Manager Matt Williams said Fister would be pushed back a couple of days until the inflammation subsides. He said the move was precautionary. An MRI exam Thursday revealed the inflammation.
The Nationals acquired Fister from the Detroit Tigers in the offseason.
Perez to join D'backs
Lefthander Oliver Perez and the Arizona Diamondbacks have agreed to a $4.25 million, two-year contract, a person familiar with the negotiations said.
The 32-year-old was 3-3 with a 3.74 ERA last year with the Seattle Mariners. He has a 62-75 record in 195 starts and 105 relief appearances over 11 seasons.
Carmen Berra dies at 85
The wife of New York Yankees great Yogi Berra died Thursday in a North Jersey assisted-living facility from complications of a stroke, the New York Daily News reported.
The Berras recently celebrated their 65th wedding anniversary.
Yogi Berra, 88, was a 10-time World Series champion with the Yankees as a catcher, had two stints as their manager, and is an unofficial team ambassador.
Carmen Berra was often seen at events at the Yogi Berra Museum & Learning Center on the campus of Montclair State University in Little Falls, N.J.
- Inquirer wire services