Djokovic rallies from behind to beat Nishikori and reach US Open fourth round – See Video

Novak Djokovic had to come from behind to beat Kei Nishikori and keep his bid for a calendar Grand Slam alive as he advanced to the US Open fourth round.

The world number one overcame a loose first set to win 6-7, 6-3, 6-3, 6-2 and beat the Japanese for the 17th time in a row.

The 34-year-old Serb is aiming for a men’s record 21st Grand Slam title.

He will face American Jenson Brooksby next, after the wildcard beat Russian 21st seed Aslan Karatsev in five sets.