Vern Kennedy lost the most games in 1939, with 20 games.

	NAME	L	SEASON	TM	W	L%	G	W%	GS	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	ERA-	FIP	FIP-	H/9	PRAA
1	Vern Kennedy V. Kennedy	20	1939	TOT	9	.690	37	.310	31	5.80	64	13	1	0	212.2	254	137	145	22	124	2	5	1,001	3	2.71	5.25	0.52	0.93	6.4	12.4	1.78	.294	6.14	120	5.49	118	10.75	-18.7
2	Ken Chase K. Chase	19	1939	WSH	10	.655	32	.345	31	3.80	118	15	1	0	232.0	215	98	116	10	114	1	1	1,019	11	4.58	4.42	1.04	0.39	11.6	11.2	1.42	.264	4.50	87	4.00	95	8.34	5.4
3	Max Butcher M. Butcher	17	1939	TOT	6	.739	34	.261	28	4.73	48	8	2	0	192.1	238	101	112	12	74	1	3	880	2	2.25	3.46	0.65	0.56	5.5	8.4	1.62	.303	5.24	121	4.45	109	11.14	-8
4	Bob Klinger B. Klinger	17	1939	PIT	14	.548	37	.452	33	4.36	64	10	2	0	225.0	251	109	120	11	81	3	3	989	6	2.56	3.24	0.79	0.44	6.5	8.2	1.48	.289	4.80	111	4.16	102	10.04	-2
5	Joe Krakauskas J. Krakauskas	17	1939	WSH	11	.607	39	.393	29	4.60	110	12	0	1	217.1	230	111	125	13	114	1	8	966	5	4.56	4.72	0.96	0.54	11.4	11.8	1.58	.298	5.18	105	4.33	102	9.52	-3.1
6	Curt Davis C. Davis	16	1939	SLN	22	.421	49	.579	31	3.63	70	13	3	7	248.0	279	100	121	18	48	3	14	1,059	2	2.54	1.74	1.46	0.65	6.6	4.5	1.32	.284	4.39	88	3.97	93	10.13	9.1
7	Jack Kramer J. Kramer	16	1939	SLA	9	.640	40	.360	31	5.83	68	10	2	0	211.2	269	137	150	18	127	3	5	998	9	2.89	5.40	0.54	0.77	6.8	12.7	1.87	.321	6.38	121	5.28	114	11.44	-14
8	Hugh Mulcahy H. Mulcahy	16	1939	PHN	9	.640	38	.360	32	4.99	59	14	1	3	225.2	246	125	144	19	93	11	6	1,006	11	2.35	3.71	0.63	0.76	5.9	9.2	1.50	.275	5.74	127	4.93	121	9.81	-21.3
9	Kirby Higbe K. Higbe	15	1939	TOT	12	.556	43	.444	28	4.67	95	14	1	2	210.0	220	109	122	10	123	10	13	965	7	4.07	5.27	0.77	0.43	9.8	12.7	1.63	.289	5.23	119	4.59	112	9.43	-11.9
10	Bill Lee B. Lee	15	1939	CHC	19	.441	37	.559	36	3.44	105	20	1	0	282.1	295	108	125	18	85	1	1	1,202	4	3.35	2.71	1.24	0.57	8.7	7.1	1.35	.279	3.98	88	3.97	97	9.40	3.4
11	Cliff Melton C. Melton	15	1939	NYG	12	.556	41	.444	23	3.56	95	9	2	5	207.1	214	82	94	7	65	4	13	886	2	4.12	2.82	1.46	0.30	10.7	7.3	1.35	.290	4.08	90	3.49	85	9.29	14.4
12	Boom-Boom Beck B. Beck	14	1939	PHN	7	.667	34	.333	16	4.62	77	12	0	4	181.1	200	93	101	11	64	3	13	805	1	3.82	3.18	1.20	0.55	9.6	8.0	1.46	.291	5.01	118	4.02	99	9.93	1.2
13	Joe Bowman J. Bowman	14	1939	PIT	10	.583	37	.417	27	4.48	58	10	1	1	184.2	217	92	105	15	43	7	8	813	1	2.83	2.10	1.35	0.73	7.1	5.3	1.41	.293	5.12	114	4.21	103	10.58	-2.7
14	Danny MacFayden D. MacFayden	14	1939	BSN	8	.636	33	.364	28	3.90	46	8	0	2	191.2	221	83	100	11	59	4	3	846	2	2.16	2.77	0.78	0.52	5.4	7.0	1.46	.289	4.70	107	4.22	111	10.38	-10.9
15	Buck Ross B. Ross	14	1939	PHA	6	.700	29	.300	28	6.00	43	6	1	0	174.0	216	116	143	17	95	0	0	833	5	2.22	4.91	0.45	0.88	5.2	11.4	1.79	.294	7.40	130	5.39	121	11.17	-18
16	Mace Brown M. Brown	13	1939	PIT	9	.591	47	.409	19	3.37	71	8	1	7	200.1	232	75	90	8	52	2	18	872	3	3.19	2.34	1.37	0.36	8.1	6.0	1.42	.303	4.04	86	3.59	88	10.42	10.8
17	George Gill G. Gill	13	1939	TOT	1	.929	30	.071	12	7.21	25	5	0	0	103.2	153	83	97	11	37	3	11	495	1	2.17	3.21	0.68	0.95	5.1	7.5	1.83	.339	8.42	150	5.03	108	13.28	-4
18	Luke Hamlin L. Hamlin	13	1939	BKN	20	.394	40	.606	36	3.64	88	19	2	0	269.2	255	109	115	27	54	0	2	1,100	2	2.94	1.80	1.63	0.90	8.0	4.9	1.15	.245	3.84	90	4.22	101	8.51	-0.1
19	Bob Harris B. Harris	13	1939	TOT	4	.765	33	.235	17	5.50	57	6	0	0	144.0	180	88	96	9	79	0	7	667	10	3.56	4.94	0.72	0.56	8.5	11.8	1.80	.328	6.00	114	4.64	100	11.25	0.6
20	Bill Lohrman B. Lohrman	13	1939	NYG	12	.520	38	.480	24	4.07	70	9	1	1	185.2	200	84	91	15	45	3	7	769	5	3.39	2.18	1.56	0.73	9.1	5.9	1.32	.291	4.41	103	4.04	98	9.69	1.7
21	Lynn Nelson L. Nelson	13	1939	PHA	10	.565	35	.435	24	4.78	75	12	2	1	197.2	233	105	117	27	64	3	11	877	0	3.41	2.91	1.17	1.23	8.6	7.3	1.50	.291	5.33	103	5.01	112	10.61	-12.1
22	Claude Passeau C. Passeau	13	1939	TOT	15	.464	42	.536	35	3.28	137	17	2	3	274.1	269	100	112	9	73	5	6	1,150	0	4.49	2.39	1.88	0.30	11.9	6.3	1.25	.281	3.67	84	3.25	80	8.83	25.2
23	Ike Pearson I. Pearson	13	1939	PHN	2	.867	26	.133	13	5.76	29	4	0	0	125.0	144	80	84	15	56	5	10	570	2	2.09	4.03	0.52	1.08	5.1	9.8	1.60	.277	6.05	147	5.53	136	10.37	-20.2
24	Bill Posedel B. Posedel	13	1939	BSN	15	.464	33	.536	29	3.92	73	18	5	0	220.2	221	96	103	8	78	0	3	927	1	2.98	3.18	0.94	0.33	7.9	8.4	1.35	.277	4.20	108	3.84	101	9.01	-2.5
25	Bill Trotter B. Trotter	13	1939	SLA	6	.684	41	.316	13	5.34	61	4	0	0	156.2	205	93	120	16	54	5	14	714	0	3.50	3.10	1.13	0.92	8.5	7.6	1.65	.327	6.89	111	4.65	100	11.78	0.1