Serbian third seed Novak Djokovic has advanced to the US Open tennis quarter-finals by beating US 19th seed Mardy Fish in straight sets.
Djokovic, the 2008 Australian Open champion, will play for a semi-final berth against French 17th seed Gael Monfils, who ousted countryman Richard Gasquet in straight sets.
Monfils is 0-4 against Djokovic but pushed him to five sets in round one of the 2005 US Open, to three sets at the 2008 Beijing Olympic quarter-finals and a third-set tie-breaker before dropping last year's Paris indoor final.
Djokovic was the 2007 US Open runner-up and lost in the semi-finals the past two years, all three defeats coming to 16-time Grand Slam winner Roger Federer, a potential semi-final opponent again this year.
