Serbian secures win in his best performance of tournament but says his struggles with movement are ‘frustrating’

Novak Djokovic says he "did not feel that great" as he came back from a set down to beat American qualifier Zachary Svajda and reach the US Open third round.

Cameron Norrie defeated his Argentinian opponent in four sets and will face Novak Djokovic, who also had to play four sets against Zach Svajda