Djokovic marches on in New York

New York - Defending champion Novak Djokovic of Serbia sailed into the quarter-finals of the US Open on Wednesday when fourth-round opponent Stanislas Wawrinka on Switzerland retired hurt.

Djokovic was in complete control of the match, leading 6-4, 6-1, 3-1 after an hour and a half on the Louis Armstrong Stadium court, when Wawrinka quit after getting medical help from his trainer at the change of ends.

Novak Djokovic of Serbia hits a return to Stanislas Wawrinka of Switzerland during their men's singles match at the US Open tennis tournament in New York. Credit: Reuters

Djokovic, who won the US Open for the first time last year, will play either American Andy Roddick or Argentine Juan Martin del Potro in Thursday's quarter-finals.

The world number two has not dropped a single set in the tournament so far. - Reuters

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