The Nationals will look to win their second straight game after defeating the Phillies in 10 innings on Thursday night.
The rotation for both clubs will remain intact for the doubleheader, as left-handed pitcher Billy Traber will start Game 1 for Washington and right-hander Jason Bergmann will get the nod in 7:05 p.m. game.
Arizona will counter with former Expos right-hander Miguel Batista and former Nationals right-hander Livan Hernandez will start in the second game for the Diamondbacks.
WAS: LHP Billy Traber (3-3, 7.14 ERA)
He'll make his first career appearance against Arizona.
ARI: RHP Miguel Batista (10-5, 4.46 ERA)
He's 0-1 with a 4.26 ERA against Washington in his career.
WAS: RHP Jason Bergmann (0-1, 6.44 ERA)
He'll make his fourth start this season.
ARI: RHP Livan Hernandez (10-11, 5.27 ERA)
Will face the Nationals for the first time since being traded to the Diamondbacks.
Player to watch
Ryan Zimmerman brings a six-game hitting streak into the series opener.
Sunday: Diamondbacks (RHP Brandon Webb, 14-5, 3.02) at Nationals (RHP Tony Armas Jr., 8-10, 5.28), 1:05 p.m. ET
Monday: Cardinals (RHP Jason Marquis, 14-12, 5.86) at Nationals (RHP Ramon Ortiz, 9-12, 5.34), 1:05 p.m. ET
Tuesday: Cardinals (RHP Jeff Suppan, 14-12, 5.86) at Nationals (RHP Pedro Astacio, 3-4, 6.12), 7:05 p.m. ET
Bill Ladson is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.