Bryce Harper is expected to bat third for the Nationals this season.
Johnny Cueto hung in tough in a low-scoring game against the Marlins on Thursday, limiting the opposition to one run over seven innings en route to his 12th win in the Reds' 3-1 victory.
Jason Vargas (appendectomy) will rejoin the Royals' rotation on Saturday in Oakland.
The Athletics are expected to keep Jason Hammel in their rotation over Jesse Chavez.
Tyler Skaggs exited Thursday's start against the Orioles with tightness in his left forearm.
Cliff Lee exited Thursday's start against the Nationals with a left flexor pronator strain.
Will Middlebrooks (finger) will be activated from the disabled list prior to Friday's game.
Starling Marte (concussion) will begin a rehab assignment with Triple-A Indianapolis on Saturday.
Rays acquired LHP Drew Smyly and SS Willy Adames from the Tigers in a three-team trade that sent LHP David Price to Detroit.
Shane Victorino is expected to be placed on the disabled list after aggravating his back injury.
Rays acquired SS Nick Franklin in a three-team trade that sent LHP David Price to the Tigers.
Tigers acquired LHP David Price in a three-team trade with the Rays and Mariners.