Tanner Roark. (AP Photo/Matt Slocum)

Tanner Roark (11-7, 2.86 ERA) takes the mound on Friday night with the Nationals enjoying their biggest division lead of the season. The Pirates counter with right-handed sinker-baller Charlie Morton (5-11, 3.62 ERA). The Nationals have tossed 13 shutouts this season, matching their single-season record set in 2012. There are 42 games left. The lineups are here. As always, discuss the game below.