Bethanie Mattek-Sands was stretchered off court screaming in pain after suffering an horrific knee injury during her women’s singles match at Wimbledon, while her opponent criticised the time taken to deal with the incident. Mattek-Sands, who suffered a serious ligament injury to the same knee four years ago, has won five grand slam doubles titles with Czech Lucie Safarova, who was crying courtside during the incident.