Novak Djokovic vs Roger Federer in a five-set thriller! | US Open 2011 Semifinal

Novak Djokovic vs Roger Federer in a five-set thriller! | US Open 2011 Semifinal

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Novak Djokovic takes on Roger Federer in the semifinal of the US Open 2011. A four-hour, five-set thriller that will go down in history!

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