United States' Bob Bryan volleys the ball near the net during a Davis Cup quarterfinal doubles match with his brother Mike Bryan against Serbia's Ilija Bozoljac and Nenad Zimonjic on Saturday, April 6, 2013, in Boise, Idaho. Zimonjic and Bozoljac won 7-6 (5), 7-6 (1), 5-7, 4-6, 15-13. (AP Photo/Idaho Press-Tribune, Adam Eschbach)

Photo by: Adam Eschbach

United States' Bob Bryan volleys the ball near the net during a Davis Cup quarterfinal doubles match with his brother Mike Bryan against Serbia's Ilija Bozoljac and Nenad Zimonjic on Saturday, April 6, 2013, in Boise, Idaho. Zimonjic and Bozoljac won 7-6 (5), 7-6 (1), 5-7, 4-6, 15-13. (AP Photo/Idaho Press-Tribune, Adam Eschbach)