Nationals place Doug Fister on 15-day disabled list

Williams said Roark, who is slated to pitch the team's home opener Friday against the Braves, would throw a "heavy bullpen" on Saturday.

New Nationals' acquisition Doug Fister will begin the season on the 15-day disabled list :: Tom DiPace/SI

Williams said Roark, who is slated to pitch the team's home opener Friday against the Braves, would throw a "heavy bullpen" on Saturday.