John Wall of the Washington Wizards signs autographs for fans after a USA Basketball mini camp practice, Monday, July 22, 2013, in Las Vegas. Twenty-eight of the best young players in the country are in Las Vegas for four days of workouts that essentially mark the kickoff of 2016 Olympic preparations. (AP Photo/Julie Jacobson)

Photo by: Julie Jacobson

John Wall of the Washington Wizards signs autographs for fans after a USA Basketball mini camp practice, Monday, July 22, 2013, in Las Vegas. Twenty-eight of the best young players in the country are in Las Vegas for four days of workouts that essentially mark the kickoff of 2016 Olympic preparations. (AP Photo/Julie Jacobson)