Doug Fister. (USA TODAY Sports)

The Nationals are riding a five-game winning streak, which matches the longest run of the season. They have a six-game division lead on the Braves without rattling off a bunch of wins in a row. Doug Fister (12-3, 2.34 ERA) takes the mound on Sunday with the chance to make it six in a row. Right-hander Edinson Volquez (10-7, 3.67 ERA) starts for the Pirates. The lineups are here. As always, discuss the game below.