Philadelphia's ace will be out of the lineup for the same reason Michael Morse hasn't played this season.
Bryce Harper struck out with the bases loaded, and Edwin Jackson made a couple of key mistakes in the Nationals' 3-1 loss to the Marlins.
In their attempt to deal Anibal Sanchez a loss for the first time in 19 career starts against them, the Nationals came up short once again.
Chad Tracy, the majors' best pinch-hitter this season, will miss at least 6 to 8 weeks after having surgery on Thursday.
The Nationals have faced Anibal Sanchez 18 times over the last seven years and never beaten the Marlins right-hander. Tonight, they get chance No. 19.