Ed Walsh and Joe McGinnity are tied for starting the most games in a month, with 12 starts.

Interpreted as:

most pitching games started by a player in a month

	NAME	GS	MONTH	G	W	L	W%	ERA	SO	CG	SHO	SV	IP	H	ER	R	HR	BB	HBP	GF	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	H/9
1	Ed Walsh E. Walsh	12	September 1908	13	9	4	.692		74	11	6	0	107.0	70		13	1	12	2	1	396	2	6.22	1.01	6.17	0.08	18.7	3.0	0.77	.225	1.09	5.89
2	Joe McGinnity J. McGinnity	12	August 1903	12	7	5	.583		58	11	0	0	105.0	89		36	1	22	2	0	420	1	4.97	1.89	2.64	0.09	13.8	5.2	1.06	.261	3.09	7.63
3	Joe McGinnity J. McGinnity	12	September 1901	12	5	7	.417	3.47	18	10	1	0	93.1	98	36	55	1	20	8	0		3	1.74	1.93	0.90	0.10		5.6	1.26	.313	5.30	9.45
4	Dave Davenport D. Davenport	11	September 1915	14	8	2	.800	1.51	40	9	4	0	101.1	63	17	18	2	19	0	2		1	3.55	1.69	2.11	0.18		6.4	0.81	.258	1.60	5.60
5	Dave Davenport D. Davenport	11	July 1915	12	3	6	.333	2.73	59	6	2	0	89.0	71	27	32	0	20	2	1		1	5.97	2.02	2.95	0.00		10.3	1.02	.623	3.24	7.18
6	Ed Walsh E. Walsh	11	July 1907	11	6	5	.545		45	11	2	0	101.0	78		24	1	20	2	0	397	2	4.01	1.78	2.25	0.09	11.3	5.0	0.97	.234	2.14	6.95
7	Dizzy Dean D. Dean	10	July 1932	12	2	4	.333	3.68	54	2	0	1	80.2	77	33	38	3	30	1	2	338	1	6.02	3.35	1.80	0.33	16.0	8.9	1.33	.296	4.24	8.59
8	Guy Morton G. Morton	10	July 1922	10	6	3	.667	2.55	35	7	3	0	70.2	59	20	27	0	23	0	0	292	1	4.46	2.93	1.52	0.00	12.0	7.9	1.16	.252	3.44	7.51
9	George Uhle G. Uhle	10	July 1922	10	4	4	.500	3.38	15	6	2	0	66.2	70	25	29	1	22	2	0	290	1	2.03	2.97	0.68	0.14	5.2	7.6	1.38	.276	3.91	9.45
10	Urban Shocker U. Shocker	10	August 1921	10	8	1	.889	3.14	37	9	0	0	83.0	90	29	35	2	22	2	0	359	1	4.01	2.39	1.68	0.22	10.3	6.1	1.35	.297	3.80	9.76
11	Lefty Williams L. Williams	10	July 1919	10	5	1	.833	3.71	20	5	1	0	60.2	65	25	28	2	13	4	0	255	0	2.97	1.93	1.54	0.30	7.8	5.1	1.29	.292	4.15	9.64
12	Mule Watson M. Watson	10	August 1918	11	3	6	.333	3.45	13	5	2	0	73.0	69	28	37	0	24	0	1	292	0	1.60	2.96	0.54	0.00	4.5	8.2	1.27	.271	4.56	8.51
13	Pol Perritt P. Perritt	10	August 1918	12	4	6	.400	3.89	17	6	2	0	71.2	71	31	34	4	11	0	2	289	0	2.13	1.38	1.55	0.50	5.9	3.8	1.14	.261	4.27	8.92
14	Dick Rudolph D. Rudolph	10	September 1916	10	3	4	.429	1.78	31	8	2	0	81.0	68	16	27	4	6	2	0	312	0	3.44	0.67	5.17	0.44	9.9	1.9	0.91	.238	3.00	7.56
15	Grover Alexander G. Alexander	10	September 1916	11	7	3	.700	2.08	35	8	2	1	86.1	91	20	29	1	11	2	1	352	0	3.65	1.15	3.18	0.10	9.9	3.1	1.18	.297	3.02	9.49
16	Doc Crandall D. Crandall	10	August 1915	13	5	2	.714	2.05	28	6	2	0	70.1	57		19	0	21	3	2		1	3.58	2.69	1.33	0.00		9.8	1.11	.350	2.43	7.29
17	Bill Bailey B. Bailey	10	September 1914	11	5	4	.556	3.08	79	5	0	0	76.0	64	26	35	0	46	3	0		6	9.36	5.45	1.72	0.00		25.8	1.45	1.280	4.14	7.58
18	Vean Gregg V. Gregg	10	August 1912	10	3	5	.375	0.73	39	5	0	0	61.1	64		30	3	27	0	0	260	1	5.72	3.96	1.44	0.44	15.0	10.4	1.48	.319	4.40	9.39
19	Jack Coombs J. Coombs	10	July 1910	11	10	1	.909		49	10	5	0	90.1	68		17	0	28	1	1	352	3	4.88	2.79	1.75	0.00	13.9	8.0	1.06	.248	1.69	6.77
20	Walter Johnson W. Johnson	10	July 1909	10	1	9	.100		48	7	0	0	71.1	69		38	0	15	2	0	298	3	6.06	1.89	3.20	0.00	16.1	5.0	1.18	.296	4.79	8.71
21	Frank Arellanes F. Arellanes	10	July 1909	11	6	2	.750		23	7	0	1	79.1	66		18	0	13	2	1	311	1	2.61	1.47	1.77	0.00	7.4	4.2	1.00	.242	2.04	7.49
22	Frank Smith F. Smith	10	September 1908	11	6	4	.600		43	7	1	0	86.0	59		24	0	19	1	1	333	5	4.50	1.99	2.26	0.00	12.9	5.7	0.91	.219	2.51	6.17
23	Ed Reulbach E. Reulbach	10	July 1908	11	8	2	.800		26	6	1	0	76.1	61		21	0	31	1	1	316	0	3.07	3.66	0.84	0.00	8.2	9.8	1.21	.236	2.48	7.19
24	Doc White D. White	10	September 1907	11	7	3	.700		30	7	2	1	74.0	57		23	0	6	1	1		0	3.65	0.73	5.00	0.00		2.5	0.85	.285	2.80	6.93
25	Jack Chesbro J. Chesbro	10	July 1905	10	6	3	.667		40	7	2	0	79.1	58		23	0	16	2	0		2	4.54	1.82	2.50	0.00		6.9	0.93	.331	2.61	6.58