The 2018 pitchers for the Nationals included Kyle Barraclough, James Bourque, Patrick Corbin, Tanner Rainey and Trevor Rosenthal.

	NO.	NAME	POS	HEIGHT	WEIGHT	DOB	AGE	BIRTHPLACE
1	70	Austin Adams A. Adams	P	6'2"	225	5/5/1991	27	Tampa, FL
2		Kyle Barraclough K. Barraclough	P	6'3"	225	5/23/1990	28	Santa Clara, CA
3		James Bourque J. Bourque	P	6'4"	190	7/9/1993	24	Ann Arbor, MI
4	22	A.J. Cole	P	6'5"	215	1/5/1992	26	Winter Springs, FL
5	55	Tim Collins T. Collins	P	5'7"	170	8/21/1989	28	Worcester, MA
6	46	Patrick Corbin P. Corbin	P	6'3"	210	7/19/1989	28	Clay, NY
7	52	Jimmy Cordero J. Cordero	P	6'3"	215	10/19/1991	26	San Cristobal, Dominican Republic
8	62	Sean Doolittle S. Doolittle	P	6'2"	210	9/26/1986	31	Rapid City, SD
9	23	Erick Fedde E. Fedde	P	6'4"	180	2/25/1993	25	Las Vegas, NV
10	30	Koda Glover K. Glover	P	6'5"	225	4/13/1993	25	Monroe, OK
11	47	Gio Gonzalez G. Gonzalez	P	6'0"	205	9/19/1985	32	Hialeah, FL
12	26	Trevor Gott T. Gott	P	6'0"	185	8/26/1992	25	Lexington, KY
13	33	Matt Grace M. Grace	P	6'4"	215	12/14/1988	29	Palos Verdes Estates, CA
14	58	Jeremy Hellickson J. Hellickson	P	6'1"	190	4/8/1987	31	Des Moines, IA
15	40	Kelvin Herrera K. Herrera	P	5'10"	200	12/31/1989	28	Tenares, Dominican Republic
16	56	Greg Holland G. Holland	P	5'10"	205	11/20/1985	32	Marion, NC
17	27	Shawn Kelley S. Kelley	P	6'2"	230	4/26/1984	34	Louisville, KY
18	21	Brandon Kintzler B. Kintzler	P	6'0"	190	8/1/1984	33	Las Vegas, NV
19	44	Ryan Madson R. Madson	P	6'6"	225	8/28/1980	37	Long Beach, CA
20	61	Kyle McGowin K. McGowin	P	6'3"	195	11/27/1991	26	Southampton, NY
21	60	Justin Miller J. Miller	P	6'3"	215	6/13/1987	31	Bakersfield, CA
22	46	Tommy Milone T. Milone	P	6'0"	220	2/16/1987	31	Saugus, CA
23		Tanner Rainey T. Rainey	P	6'2"	235	12/25/1992	25	Hammond, LA
24	57	Tanner Roark T. Roark	P	6'2"	235	10/5/1986	31	Wilmington, IL
25	68	Jefry Rodriguez J. Rodriguez	P	6'5"	185	7/26/1993	24	Haina, Dominican Republic