Jeremy Guthrie lost the most games in 2009, with 17 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	Jeremy Guthrie J. Guthrie	17	2009	BAL	10	.630	33	.370	33	5.04	110	1	0	0	200.0	224	112	120	35	60	9	0	1	874	1	4.95	2.70	1.83	1.58	12.6	6.9	1.42	.286	5.40	111	5.30	116	10.08	-14.9
2	Zach Duke Z. Duke	16	2009	PIT	11	.593	32	.407	32	4.06	106	3	1	0	213.0	231	96	101	23	49	3	0	0	891	2	4.48	2.07	2.16	0.97	11.9	5.5	1.31	.293	4.27	98	4.23	101	9.76	-1.1
3	Doug Davis D. Davis	14	2009	ARI	9	.609	34	.391	34	4.12	146	0	0	0	203.1	203	93	101	25	103	4	0	1	889	12	6.46	4.56	1.42	1.11	16.4	11.6	1.50	.291	4.47	94	4.83	112	8.99	-11.3
4	Aaron Harang A. Harang	14	2009	CIN	6	.700	26	.300	26	4.21	142	2	1	0	162.1	186	76	82	24	43	4	0	6	703	6	7.87	2.38	3.30	1.33	20.2	6.1	1.41	.331	4.55	99	4.13	95	10.31	4.2
5	Bronson Arroyo B. Arroyo	13	2009	CIN	15	.464	33	.536	33	3.84	127	3	2	0	220.1	214	94	101	31	65	9	0	6	923	1	5.19	2.66	1.95	1.27	13.8	7.0	1.27	.265	4.13	90	4.77	110	8.74	-9.6
6	Trevor Cahill T. Cahill	13	2009	OAK	10	.565	32	.435	32	4.63	90	0	0	0	178.2	185	92	99	27	72	4	0	1	773	5	4.53	3.63	1.25	1.36	11.6	9.3	1.44	.272	4.99	107	5.32	123	9.32	-20.4
7	Jose Contreras J. Contreras	13	2009	TOT	6	.684	28	.316	23	4.92	106	0	0	0	131.2	141	72	86	13	53	6	0	4	589	8	7.25	3.62	2.00	0.89	18.0	9.0	1.47	.311	5.88	107	4.10	90	9.64	6.7
8	Jon Garland J. Garland	13	2009	TOT	11	.542	33	.458	33	4.01	109	1	0	0	204.0	225	91	106	23	61	6	0	7	882	6	4.81	2.69	1.79	1.01	12.4	6.9	1.40	.296	4.68	92	4.47	104	9.93	-4
9	Luke Hochevar L. Hochevar	13	2009	KCR	7	.650	25	.350	25	6.55	106	2	1	0	143.0	167	104	109	23	46	8	0	0	631	9	6.67	2.90	2.30	1.45	16.8	7.3	1.49	.321	6.86	146	4.83	111	10.51	-7.5
10	Derek Holland D. Holland	13	2009	TEX	8	.619	33	.381	21	6.12	107	1	1	0	138.1	160	94	98	26	47	4	0	0	611	3	6.96	3.06	2.28	1.69	17.5	7.7	1.50	.314	6.38	131	5.09	112	10.41	-8
11	John Lannan J. Lannan	13	2009	WSH	9	.591	33	.409	33	3.88	89	2	1	0	206.1	210	89	100	22	68	6	0	5	875	3	3.88	2.97	1.31	0.96	10.2	7.8	1.35	.272	4.36	93	4.69	110	9.16	-9.4
12	Cliff Lee C. Lee	13	2009	TOT	14	.481	34	.519	34	3.22	181	6	2	0	231.2	245	83	88	17	43	5	0	1	969	7	7.03	1.67	4.21	0.66	18.7	4.4	1.24	.315	3.42	74	3.10	72	9.52	31.7
13	Francisco Liriano F. Liriano	13	2009	MIN	5	.722	29	.278	24	5.80	122	0	0	0	136.2	147	88	93	21	65	6	2	0	609	5	8.03	4.28	1.88	1.38	20.0	10.7	1.55	.319	6.12	133	4.86	114	9.68	-9.3
14	Jason Marquis J. Marquis	13	2009	COL	15	.464	33	.536	33	4.04	115	2	1	0	216.0	218	97	104	15	80	4	0	6	921	6	4.79	3.33	1.44	0.63	12.5	8.7	1.38	.287	4.33	88	4.09	92	9.08	8.4
15	Chris Volstad C. Volstad	13	2009	FLA	9	.591	29	.409	29	5.21	107	1	1	0	159.0	169	92	100	29	59	3	0	3	682	8	6.06	3.34	1.81	1.64	15.7	8.7	1.43	.289	5.66	123	5.28	127	9.57	-20.7
16	Barry Zito B. Zito	13	2009	SFG	10	.565	33	.435	33	4.03	154	1	0	0	192.0	179	86	89	21	81	8	0	8	818	2	7.22	3.80	1.90	0.98	18.8	9.9	1.35	.285	4.17	98	4.30	105	8.39	-4.5
17	Brian Bannister B. Bannister	12	2009	KCR	7	.632	26	.368	26	4.73	98	0	0	0	154.0	161	81	94	15	50	4	0	4	668	12	5.73	2.92	1.96	0.88	14.7	7.5	1.37	.291	5.49	105	4.13	95	9.41	3.9
18	Jason Berken J. Berken	12	2009	BAL	6	.667	24	.333	24	6.54	66	0	0	0	119.2	164	87	92	19	44	6	0	2	560	0	4.96	3.31	1.50	1.43	11.8	7.9	1.74	.341	6.92	144	5.30	116	12.33	-9
19	Yovani Gallardo Y. Gallardo	12	2009	MIL	13	.480	30	.520	30	3.73	204	1	0	0	185.2	150	77	78	21	94	5	0	5	793	9	9.89	4.56	2.17	1.02	25.7	11.9	1.31	.275	3.78	90	3.96	93	7.27	6.4
20	Matt Garza M. Garza	12	2009	TBR	8	.600	32	.400	32	3.95	189	0	0	0	203.0	177	89	93	25	79	11	0	0	861	3	8.38	3.50	2.39	1.11	22.0	9.2	1.26	.273	4.12	93	4.16	96	7.85	3.6
21	Livan Hernandez L. Hernandez	12	2009	TOT	9	.571	31	.429	31	5.44	102	2	0	0	183.2	220	111	112	19	67	1	0	5	806	1	5.00	3.28	1.52	0.93	12.7	8.3	1.56	.326	5.49	133	4.43	106	10.78	-5.5
22	Roberto Hernandez R. Hernandez	12	2009	CLE	5	.706	24	.294	24	6.32	79	0	0	0	125.1	151	88	97	16	70	8	0	0	596	5	5.67	5.03	1.13	1.15	13.3	11.7	1.76	.319	6.97	143	5.35	123	10.84	-14
23	Ubaldo Jimenez U. Jimenez	12	2009	COL	15	.444	33	.556	33	3.47	198	1	0	0	218.0	183	84	87	13	85	10	0	6	914	8	8.17	3.51	2.33	0.54	21.7	9.3	1.23	.280	3.59	75	3.35	76	7.56	25.5
24	Kenshin Kawakami K. Kawakami	12	2009	ATL	7	.632	32	.368	25	3.86	105	0	0	1	156.1	153	67	73	15	57	6	3	6	669	8	6.04	3.28	1.84	0.86	15.7	8.5	1.34	.284	4.20	93	4.20	99	8.81	0.5
25	Brian Moehler B. Moehler	12	2009	HOU	8	.600	29	.400	29	5.47	91	1	0	0	154.2	187	94	101	21	51	4	0	12	694	4	5.30	2.97	1.78	1.22	13.1	7.3	1.54	.315	5.88	133	4.74	111	10.88	-8