Reigning champion Roger Federer booked a US Open quarter-final clash against Robin Soderling with a 7-5 6-2 6-2 win over Spaniard Tommy Robredo.
The world number one broke Robredo in the 11th game to clinch a tight first set before breaking twice more in a far more comfortable second.
An aggressive Federer wrapped up victory in the third set with an ace.
Novak Djokovic remains on course for a semi-final against Federer after beating Radek Stepanek 6-1 6-3 6-3.
Djokovic, seeded fourth,...
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