Harper checked his swing on one pitch and reacted as if he were in pain during what would be his final at-bat of the game in the top of the sixth inning. He didn't run all the way to first base on the grounder and left to speak with manager Davey Johnson and head athletic trainer Lee Kuntz.
Harper did not take the field in the bottom of the sixth inning and was replaced by Roger Bernadina.
Harper crashed into an outfield wall last night during the Nationals' 8-1 loss and has a bruise on his left side. Harper, 20, is hitting .337 with six doubles, a triple, nine homers and 18 RBI this season. He also leads the NL in multi-hit games (12), and was playing right field because of leg injuries to starting right fielder Jayson Werth.