More than half of the approximately 11,500 tickets for the April 5-7 matchup between the United States and Serbia at Taco Bell Arena have been sold, according to the United States Tennis Association. Tickets were available through a presale Monday and Tuesday to USTA members, and went on sale to the public Wednesday. The top tier of seats, located courtside at $500 for a three-day pass, have been sold out. Tickets ranging from $90-$375 for a three-day pass are still available in four different price levels. Tickets can be purchased at idahotickets.com for the event, which is expected to include Serbia's Novak Djokovic, the world's No. 1-ranked player.