US player Jack Sock plays with a tribute to injured US player Bethanie Mattek-Sands written on his shoes on the fifth day of the 2017 Wimbledon Championships at The All England Lawn Tennis Club in Wimbledon, southwest London, on July 7, 2017. Bethanie Mattek-Sands was undergoing more tests on her right knee on July 7 following her sickening injury at Wimbledon which left her screaming. The 32-year-old American was being treated in a nearby private hospital where she was taken on Thursday after her knee appeared to buckle as she approached the net in her second round clash with Sorana Cirstea on Court 17. / AFP PHOTO / Daniel LEAL-OLIVAS / RESTRICTED TO EDITORIAL USE (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
