Novak Djokovic beats Flushing Meadows in 6 sets in U.S. Open third round . Federer survives scare as Croatian takes second set at Flushing Meadows . But Czech ninth seed Tomas Berdych and Marcel Granollers , the 31st seed from Spain both had to quit their third round matches through injury . Top seed Roger Federer also reaches fourth round after beating Nikolay Davydenko . third seed Tomas Berdych forced to quit with a shoulder injury in New York .
Novak Djokovic beats Flushing Meadows in 6 sets in U.S. Open third round . Federer survives scare as Croatian takes second set at Flushing Meadows . Top seed Roger Federer also reaches fourth round after beating Nikolay Davydenko . third seed Tomas Berdych forced to quit with a shoulder injury in New York .