Livan Hernandez won the most games for the Nationals in 2005, with 15 wins.

	NAME	W	SEASON	TM	L	W%	G	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	Livan Hernandez L. Hernandez	15	2005	WSH	10	.600	35	35	3.98	147	2	0	0	246.1	268	109	116	25	84	13	0	14	1,065	3	5.37	3.07	1.75	0.91	13.8	7.9	1.43	.305	4.24	98	4.32	105	9.79	-5.9
2	Esteban Loaiza E. Loaiza	12	2005	WSH	10	.545	34	34	3.77	173	0	0	0	217.0	227	91	93	18	55	5	0	3	912	6	7.18	2.28	3.15	0.75	19.0	6.0	1.30	.316	3.86	93	3.32	81	9.41	19.5
3	John Patterson J. Patterson	9	2005	WSH	7	.563	31	31	3.13	185	2	1	0	198.1	172	69	71	19	65	5	0	11	817	9	8.39	2.95	2.85	0.86	22.6	8.0	1.19	.282	3.22	77	3.45	84	7.81	15
4	Luis Ayala L. Ayala	8	2005	WSH	7	.533	68	0	2.66	40	0	0	1	71.0	75	21	23	7	14	6	18	4	293	0	5.07	1.77	2.86	0.89	13.7	4.8	1.25	.301	2.92	66	4.01	97	9.51	0.8
5	Tony Armas T. Armas	7	2005	WSH	7	.500	19	19	4.97	59	0	0	0	101.1	100	56	57	16	54	5	0	4	452	6	5.24	4.80	1.09	1.42	13.1	11.9	1.52	.264	5.06	123	5.64	137	8.88	-17.8
6	Hector Carrasco H. Carrasco	5	2005	WSH	4	.556	64	5	2.04	75	0	0	2	88.1	59	20	23	6	38	6	13	7	358	6	7.64	3.87	1.97	0.61	20.9	10.6	1.10	.227	2.34	50	3.69	90	6.01	4.2
7	Gary Majewski G. Majewski	4	2005	WSH	4	.500	79	0	2.93	50	0	0	1	86.0	80	28	32	2	37	7	24	6	376	1	5.23	3.87	1.35	0.21	13.3	9.8	1.36	.279	3.35	72	3.68	89	8.37	4.2
8	Tomo Ohka T. Ohka	4	2005	WSH	3	.571	10	9	3.33	17	0	0	0	54.0	44	20	23	6	27	1	0	1	231	3	2.83	4.50	0.63	1.00	7.4	11.7	1.31	.211	3.83	82	5.38	131	7.33	-7.9
9	Ryan Drese R. Drese	3	2005	WSH	6	.333	11	11	4.98	26	0	0	0	59.2	66	33	38	3	22	5	0	1	266	3	3.92	3.32	1.18	0.45	9.8	8.3	1.47	.300	5.73	123	4.15	101	9.96	-0.3
10	Jason Bergmann J. Bergmann	2	2005	WSH	0	1.000	15	1	2.75	21	0	0	0	19.2	14	6	6	1	11	2	4	1	85	0	9.61	5.03	1.91	0.46	24.7	12.9	1.27	.260	2.75	68	3.52	85	6.41	1.3
11	Chad Cordero C. Cordero	2	2005	WSH	4	.333	74	0	1.82	61	0	0	47	74.1	55	15	24	9	17	2	62	2	300	0	7.39	2.06	3.59	1.09	20.3	5.7	0.97	.218	2.91	45	3.71	90	6.66	3.4
12	Joey Eischen J. Eischen	2	2005	WSH	1	.667	57	0	3.22	30	0	0	0	36.1	34	13	14	1	19	6	14	7	168	5	7.43	4.71	1.58	0.25	17.9	11.3	1.46	.295	3.47	80	3.78	92	8.42	1.4
13	Jon Rauch J. Rauch	2	2005	WSH	4	.333	15	1	3.60	23	0	0	0	30.0	24	12	12	3	11	1	4	2	124	2	6.90	3.30	2.09	0.90	18.5	8.9	1.17	.244	3.60	89	3.98	97	7.20	0.5
14	Mike Stanton M. Stanton	2	2005	WSH	1	.667	30	0	3.58	14	0	0	0	27.2	31	11	13	2	9	0	6	4	118	0	4.55	2.93	1.56	0.65	11.9	7.6	1.45	.312	4.23	88	3.91	95	10.08	0.6
15	Zach Day Z. Day	1	2005	WSH	2	.333	12	5	6.75	16	0	0	0	36.0	41	27	29	4	25	1	4	3	170	1	4.00	6.25	0.64	1.00	9.4	14.7	1.83	.298	7.25	167	5.73	139	10.25	-6.7
16	Travis Hughes T. Hughes	1	2005	WSH	1	.500	14	0	5.54	8	0	0	0	13.0	18	8	8	4	8	1	0	1	64	0	5.54	5.54	1.00	2.77	12.5	12.5	2.00	.326	5.54	137	7.86	191	12.46	-5.6
17	Sun-Woo Kim S. Kim	1	2005	WSH	2	.333	12	2	6.14	17	0	0	0	29.1	41	20	20	3	8	2	3	2	135	1	5.22	2.45	2.13	0.92	12.6	5.9	1.67	.362	6.14	151	4.20	102	12.58	-0.3
18	T.J. Tucker	1	2005	WSH	0	1.000	13	0	6.39	5	0	0	0	12.2	20	9	9	4	2	0	1	0	58	1	3.55	1.42	2.50	2.84	8.6	3.4	1.74	.340	6.39	158	6.80	165	14.21	-3.9