Yordan Alvarez and Jeremy Pena collided in the outfield while chasing a pop-up during Wednesday afternoon's game against the Mets. Pena was able to leave the game under his own power whereas Alvarez could stand up but was eventually taken off the field on a cart. (Yahoo Sports on Twitter)
It appeared that Alvarez took a hard shot to his head/face during the collision, according to the video. We do not have any further information on their status at this time and will update as we learn more.