After being stretched to five sets in his fourth round match at the US Tennis Open, the defending champion Roger Federer will be keen to dispatch the Luxembourg qualifier Gilles Muller in double quick time in the first of two men's quarter-finals on day 11 in New York.
Likewise, the third seed Novak Djokovic has spent almost eight hours on court in his last two matches, so he'll want to avoid another exhausting outing when he takes on the 2003 champion and home favourite Andy Roddick later today.
