Harper was trying to make a play on a ball hit by A.J. Ellis when he smacked face-first into the scoreboard. The impact sent his cap flying as he bounced off the wall and crumpled to the ground. Center fielder Denard Span had to come in to field the ball.
Harper rolled onto his back and eventually got up under his own power. Streaks of blood were evident on his neck as he walked off the field.
It was the right fielder's second game back after missing two games with an ingrown toenail.