The Washington Nationals are acquiring left-handed reliever Sean Doolittle and right-handed reliever Ryan Madson from the Oakland Athletics for right-hander Blake Treinen and two prospects. The prospects headed to the Athletics are left-hander Jesus Luzardo and third baseman Sheldon Neuse. Treinen, 29, is 0-2 with a 5.73 ERA and two saves in 37 2/3 innings. Doolittle, 30, is 1-0 with a 3.38 ERA and three saves in 21 1/3 innings. Madson, 36, is 2-4 with a 2.06 ERA and one save in 39 1/3 innings.