The Houston Astros were dealt a blow Wednesday when one of their outfielders hit the wall hard, and tried but failed to walk off the field on his own power.

Pittsburgh's top draft pick has been ruled out of tonight's preseason finale against Carolina. Here's what happened.

First-round pick Derrick Harmon was carted to the locker room. It’s unclear what caused his injury, as he was carted from the sideline. He went to the medical tent following an interception by James Pierre, and was taken to the locker room afterwards.