Djokovic beats back issue to blast past Norrie at US Open
Tomas Kauer - News Moderator 
Novak Djokovic stayed in the hunt for a record 25th Grand Slam trophy on Friday by quickly recovering from a lower back problem to beat unseeded Briton Cameron Norrie 6-4 6-7(4) 6-2 6-3 and reach the fourth round of the US Open.
