BOISE, Idaho (AP) -- Serbia's doubles team remained unchanged for its matchup against the United States in a Davis Cup quarterfinal despite an offer to play from World No. 1 Novak Djokovic.
Serbian captain Bogdan Obradovic on Saturday kept to his original doubles lineup of Nenad Zimonjic, a former No. 1 doubles player and multiple Grand Slam winner, and Ilija Bozoljac, currently ranked No. 1,150 in doubles.
Bob and Mike Bryan, the No. 1 doubles team in the world, will play for the United States.
The U.S. and Serbia are tied 1-1 after Friday's first day of singles action.
Sunday's card features reverse singles matches with Djokovic playing Sam Querrey, followed by Viktor Troicki of Serbia versus John Isner.
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