The Nationals face a pivotal day in their season: win two, hope the Reds lose and they can gain 1 1/2 games in the standings. The Nationals sent Dan Haren (9-13, 4.68 ERA) home early during Saturday’s long rain delay, so he starts the first game of the doubleheader. He will be opposed by Tom Koehler (3-10, 4.51 ERA). The lineups are here. As always, discuss the game here.