Rey Mysterio reportedly suffered a knee injury at the Tuesday night tapings for SmackDown in Ontario, California.

During a Fatal 4 Way match with Jack Swagger, Kofi Kingston, and Mark Henry, it appeared Mysterio landed badly on his knee and immediately rolled out of the ring. He pulled his pants leg up, removed a knee brace that protects his left knee and appeared to be in a great deal of pain.

More as we get it.