Earlier this month, Stephen Strasburg left a start against the Cincinnati Reds in Great American Ball Park after just 5 u2153 innings pitched with cramping in his right calf.
Other than that, the 27-year-old, 2009 No. 1 overall pick has been healthy since last season, whe he returned from his second DL stint of the 2015 campaign.
He suffered an ankle sprain last Spring which he and the Nationals believe led to mechanical issues and back issues.
"We found out, we had an idea yesterday, but our trainers were working on him and they worked on him all day yesterday and they worked on him today.