Djokovic, Nadal reach US Open round 4
Serbian world number one Novak Djokovic progressed to the fourth round of the US Open after his third round opponent Russia's Mikhail Youzhny was forced to retire after the sixth game of the first set. Spain's Rafael Nadal also progressed to the fourth round after defeating Russia's Andrey Kuznetsov 6-1, 6-4, 6-2 on Saturday.