Tanner Roark. (Photo by Jonathan Daniel/Getty Images)

UPDATE, 6:35 p.m.: The game will begin 10 minutes late as the grounds crew prepares the field following evening rain the forced batting practice indoors.

The Nationals look to extend their season-best eight-game winning streak against the lowly Diamondbacks. The longest winning streak is Nationals history is a 10-game run in 2005. Tanner Roark (12-7, 2.93 ERA) takes the mound and will be opposed by struggling right-hander Trevor Cahill (3-8, 4.68 ERA). The lineups are here. As always, discuss the game below.