UPDATE (11:30 PM EST): Unless Harper looks ready to play in next couple of days, he'll probably be shut down for season, according to CSN Washington's Mark Zuckerman.
UPDATE (10:57 PM EST): Adam Kilgore of the Washington Post says the official word on Harper is a right hamstring strain, and will be re-evaluated tomorrow.
UPDATE (10:49 PM EST): Will Carroll of Sports Illustrated reports Bryce Harper has a "significant" hamstring strain that will likely ends his season.
ORIGINAL REPORT: Basbeall's top prospect, outfielder Bryce Harper has suffered a leg injury while running the bases for the Washington Nationals Double-A affiliate. The former No. 1 overall pick of the 2010 draft had to be carried off the field by two team members with his leg fully extended.
CBS Sports Gregg Doyle writes Harper "was probably going to score from first on a long single when he pulled up just short of third base and hopped safely to the bag." Doyle adds the "injury wasn't immediately identified, and a Harrisburg official at the game declined to say when it would be." Doyle speculates Harper suffered an ankle or hamstring injury, hamstring being the less severe."
Nationals starting pitcher Stephen Strasburg, the No. 1 pick in 2009, is working his way back from Tommy John surgery. Now Harper, the No. 1 pick of 2010, suffering an injury but shouldn't be as severe.
We'll update this post as we find out more about the severity of Harper's injury.