Mordecai Brown has the lowest career ERA for the Cubs, with an ERA of 1.80.

Interpreted as:

cubs best with a minimum of 750 IP pitchers all-time

	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	Mordecai Brown M. Brown	1.80	2329.0	346	188	86	.686	241	1,043	206	48	39	1,879	465	679	19	445	44	98		8,967	41	4.03	1.72	2.34	0.07	11.6	5.0	1.00	.251	2.62	64	2.21	78	7.26	159.6
2	Jack Pfiester J. Pfiester	1.85	1028.1	143	70	40	.636	123	482	72	17	0	815	211	326	6	274	37	12		4,046	15	4.22	2.40	1.76	0.05	11.9	6.8	1.06	.249	2.85	72	2.29	85	7.13	44.5
3	Orval Overall O. Overall	1.94	1135.0	163	86	43	.667	133	729	95	28	12	865	245	322	11	358	27	24		4,478	37	5.78	2.84	2.04	0.09	16.3	8.0	1.08	.255	2.55	74	2.10	78	6.86	74.3
4	Jake Weimer J. Weimer	2.14	839.1	105	58	34	.630	100	412	84	10	1	682	200	291	6	281	30	5		3,427	14	4.42	3.01	1.47	0.06	12.0	8.2	1.15	.251	3.12	73	2.78	94	7.31	12.9
5	Ed Reulbach E. Reulbach	2.24	1864.2	281	136	65	.677	216	799	149	31	9	1,459	464	606	21	650	85	54		7,405	29	3.86	3.14	1.23	0.10	10.8	8.8	1.13	.246	2.92	79	2.87	99	7.04	0
6	Larry Corcoran L. Corcoran	2.26	2338.1	270	175	85	.673	262	1,086	252	22	2	2,084	588	1,181	65	462		8		9,740	111	4.18	1.78	2.35	0.25	11.1	4.7	1.09		4.55	77	2.94	96	8.02	51.8
7	Hippo Vaughn H. Vaughn	2.33	2216.1	305	151	105	.590	270	1,138	177	35	4	1,971	575	789	35	621	63	31		9,097	41	4.62	2.52	1.83	0.14	12.5	6.8	1.17	.267	3.20	79	2.56	86	8.00	96.3
8	Terry Larkin T. Larkin	2.34	1019.1	114	60	49	.550	114	305	113	5	0	1,025	265	565	9	61		0		4,281	57	2.69	0.54	5.00	0.08	7.1	1.4	1.07		4.99	95	2.33	94	9.05	24.6
9	John Clarkson J. Clarkson	2.39	1730.2	199	137	57	.706	197	960	186	15	0	1,523	460	850	69	300	8	2		7,062	63	4.99	1.56	3.20	0.36	13.6	4.2	1.05	.254	4.42	67	3.03	82	7.92	155.6
10	Carl Lundgren C. Lundgren	2.42	1322.0	179	91	55	.623	149	535	125	19	6	1,129	355	496	16	476	35	28		5,320	26	3.64	3.24	1.12	0.11	10.1	8.9	1.21	.261	3.38	90	2.94	106	7.69	-23.7
11	Jack Taylor J. Taylor	2.65	1810.0	216	109	90	.548	197	430	189	14	3	1,772	532	857	23	370	63	19		7,355	26	2.14	1.84	1.16	0.11	5.8	5.0	1.18	.270	4.26	83	3.15	98	8.81	8.7
12	Larry Cheney L. Cheney	2.74	1061.0	174	76	51	.598	132	512	80	14	16	900	323	444	22	407	29	37		4,418	71	4.34	3.45	1.26	0.19	11.6	9.2	1.23	.255	3.77	90	3.13	100	7.63	1.2
13	Fred Goldsmith F. Goldsmith	2.78	1516.2	177	107	63	.629	174	391	164	16	1	1,595	468	834	38	168		2		6,382	54	2.32	1.00	2.33	0.23	6.1	2.6	1.16		4.95	92	3.04	100	9.46	13.1
14	Lon Warneke L. Warneke	2.84	1624.2	262	109	72	.602	190	706	122	17	12	1,549	512	613	71	413	17	48		6,708	33	3.91	2.29	1.71	0.39	10.5	6.2	1.21	.269	3.40	75	3.46	90	8.58	68.5
15	Grover Alexander G. Alexander	2.84	1884.1	242	128	83	.607	224	614	158	24	10	1,919	595	717	70	268	10	15		7,647	13	2.93	1.28	2.29	0.33	8.0	3.5	1.16	.277	3.42	75	3.17	84	9.17	120.9
16	Claude Hendrix C. Hendrix	2.84	1076.0	168	57	61	.483	120	425	76	9	3	1,048	340	442	18	289	27	34		4,485	32	3.55	2.42	1.47	0.15	9.5	6.4	1.24	.276	3.70	99	2.71	94	8.77	21.8
17	Claude Passeau C. Passeau	2.96	1914.2	292	124	94	.569	234	754	143	22	15	1,919	629	751	73	474	21	44		8,063	17	3.54	2.23	1.59	0.34	9.4	5.9	1.25	.274	3.53	83	3.09	86	9.02	111
18	Jimmy Lavender J. Lavender	3.03	1078.0	196	57	68	.456	128	495	58	10	11	978	363	486	33	403	53	41		4,522	25	4.13	3.36	1.23	0.28	10.9	8.9	1.28	.267	4.06	102	3.28	108	8.17	-29.3
19	Hank Wyse H. Wyse	3.03	1063.0	198	69	54	.561	133	321	63	11	8	1,105	358	432	50	268	15	38		4,452	9	2.72	2.27	1.20	0.42	7.2	6.0	1.29	.278	3.66	85	3.29	93	9.36	25.5
20	Jake Arrieta J. Arrieta	3.14	889.1	148	73	42	.635	148	867	6	5	0	699	310	349	82	283	32	0	11	3,608	47	8.77	2.86	3.06	0.83	24.0	7.8	1.10	.263	3.53	78	3.44	85	7.07	55.6
21	Bill Hands B. Hands	3.18	1564.0	276	92	86	.517	213	900	64	14	9	1,485	552	636	132	389	27	36	50	6,464	32	5.18	2.24	2.31	0.76	13.9	6.0	1.20	.270	3.66	84	3.24	89	8.55	71.7
22	Fergie Jenkins F. Jenkins	3.20	2673.2	401	167	132	.559	347	2,038	154	29	6	2,402	952	1,061	271	600	52	25	77	10,898	37	6.86	2.02	3.40	0.91	18.7	5.5	1.12	.268	3.57	84	3.06	83	8.09	182
23	Larry Jackson L. Jackson	3.26	838.0	119	52	52	.500	116	437	44	11	0	803	304	355	59	173	12	1	19	3,448	12	4.69	1.86	2.53	0.63	12.7	5.0	1.16	.269	3.81	90	3.07	88	8.62	39.7
24	Jimmy Callahan J. Callahan	3.29	1043.2	121	66	47	.584	119	279	116	8	0	1,162	381	598	18	276	64	2		4,484	28	2.41	2.38	1.01	0.16	6.2	6.2	1.38	.297	5.16	87	3.60	95	10.02	19
25	Milt Pappas M. Pappas	3.33	763.0	115	51	41	.554	112	307	31	11	0	793	282	316	77	167	17	2	27	3,177	13	3.62	1.97	1.84	0.91	9.7	5.3	1.26	.274	3.73	85	3.72	97	9.35	12