Roger Federer sailed through to fourth round in New York with a 6-4 6-3 6-3 win over Frenchman Paul-Henri Mathieu. Federer, 29, did not have to be at his best as he reached the last 16 in total control at Flushing Meadows.
Third seed Novak Djokovic proved too strong for crowd favourite James Blake as he secured a 6-1 7-6 (7-4) 6-3 win.
The pair were joined in the last 16 by Robin Soderling after the Swede eased past Thiemo de Bakker 6-2 6-3 6-3.
Second seed Federer revealed he had found the blustery conditions problematic on Arthur Ashe Stadium.