A match in Mexico ended in a scary way on Monday after one wrestler threw a concrete block at the head of his opponent, who was then hospitalized.

The match between Angel o Demonio and Cuervo occurred just outside of Mexico City and was promoted by Lucha Memes/Lucha Boom.

As seen in the video below … Demonio grabs a concrete block from the backstage area after being hit with multiple chair shots, then returns to the ring to throw it at his opponent from behind/above. Cuervo had no idea it was coming and got knocked unconscious.

A doctor then called off the match and helped Cuervo to the back when he came to. We’re told an ambulance was called and he was taken to the hospital.

During a post-match promo, Demonio apologized for Cuervo not being able to finish the match. He also went on Facebook to say he didn’t appreciate the multiple chair shots being doled out beforehand, but claims he wasn’t aiming to hit Cuervo in the head with the concrete block.

Watch the video below, but warning … it’s hard to watch.

UPDATE: Cuervo has since undergone successful surgery to remove a blood clot from his brain.