Ailing Djokovic pulls out of Davis Cup; Nadal rolls

BELGRADE, Serbia (AP) -- U.S. Open champion Novak Djokovic pulled out of Serbia's opening singles match against David Nalbandian of Argentina on Friday in the Davis Cup semifinals because of back pain.

Source: http://sportsillustrated.cnn.com/2011/tennis/09/16/davis-cup-semifinals.ap/index.html?xid=si_topstories

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