There were times during his Wimbledon semi-final that Novak Djokovic must have felt as if he was looking in a mirror. Elements of Jannik Sinner's game scream pure Djokovic - whether it's the sliding, the rally tolerance or the movement around the court. "We were watching a better version of Novak Djokovic playing himself," McEnroe said on BBC TV. For the first time, Djokovic looked as though he was feeling the 15-year difference between himself and Sinner. Being half a step slower than usual was enough for Sinner to pounce - just as Djokovic has done to opponents over the years.