Bethanie Mattek-Sands SCREAMS for Help After Suffering Gruesome Wimbledon Injury

American player Bethanie Mattek-Sands, the Doubles World No. 1, had to be carried off the court on a stretcher with a right knee injury. Mattek-Sands injured the knee after she planted her right leg awkwardly while squaring up for a return volley. She has had multiple knee surgeries in the past, and multiple trainers were on the scene to help her.