Djokovic hits partner Federer in the back during doubles match

Novak Djokovic accidentally hit Roger Federer in the back during their first-ever doubles match as a team at Laver Cup on Friday. Playing against Team World's Jack Sock and Kevin Anderson, Team Europe's Djokovic hit a forehand on a return, which struck Federer, who had his back turned. "That was the first chance Djokovic had to get him," commentators joked.