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Bryce Harper jammed his left hand on an inside pitch yesterday.
Manager Davey Johnson said Harper's left thumb was swollen after he lined a fourth-inning slider from Detroit's Drew Smyly into right field for a single. He was pulled from the game for precautionary reasons.
Harper was scheduled to make the trip to Port St. Lucie and bat third in today's game against New York, but Johnson informed the 20-year-old outfielder this morning he was being held back in Viera.
"I scratched him," the manager said.
Johnson said he's not worried about the extent of the injury and said he expects Harper to return to the lineup tomorrow when the Nationals face the Braves.