	2.92	82	7.62	71.3
2	Ken Holtzman K. Holtzman	2.92	1084.1	157	77	55	.583	153	530	54	13	0	997	352	414	75	277	18	0	15	4,451	27	4.40	2.30	1.91	0.62	11.9	6.2	1.17	.260	3.44	87	3.26	93	8.28	31.1
3	Vida Blue V. Blue	2.95	1945.2	273	124	86	.590	262	1,315	105	28	2	1,650	638	731	139	617	18	2	28	7,935	57	6.08	2.85	2.13	0.64	16.6	7.8	1.17	.258	3.38	85	3.12	86	7.63	106.6
4	Catfish Hunter C. Hunter	3.00	1887.0	266	131	77	.630	260	1,139	96	24	1	1,588	630	701	207	493	30	3	30	7,623	22	5.43	2.35	2.31	0.99	14.9	6.5	1.10	.240	3.34	91	3.55	103	7.57	-30.7
5	Tim Hudson T. Hudson	3.30	1240.2	183	92	39	.702	183	899	16	8	0	1,134	455	509	94	382	47	0	33	5,150	39	6.52	2.77	2.35	0.68	17.5	7.4	1.22	.279	3.69	73	3.62	80	8.23	127
6	Blue Moon Odom B. Moon Odom	3.38	1202.2	220	71	61	.538	178	675	34	11	1	1,054	452	518	80	598	30	11	31	5,138	68	5.05	4.48	1.13	0.60	13.1	11.6	1.37	.259	3.88	103	3.79	112	7.89	-58.7
7	Mike Moore M. Moore	3.54	874.0	137	66	46	.589	137	515	14	4	0	802	344	383	59	375	18	0	9	3,707	66	5.30	3.86	1.37	0.61	13.9	10.1	1.35	.271	3.94	95	3.84	101	8.26	-4.3
8	Barry Zito B. Zito	3.58	1437.1	225	102	63	.618	224	1,098	9	4	0	1,240	572	628	152	566	65	1	14	6,035	26	6.88	3.54	1.94	0.95	18.2	9.4	1.26	.262	3.93	81	4.20	94	7.76	40.5
9	Chuck Dobson C. Dobson	3.61	919.0	142	58	48	.547	140	557	42	10	0	862	369	412	93	325	11	2	25	3,861	35	5.45	3.18	1.71	0.91	14.4	8.4	1.29	.267	4.03	109	3.70	107	8.44	-28.6
10	Dave Stewart D. Stewart	3.73	1717.1	257	119	78	.604	245	1,152	49	9	0	1,608	712	784	152	655	42	2	11	7,305	79	6.04	3.43	1.76	0.80	15.8	9.0	1.32	.275	4.11	96	3.84	97	8.43	17.3
11	Mike Norris M. Norris	3.89	1124.1	201	58	59	.496	157	636	52	7	0	972	486	542	108	499	45	16	16	4,797	53	5.09	3.99	1.27	0.86	13.3	10.4	1.31	.246	4.34	104	4.26	109	7.78	-42.9
12	Mark Mulder M. Mulder	3.92	1003.0	150	81	42	.659	150	668	22	8	0	990	437	471	99	298	34	0	13	4,193	34	5.99	2.67	2.24	0.89	15.9	7.1	1.28	.288	4.23	87	3.98	88	8.88	58.1
13	Bob Welch B. Welch	3.94	1271.1	214	96	60	.615	195	677	14	5	0	1,263	556	608	134	469	42	4	18	5,431	18	4.79	3.32	1.44	0.95	12.5	8.6	1.36	.275	4.30	102	4.34	111	8.94	-64.2
14	Rick Langford R. Langford	3.97	1468.0	248	73	105	.410	195	654	85	10	0	1,543	648	728	158	402	18	19	29	6,224	38	4.01	2.46	1.63	0.97	10.5	6.5	1.32	.277	4.46	104	4.06	102	9.46	-14.7
15	Steve McCatty S. McCatty	3.99	1188.1	221	63	63	.500	161	541	45	7	5	1,172	527	581	124	520	31	32	20	5,176	25	4.10	3.94	1.04	0.94	10.5	10.0	1.42	.265	4.40	104	4.55	114	8.88	-77.5
16	Matt Keough M. Keough	4.13	1060.1	170	50	75	.400	155	510	53	7	0	1,063	487	553	111	456	22	5	9	4,596	55	4.33	3.87	1.12	0.94	11.1	9.9	1.43	.272	4.69	109	4.43	112	9.02	-57.1
17	Joe Blanton J. Blanton	4.25	760.2	122	47	46	.505	118	431	6	2	0	810	359	382	69	202	15	1	14	3,221	11	5.10	2.39	2.13	0.82	13.4	6.3	1.33	.296	4.52	98	4.03	92	9.58	29.4
18	Curt Young C. Young	4.33	1039.1	228	65	51	.560	155	516	15	3	0	1,053	500	546	145	349	31	13	9	4,436	26	4.47	3.02	1.48	1.26	11.6	7.9	1.35	.267	4.73	112	4.71	119	9.12	-88.9