Djokovic leads Serbia against USA
World No. 1 Novak Djokovic, leading Serbia's Davis Cup quarter-final charge against the United States, will take on John Isner in the opening singles match of their World Group tie on Friday.
Djokovic is one of just two top-10 player, along with France's Jo-Wilfried Tsonga, who will be competing in the Davis Cup World Group quarter-finals this weekend.
In the absence of Serbian number two Janko Tipsarevic, enduring a dry spell on the ATP tour, world No. 44 Viktor Troicki will join Djokovic playing singles for Serbia, who lifted the trophy in the nations tennis competition in 2010.
Troicki will take on Sam Querrey in Friday's second singles in Boise, the capital of Idaho which is located at an altitude of 800m.
In Saturday's doubles, Bob and Mike Bryan will take on Nenad Zimonjic andIlija Bozoljac, while in Sunday's reverse singles in the best-of-five match tie Querrey will take on Djokovic and Isner will face Troicki.
USA v Serbia
Friday (19:30 GMT)
John Isner (USA) v Novak Djokovic (SRB)
Sam Querrey (USA) v Viktor Troicki (SRB)
Saturday (19:00 GMT)
Bob Bryan/Mike Bryan (USA) v Nenad Zimonjic/Ilija Bozoljac (SRB)
Sunday (18:00 GMT)
Sam Querrey (USA) v Novak Djokovic (SRB)
John Isner (USA) v Viktor Troicki (SRB)