Edwin Jackson lost the most games in 2013, with 18 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	Edwin Jackson E. Jackson	18	2013	CHC	8	.692	31	.308	31	4.98	135	0	0	0	175.1	197	97	110	16	59	5	0	7	777	14	6.93	3.03	2.29	0.82	17.4	7.6	1.46	.322	5.65	133	3.78	100	10.11	0.3
2	Lucas Harrell L. Harrell	17	2013	HOU	6	.739	36	.261	22	5.86	89	0	0	0	153.2	174	100	111	20	88	6	8	5	707	8	5.21	5.15	1.01	1.17	12.6	12.4	1.70	.306	6.50	147	5.41	135	10.19	-23.8
3	Joe Saunders J. Saunders	16	2013	SEA	11	.593	32	.407	32	5.26	107	2	0	0	183.0	232	107	117	25	61	4	0	5	820	5	5.26	3.00	1.75	1.23	13.0	7.4	1.60	.332	5.75	137	4.72	121	11.41	-17.4
4	Wily Peralta W. Peralta	15	2013	MIL	11	.577	32	.423	32	4.37	129	2	1	0	183.1	187	89	107	19	73	7	0	3	802	12	6.33	3.58	1.77	0.93	16.1	9.1	1.42	.293	5.25	112	4.29	110	9.18	-7.2
5	Joe Blanton J. Blanton	14	2013	LAA	2	.875	28	.125	20	6.04	108	0	0	0	132.2	180	89	96	29	34	4	7	4	611	9	7.33	2.31	3.18	1.97	17.7	5.6	1.61	.346	6.51	159	5.12	133	12.21	-19.5
6	John Danks J. Danks	14	2013	CWS	4	.778	22	.222	22	4.75	89	0	0	0	138.1	151	73	81	28	27	4	0	0	583	3	5.79	1.76	3.30	1.82	15.3	4.6	1.29	.283	5.27	117	5.06	124	9.82	-14.5
7	Cole Hamels C. Hamels	14	2013	PHI	8	.636	33	.364	33	3.60	202	1	0	0	220.0	205	88	94	21	50	9	0	5	905	4	8.26	2.05	4.04	0.86	22.3	5.5	1.16	.295	3.85	96	3.25	85	8.39	14.1
8	Dan Haren D. Haren	14	2013	WSH	10	.583	31	.417	30	4.67	151	0	0	1	169.2	179	88	92	28	31	7	1	0	717	8	8.01	1.64	4.87	1.49	21.1	4.3	1.24	.302	4.88	125	4.08	110	9.50	-6.9
9	Phil Hughes P. Hughes	14	2013	NYY	4	.778	30	.222	29	5.19	121	0	0	0	145.2	170	84	91	24	42	5	0	4	642	6	7.48	2.59	2.88	1.48	18.8	6.5	1.46	.324	5.62	129	4.49	110	10.50	-6.3
10	Tim Lincecum T. Lincecum	14	2013	SFG	10	.583	32	.417	32	4.37	193	1	1	0	197.2	184	96	102	21	76	7	0	8	841	11	8.79	3.46	2.54	0.96	22.9	9.0	1.32	.300	4.64	127	3.73	106	8.38	-5
11	Chris Sale C. Sale	14	2013	CWS	11	.560	30	.440	30	3.07	226	4	1	0	214.1	184	73	81	23	46	14	0	2	866	8	9.49	1.93	4.91	0.97	26.1	5.3	1.07	.289	3.40	75	3.17	78	7.73	21.3
12	Kevin Correia K. Correia	13	2013	MIN	9	.591	31	.409	31	4.18	101	0	0	0	185.1	218	86	89	24	45	2	0	1	792	2	4.90	2.19	2.24	1.17	12.8	5.7	1.42	.313	4.32	104	4.40	111	10.59	-9
13	Scott Diamond S. Diamond	13	2013	MIN	6	.684	24	.316	24	5.43	52	0	0	0	131.0	163	79	88	21	36	1	0	4	576	5	3.57	2.47	1.44	1.44	9.0	6.3	1.52	.305	6.05	135	5.18	131	11.20	-17.8
14	R.A. Dickey	13	2013	TOR	14	.481	34	.519	34	4.21	177	3	1	0	224.2	207	105	113	35	71	10	0	0	943	7	7.09	2.84	2.49	1.40	18.8	7.5	1.24	.265	4.53	103	4.57	114	8.29	-14.1
15	Roberto Hernandez R. Hernandez	13	2013	TBR	6	.684	32	.316	24	4.89	113	1	0	1	151.0	164	82	87	24	38	13	3	8	643	3	6.74	2.26	2.97	1.43	17.6	5.9	1.34	.308	5.19	128	4.63	119	9.77	-12.8
16	Kyle Kendrick K. Kendrick	13	2013	PHI	10	.565	30	.435	30	4.70	110	2	1	0	182.0	207	95	104	18	47	7	0	4	800	3	5.44	2.32	2.34	0.89	13.8	5.9	1.40	.306	5.14	126	4.01	105	10.24	-3.3
17	Hiroki Kuroda H. Kuroda	13	2013	NYY	11	.542	32	.458	32	3.31	150	1	1	0	201.1	191	74	79	20	43	5	0	2	824	6	6.71	1.92	3.49	0.89	18.2	5.2	1.16	.282	3.53	82	3.56	87	8.54	11.5
18	John Lackey J. Lackey	13	2013	BOS	10	.565	29	.435	29	3.52	161	2	0	0	189.1	179	74	80	26	40	6	0	0	778	4	7.65	1.90	4.03	1.24	20.7	5.1	1.16	.281	3.80	84	3.86	99	8.51	0.4
19	Mike Pelfrey M. Pelfrey	13	2013	MIN	5	.722	29	.278	29	5.19	101	0	0	0	152.2	184	88	92	13	53	6	0	0	680	1	5.95	3.12	1.91	0.77	14.9	7.8	1.55	.337	5.42	129	3.99	101	10.85	-0.4
20	CC Sabathia	13	2013	NYY	14	.481	32	.519	32	4.78	175	2	0	0	211.0	224	112	122	28	65	4	0	5	908	7	7.46	2.77	2.69	1.19	19.3	7.2	1.37	.308	5.20	119	4.09	100	9.55	0
21	Jeff Samardzija J. Samardzija	13	2013	CHC	8	.619	33	.381	33	4.34	214	2	1	0	213.2	210	103	109	25	78	8	0	3	914	11	9.01	3.29	2.74	1.05	23.4	8.5	1.35	.314	4.59	116	3.77	99	8.85	0.8
22	Eric Stults E. Stults	13	2013	SDP	11	.542	33	.458	33	3.93	131	2	0	0	203.2	219	89	97	18	40	2	0	2	857	2	5.79	1.77	3.28	0.80	15.3	4.7	1.27	.302	4.29	111	3.52	96	9.68	3.6
23	Bronson Arroyo B. Arroyo	12	2013	CIN	14	.462	32	.538	32	3.79	124	2	1	0	202.0	199	85	88	32	34	7	0	2	823	1	5.52	1.51	3.65	1.43	15.1	4.1	1.15	.267	3.92	99	4.48	116	8.87	-13.1
24	Homer Bailey H. Bailey	12	2013	CIN	11	.522	32	.478	32	3.49	199	2	1	0	209.0	181	81	85	20	54	10	0	2	849	5	8.57	2.33	3.69	0.86	23.4	6.4	1.12	.284	3.66	92	3.30	85	7.79	13.1
25	Erik Bedard E. Bedard	12	2013	HOU	4	.750	32	.250	26	4.59	138	0	0	1	151.0	149	77	83	18	75	6	3	0	663	1	8.23	4.47	1.84	1.07	20.8	11.3	1.48	.308	4.95	115	4.37	109	8.88	-6.2