Serbia's Novak Djokovic, left, grabs the shoulders of teammate Viktor Troick as Troicki jokes about the popularity of Djokovic in Serbia and that he might be the future president of their country, Tuesday, April 2, 2013, at a Davis Cup tennis news conference Tuesday, April 2, 2013, in Boise, Idaho. Serbia and the United States meet in a Davis Cup tie this weekend. (AP Photo/Idaho Press-Tribune, Greg Kreller)

Associated Press
Serbia's Novak Djokovic, left, grabs the shoulders of teammate Viktor Troick as Troicki jokes about the popularity of Djokovic in Serbia and that he might be the future president of their country, Tuesday, April 2, 2013, at a Davis Cup tennis news conference Tuesday, April 2, 2013, in Boise, Idaho. Serbia and the United States meet in a Davis Cup tie this weekend. (AP Photo/Idaho Press-Tribune, Greg Kreller)
Serbia's Novak Djokovic, left, grabs the shoulders of teammate Viktor Troick as Troicki jokes about the popularity of Djokovic in Serbia and that he might be the future president of their country, Tuesday, April 2, 2013, at a Davis Cup tennis news conference Tuesday, April 2, 2013, in Boise, Idaho. Serbia and the United States meet in a Davis Cup tie this weekend. (AP Photo/Idaho Press-Tribune, Greg Kreller)
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