Rookie Tanner Roark will make his first career start Saturday night in Miami, with veteran Ross Ohlendorf moving to the Nationals' bullpen.
Bryce Harper finally admitted his left hip is "barking," so he got Wednesday off. The Nationals star also admitted he hasn't been 100 percent healthy since April.
Jordan Zimmermann seeks his NL-leading 16th win, trying to pitch the Nationals to a series win in Philly. Get live updates and analysis on Nats Insider.
Ian Desmond and Jayson Werth have been the biggest keys to the Nationals' winning week, as the team tries to mount a wild card chase.