Darrell May lost the most games in 2004, with 19 games.

	NAME	L	SEASON	TM	W	L%	G	W%	GS	ERA	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	Darrell May D. May	19	2004	KCR	9	.679	31	.321	31	5.61	120	3	1	0	186.0	234	116	130	38	55	2	0	4	832	2	5.81	2.66	2.18	1.84	14.4	6.6	1.55	.318	6.29	115	5.33	116	11.32	-14.3
2	Ryan Franklin R. Franklin	16	2004	SEA	4	.800	32	.200	32	4.90	104	2	1	0	200.1	224	109	116	33	61	10	0	1	870	0	4.67	2.74	1.70	1.48	12.0	7.0	1.42	.289	5.21	110	5.21	118	10.06	-17.8
3	Brandon Webb B. Webb	16	2004	ARI	7	.696	35	.304	35	3.59	164	1	0	0	208.0	194	83	111	17	119	11	0	11	933	17	7.10	5.15	1.38	0.74	17.6	12.8	1.50	.285	4.80	79	4.40	97	8.39	3.2
4	Casey Fossum C. Fossum	15	2004	ARI	4	.789	27	.211	27	6.65	117	0	0	0	142.0	171	105	111	31	63	10	0	5	652	4	7.42	3.99	1.86	1.96	17.9	9.7	1.65	.325	7.04	146	5.77	127	10.84	-18.8
5	Mark Hendrickson M. Hendrickson	15	2004	TBD	10	.600	32	.400	30	4.81	87	2	0	0	183.1	211	98	113	21	46	7	1	5	803	5	4.27	2.26	1.89	1.03	10.8	5.7	1.40	.296	5.55	105	4.45	98	10.36	1.5
6	Livan Hernandez L. Hernandez	15	2004	MON	11	.577	35	.423	35	3.60	186	9	2	0	255.0	234	102	105	26	83	10	0	9	1,053	1	6.56	2.93	2.24	0.92	17.7	7.9	1.24	.278	3.71	81	4.00	89	8.26	13.8
7	Jason Johnson J. Johnson	15	2004	DET	8	.652	33	.348	33	5.13	125	2	1	0	196.2	222	112	121	22	60	5	0	3	859	7	5.72	2.75	2.08	1.01	14.6	7.0	1.43	.309	5.54	114	4.21	94	10.16	5.6
8	Sidney Ponson S. Ponson	15	2004	BAL	11	.577	33	.423	33	5.30	115	5	2	0	215.2	265	127	136	23	69	8	0	3	954	8	4.80	2.88	1.67	0.96	12.1	7.2	1.55	.327	5.68	117	4.43	95	11.06	5.5
9	Adam Eaton A. Eaton	14	2004	SDP	11	.560	33	.440	33	4.61	153	0	0	0	199.1	204	102	113	28	52	10	0	3	848	5	6.91	2.35	2.94	1.26	18.0	6.1	1.28	.291	5.10	116	4.26	101	9.21	-1.3
10	Tom Glavine T. Glavine	14	2004	NYM	11	.560	33	.440	33	3.60	109	1	1	0	212.1	204	85	94	20	70	0	0	10	904	0	4.62	2.97	1.56	0.85	12.1	7.7	1.29	.261	3.98	86	4.23	98	8.65	1.9
11	Randy Johnson R. Johnson	14	2004	ARI	16	.467	35	.533	35	2.60	290	4	2	0	245.2	177	71	88	18	44	10	0	1	964	3	10.62	1.61	6.59	0.66	30.1	4.6	0.90	.264	3.22	57	2.29	51	6.48	59.7
12	Brian Lawrence B. Lawrence	14	2004	SDP	15	.483	34	.517	34	4.12	121	2	1	0	203.0	226	93	101	26	55	7	0	7	870	2	5.36	2.44	2.20	1.15	13.9	6.3	1.38	.303	4.48	104	4.43	105	10.02	-5.2
13	Ben Sheets B. Sheets	14	2004	MIL	12	.538	34	.462	34	2.70	264	5	0	0	237.0	201	71	85	25	32	4	0	1	937	8	10.03	1.22	8.25	0.95	28.2	3.4	0.98	.288	3.23	63	2.64	59	7.63	47.2
14	Miguel Batista M. Batista	13	2004	TOR	10	.565	38	.435	31	4.80	104	2	1	5	198.2	206	106	115	22	96	3	7	1	867	12	4.71	4.35	1.08	1.00	12.0	11.1	1.52	.287	5.21	101	4.93	107	9.33	-6.7
15	Jeremy Bonderman J. Bonderman	13	2004	DET	11	.542	33	.458	32	4.89	168	2	2	0	184.0	168	100	101	24	73	10	0	5	793	7	8.22	3.57	2.30	1.17	21.2	9.2	1.31	.278	4.94	109	4.26	95	8.22	4.3
16	Matt Clement M. Clement	13	2004	CHC	9	.591	30	.409	30	3.68	190	0	0	0	181.0	155	74	79	23	77	12	0	4	775	14	9.45	3.83	2.47	1.14	24.5	9.9	1.28	.279	3.93	85	4.07	91	7.71	8.4
17	John Lackey J. Lackey	13	2004	ANA	14	.481	33	.519	32	4.67	144	1	1	0	198.1	215	103	108	22	60	8	0	4	855	11	6.53	2.72	2.40	1.00	16.8	7.0	1.39	.311	4.90	104	4.06	92	9.76	8.1
18	Kyle Lohse K. Lohse	13	2004	MIN	9	.591	35	.409	34	5.34	111	1	1	0	194.0	240	115	128	28	76	7	1	5	883	6	5.15	3.53	1.46	1.30	12.6	8.6	1.63	.321	5.94	115	5.06	115	11.13	-15.2
19	Mike Maroth M. Maroth	13	2004	DET	11	.542	33	.458	33	4.31	108	2	1	0	217.0	244	104	112	25	59	7	0	1	928	10	4.48	2.45	1.83	1.04	11.6	6.4	1.40	.300	4.65	96	4.45	100	10.12	0.4
20	Jamie Moyer J. Moyer	13	2004	SEA	7	.650	34	.350	33	5.21	125	1	0	0	202.0	217	117	127	44	63	11	1	3	888	1	5.57	2.81	1.98	1.96	14.1	7.1	1.39	.268	5.66	117	5.73	129	9.67	-30.1
21	Steve Trachsel S. Trachsel	13	2004	NYM	12	.520	33	.480	33	4.00	117	0	0	0	202.2	203	90	104	25	83	5	0	9	881	4	5.20	3.69	1.41	1.11	13.3	9.4	1.41	.273	4.62	96	4.79	111	9.01	-11.2
22	Ryan Vogelsong R. Vogelsong	13	2004	PIT	6	.684	31	.316	26	6.50	92	0	0	0	133.0	148	96	97	22	67	10	4	7	610	3	6.23	4.53	1.37	1.49	15.1	11.0	1.62	.301	6.56	151	5.54	127	10.02	-17.8
23	Jeff Weaver J. Weaver	13	2004	LAD	13	.500	34	.500	34	4.01	153	0	0	0	220.0	219	98	103	19	67	14	0	9	935	9	6.26	2.74	2.28	0.78	16.4	7.2	1.30	.293	4.21	97	3.88	88	8.96	12.8
24	Jose Acevedo J. Acevedo	12	2004	CIN	5	.706	39	.294	27	5.94	117	0	0	0	157.2	188	104	108	30	45	5	3	8	704	3	6.68	2.57	2.60	1.71	16.6	6.4	1.48	.312	6.16	137	4.98	110	10.73	-7.4
25	Brian Anderson B. Anderson	12	2004	KCR	6	.667	35	.333	26	5.64	70	2	1	0	166.0	217	104	123	33	53	1	2	4	745	2	3.80	2.87	1.32	1.79	9.4	7.1	1.63	.313	6.67	116	5.76	125	11.77	-20.6